{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-4439", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-20T12:07:18.155Z", "datePublished": "2024-06-20T12:07:57.944Z", "dateUpdated": "2025-05-04T06:59:53.132Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T06:59:53.132Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisdn: cpai: check ctr->cnr to avoid array index out of bound\n\nThe cmtp_add_connection() would add a cmtp session to a controller\nand run a kernel thread to process cmtp.\n\n\t__module_get(THIS_MODULE);\n\tsession->task = kthread_run(cmtp_session, session, \"kcmtpd_ctr_%d\",\n\t\t\t\t\t\t\t\tsession->num);\n\nDuring this process, the kernel thread would call detach_capi_ctr()\nto detach a register controller. if the controller\nwas not attached yet, detach_capi_ctr() would\ntrigger an array-index-out-bounds bug.\n\n[ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in\ndrivers/isdn/capi/kcapi.c:483:21\n[ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]'\n[ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted\n5.15.0-rc2+ #8\n[ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX,\n1996), BIOS 1.14.0-2 04/01/2014\n[ 46.870107][ T6479] Call Trace:\n[ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d\n[ 46.870974][ T6479] ubsan_epilogue+0x5/0x40\n[ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48\n[ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0\n[ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0\n[ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60\n[ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120\n[ 46.874256][ T6479] kthread+0x147/0x170\n[ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40\n[ 46.875248][ T6479] ret_from_fork+0x1f/0x30\n[ 46.875773][ T6479]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/isdn/capi/kcapi.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e8b8de17e164c9f1b7777f1c6f99d05539000036", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "24219a977bfe3d658687e45615c70998acdbac5a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9b6b2db77bc3121fe435f1d4b56e34de443bec75", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7d91adc0ccb060ce564103315189466eb822cc6a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "285e9210b1fab96a11c0be3ed5cea9dd48b6ac54", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7f221ccbee4ec662e2292d490a43ce6c314c4594", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cc20226e218a2375d50dd9ac14fb4121b43375ff", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1f3e2e97c003f80c4b087092b225c8787ff91e4d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/isdn/capi/kcapi.c"], "versions": [{"version": "4.4.290", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.9.288", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.253", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.214", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.156", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.76", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.15", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.4.290"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.9.288"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.14.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.19.214"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.4.156"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.10.76"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.14.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036"}, {"url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a"}, {"url": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75"}, {"url": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a"}, {"url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54"}, {"url": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594"}, {"url": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff"}, {"url": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d"}], "title": "isdn: cpai: check ctr->cnr to avoid array index out of bound", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-20T14:46:11.140255Z", "id": "CVE-2021-4439", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-20T14:46:30.065Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:30:07.335Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:30:07.335Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-4439", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-20T14:46:11.140255Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-20T14:46:24.380Z"}}], "cna": {"title": "isdn: cpai: check ctr->cnr to avoid array index out of bound", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e8b8de17e164c9f1b7777f1c6f99d05539000036", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "24219a977bfe3d658687e45615c70998acdbac5a", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9b6b2db77bc3121fe435f1d4b56e34de443bec75", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7d91adc0ccb060ce564103315189466eb822cc6a", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "285e9210b1fab96a11c0be3ed5cea9dd48b6ac54", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7f221ccbee4ec662e2292d490a43ce6c314c4594", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cc20226e218a2375d50dd9ac14fb4121b43375ff", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1f3e2e97c003f80c4b087092b225c8787ff91e4d", "versionType": "git"}], "programFiles": ["drivers/isdn/capi/kcapi.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "unaffected", "version": "4.4.290", "versionType": "semver", "lessThanOrEqual": "4.4.*"}, {"status": "unaffected", "version": "4.9.288", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.253", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.214", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.156", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.76", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.14.15", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/isdn/capi/kcapi.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036"}, {"url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a"}, {"url": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75"}, {"url": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a"}, {"url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54"}, {"url": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594"}, {"url": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff"}, {"url": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisdn: cpai: check ctr->cnr to avoid array index out of bound\n\nThe cmtp_add_connection() would add a cmtp session to a controller\nand run a kernel thread to process cmtp.\n\n\t__module_get(THIS_MODULE);\n\tsession->task = kthread_run(cmtp_session, session, \"kcmtpd_ctr_%d\",\n\t\t\t\t\t\t\t\tsession->num);\n\nDuring this process, the kernel thread would call detach_capi_ctr()\nto detach a register controller. if the controller\nwas not attached yet, detach_capi_ctr() would\ntrigger an array-index-out-bounds bug.\n\n[ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in\ndrivers/isdn/capi/kcapi.c:483:21\n[ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]'\n[ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted\n5.15.0-rc2+ #8\n[ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX,\n1996), BIOS 1.14.0-2 04/01/2014\n[ 46.870107][ T6479] Call Trace:\n[ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d\n[ 46.870974][ T6479] ubsan_epilogue+0x5/0x40\n[ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48\n[ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0\n[ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0\n[ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60\n[ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120\n[ 46.874256][ T6479] kthread+0x147/0x170\n[ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40\n[ 46.875248][ T6479] ret_from_fork+0x1f/0x30\n[ 46.875773][ T6479]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.4.290"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.9.288"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.14.253"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.214"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.156"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.76"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T06:59:53.132Z"}}}, "cveMetadata": {"cveId": "CVE-2021-4439", "state": "PUBLISHED", "dateUpdated": "2025-05-04T06:59:53.132Z", "dateReserved": "2024-06-20T12:07:18.155Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-06-20T12:07:57.944Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C56A8089-600C-4D13-B0BD-0B3B87CAAAEC", "versionEndExcluding": "4.4.290", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F99C0BFE-2803-4525-BA2B-EA4F42F8CADE", "versionEndExcluding": "4.9.288", "versionStartIncluding": "4.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1830428A-CB40-4E7F-A4F9-177A0B9614D2", "versionEndExcluding": "4.14.253", "versionStartIncluding": "4.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8491C8F9-93D0-4314-BD59-65E3038494EA", "versionEndExcluding": "4.19.214", "versionStartIncluding": "4.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "03015A9C-56AA-4210-9491-CF2FB0F45B9A", "versionEndExcluding": "5.4.156", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E61528CE-9083-425B-AE36-3791232BF780", "versionEndExcluding": "5.10.76", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "63BD46C4-473F-45F9-93E9-F67D955321D8", "versionEndExcluding": "5.14.15", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*", "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*", "matchCriteriaId": "0460DA88-8FE1-46A2-9DDA-1F1ABA552E71", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*", "matchCriteriaId": "AF55383D-4DF2-45DC-93F7-571F4F978EAB", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*", "matchCriteriaId": "9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisdn: cpai: check ctr->cnr to avoid array index out of bound\n\nThe cmtp_add_connection() would add a cmtp session to a controller\nand run a kernel thread to process cmtp.\n\n\t__module_get(THIS_MODULE);\n\tsession->task = kthread_run(cmtp_session, session, \"kcmtpd_ctr_%d\",\n\t\t\t\t\t\t\t\tsession->num);\n\nDuring this process, the kernel thread would call detach_capi_ctr()\nto detach a register controller. if the controller\nwas not attached yet, detach_capi_ctr() would\ntrigger an array-index-out-bounds bug.\n\n[ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in\ndrivers/isdn/capi/kcapi.c:483:21\n[ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]'\n[ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted\n5.15.0-rc2+ #8\n[ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX,\n1996), BIOS 1.14.0-2 04/01/2014\n[ 46.870107][ T6479] Call Trace:\n[ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d\n[ 46.870974][ T6479] ubsan_epilogue+0x5/0x40\n[ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48\n[ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0\n[ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0\n[ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60\n[ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120\n[ 46.874256][ T6479] kthread+0x147/0x170\n[ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40\n[ 46.875248][ T6479] ret_from_fork+0x1f/0x30\n[ 46.875773][ T6479]"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: isdn: cpai: verifique ctr->cnr para evitar que el \u00edndice de matriz est\u00e9 fuera de l\u00edmite. cmtp_add_connection() agregar\u00eda una sesi\u00f3n cmtp a un controlador y ejecutar\u00eda un subproceso del kernel para procesar cmtp. __module_get(ESTE_M\u00d3DULO); sesi\u00f3n->tarea = kthread_run(cmtp_session, sesi\u00f3n, \"kcmtpd_ctr_%d\", sesi\u00f3n->num); Durante este proceso, el hilo del n\u00facleo llamar\u00eda a detach_capi_ctr() para desconectar un controlador de registro. Si el controlador a\u00fan no estaba conectado, detach_capi_ctr() desencadenar\u00eda un error de los l\u00edmites de \u00edndice de matriz. [ 46.866069][ T6479] UBSAN: \u00edndice de matriz fuera de los l\u00edmites en drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] el \u00edndice -1 est\u00e1 fuera de rango para el tipo 'capi_ctr *[ 32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 No contaminado 5.15.0-rc2+ #8 [ 46.869002][ T6479] Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14. 0-2 01/04/2014 [ 46.870107][ T6479] Seguimiento de llamadas: [ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479] ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479 ] __ubsan_handle_out_of_bounds.cold+0x43 /0x48 [ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479] ret_from_fork+0x1f/0x30 [ 46.875773][ T6479]"}], "id": "CVE-2021-4439", "lastModified": "2024-11-21T06:37:44.080", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-06-20T12:15:10.447", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: isdn: cpai: check ctr->cnr to avoid array index out of bound", "id": "2293302", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293302"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nisdn: cpai: check ctr->cnr to avoid array index out of bound\nThe cmtp_add_connection() would add a cmtp session to a controller\nand run a kernel thread to process cmtp.\n__module_get(THIS_MODULE);\nsession->task = kthread_run(cmtp_session, session, \"kcmtpd_ctr_%d\",\nsession->num);\nDuring this process, the kernel thread would call detach_capi_ctr()\nto detach a register controller. if the controller\nwas not attached yet, detach_capi_ctr() would\ntrigger an array-index-out-bounds bug.\n[ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in\ndrivers/isdn/capi/kcapi.c:483:21\n[ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]'\n[ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted\n5.15.0-rc2+ #8\n[ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX,\n1996), BIOS 1.14.0-2 04/01/2014\n[ 46.870107][ T6479] Call Trace:\n[ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d\n[ 46.870974][ T6479] ubsan_epilogue+0x5/0x40\n[ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48\n[ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0\n[ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0\n[ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60\n[ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120\n[ 46.874256][ T6479] kthread+0x147/0x170\n[ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40\n[ 46.875248][ T6479] ret_from_fork+0x1f/0x30\n[ 46.875773][ T6479]"], "name": "CVE-2021-4439", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-4439\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-4439\nhttps://lore.kernel.org/linux-cve-announce/2024062001-CVE-2021-4439-59ce@gregkh/T"], "threat_severity": "Low"}