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The function\ntasklet_action_common calls tasklet_trylock, then it calls the tasklet\ncallback and then it calls tasklet_unlock. If the tasklet callback frees\nthe structure that contains the tasklet or if it calls some code that may\nfree it, tasklet_unlock will write into free memory.\n\nThe commits 8e14f610159d and d9a02e016aaf try to fix it for dm-crypt, but\nit is not a sufficient fix and the data corruption can still happen [1].\nThere is no fix for dm-verity and dm-verity will write into free memory\nwith every tasklet-processed bio.\n\nThere will be atomic workqueues implemented in the kernel 6.9 [2]. They\nwill have better interface and they will not suffer from the memory\ncorruption problem.\n\nBut we need something that stops the memory corruption now and that can be\nbackported to the stable kernels. So, I'm proposing this commit that\ndisables tasklets in both dm-crypt and dm-verity. This commit doesn't\nremove the tasklet support, because the tasklet code will be reused when\natomic workqueues will be implemented.\n\n[1] https://lore.kernel.org/all/d390d7ee-f142-44d3-822a-87949e14608b@suse.de/T/\n[2] https://lore.kernel.org/lkml/20240130091300.2968534-1-tj@kernel.org/"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm-crypt, dm-verity: deshabilitar tasklets Los tasklets tienen un problema inherente con la corrupci\u00f3n de la memoria. La funci\u00f3n tasklet_action_common llama a tasklet_trylock, luego llama a la devoluci\u00f3n de llamada del tasklet y luego llama a tasklet_unlock. Si la devoluci\u00f3n de llamada del tasklet libera la estructura que contiene el tasklet o si llama a alg\u00fan c\u00f3digo que pueda liberarlo, tasklet_unlock escribir\u00e1 en la memoria libre. Las confirmaciones 8e14f610159d y d9a02e016aaf intentan solucionarlo para dm-crypt, pero no es una soluci\u00f3n suficiente y la corrupci\u00f3n de datos a\u00fan puede ocurrir [1]. No hay ninguna soluci\u00f3n para dm-verity y dm-verity escribir\u00e1 en la memoria libre con cada biograf\u00eda procesada por tasklet. Habr\u00e1 colas de trabajo at\u00f3micas implementadas en el kernel 6.9 [2]. Tendr\u00e1n una mejor interfaz y no sufrir\u00e1n el problema de corrupci\u00f3n de memoria. Pero necesitamos algo que detenga la corrupci\u00f3n de la memoria ahora y que pueda ser compatible con los n\u00facleos estables. Entonces, propongo esta confirmaci\u00f3n que deshabilita los tasklets tanto en dm-crypt como en dm-verity. Esta confirmaci\u00f3n no elimina la compatibilidad con el tasklet, porque el c\u00f3digo del tasklet se reutilizar\u00e1 cuando se implementen las colas de trabajo at\u00f3micas. [1] https://lore.kernel.org/all/d390d7ee-f142-44d3-822a-87949e14608b@suse.de/T/ [2] https://lore.kernel.org/lkml/20240130091300.2968534-1- tj@kernel.org/"}], "id": "CVE-2024-26718", "lastModified": "2025-03-17T16:01:17.667", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-04-03T15:15:53.897", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b825e0f9d68c178072bffd32dd34c39e3d2d597a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dm-crypt, dm-verity: disable tasklets", "id": "2273146", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273146"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-123", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndm-crypt, dm-verity: disable tasklets\nTasklets have an inherent problem with memory corruption. The function\ntasklet_action_common calls tasklet_trylock, then it calls the tasklet\ncallback and then it calls tasklet_unlock. If the tasklet callback frees\nthe structure that contains the tasklet or if it calls some code that may\nfree it, tasklet_unlock will write into free memory.\nThe commits 8e14f610159d and d9a02e016aaf try to fix it for dm-crypt, but\nit is not a sufficient fix and the data corruption can still happen [1].\nThere is no fix for dm-verity and dm-verity will write into free memory\nwith every tasklet-processed bio.\nThere will be atomic workqueues implemented in the kernel 6.9 [2]. They\nwill have better interface and they will not suffer from the memory\ncorruption problem.\nBut we need something that stops the memory corruption now and that can be\nbackported to the stable kernels. So, I'm proposing this commit that\ndisables tasklets in both dm-crypt and dm-verity. This commit doesn't\nremove the tasklet support, because the tasklet code will be reused when\natomic workqueues will be implemented.\n[1] https://lore.kernel.org/all/d390d7ee-f142-44d3-822a-87949e14608b@suse.de/T/\n[2] https://lore.kernel.org/lkml/20240130091300.2968534-1-tj@kernel.org/"], "name": "CVE-2024-26718", "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": "2024-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26718\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26718\nhttps://lore.kernel.org/linux-cve-announce/2024040344-CVE-2024-26718-7259@gregkh/T"], "threat_severity": "Low"}