In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offset (*pos) was within the bounds of the existing stream data length (v_len). If *pos was greater than or equal to v_len, this could lead to an out-of-bounds memory write. This patch adds a check to ensure *pos is less than v_len before proceeding. If the condition fails, -EINVAL is returned.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/04c8a38c60346bb5a7c49b276de7233f703ce9cb cve-icon cve-icon
https://git.kernel.org/stable/c/0ca6df4f40cf4c32487944aaf48319cb6c25accc cve-icon cve-icon
https://git.kernel.org/stable/c/7f61da79df86fd140c7768e668ad846bfa7ec8e1 cve-icon cve-icon
https://git.kernel.org/stable/c/d62ba16563a86aae052f96d270b3b6f78fca154c cve-icon cve-icon
https://git.kernel.org/stable/c/e6356499fd216ed6343ae0363f4c9303f02c5034 cve-icon cve-icon
https://github.com/doyensec/KSMBD-CVE-2025-37947/blob/main/CVE-2025-37947.c cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025052059-CVE-2025-37947-8c07@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-37947 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-37947 cve-icon
History

Mon, 27 Oct 2025 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Mon, 14 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00045}

 epss

{'score': 0.00037}

Thu, 22 May 2025 02:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Tue, 20 May 2025 16:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offset (*pos) was within the bounds of the existing stream data length (v_len). If *pos was greater than or equal to v_len, this could lead to an out-of-bounds memory write. This patch adds a check to ensure *pos is less than v_len before proceeding. If the condition fails, -EINVAL is returned.
Title ksmbd: prevent out-of-bounds stream writes by validating *pos
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-05-20T16:01:43.788Z

Updated: 2025-10-27T13:24:22.880Z

Reserved: 2025-04-16T04:51:23.972Z

Link: CVE-2025-37947

cve-icon Vulnrichment

Updated: 2025-10-09T12:57:30.347Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-05-20T16:15:32.677

Modified: 2025-10-27T14:15:40.367

Link: CVE-2025-37947

cve-icon Redhat

Severity : Low

Publid Date: 2025-05-20T00:00:00Z

Links: CVE-2025-37947 - Bugzilla