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Debian Linux CVE-2025-37947

HIGH
Out-of-bounds Write (CWE-787)
2025-05-20 416baaa9-dc9f-4396-8d5f-8c081fb06d67
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 17, 2026 - 20:45 vuln.today
Patch released
Mar 17, 2026 - 20:45 nvd
Patch available
CVE Published
May 20, 2025 - 16:15 nvd
HIGH 7.8

DescriptionCVE.org

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.

AnalysisAI

A boundary validation vulnerability in the Linux kernel's ksmbd (in-kernel SMB server) allows authenticated local users to perform out-of-bounds memory writes when handling stream data operations. The flaw occurs when write offsets exceed existing stream data boundaries, potentially leading to memory corruption with high impact on system confidentiality, integrity, and availability (CVSS 7.8). A proof-of-concept exploit is publicly available on GitHub, though real-world exploitation probability remains low at 0.03% according to EPSS data.

Technical ContextAI

The vulnerability affects ksmbd, the Linux kernel's built-in SMB/CIFS server implementation that allows Linux systems to serve files to Windows clients. The flaw resides in the ksmbd_vfs_stream_write() function which failed to validate whether the write offset position (*pos) was within bounds of the existing stream data length (v_len). This represents a classic CWE-787 out-of-bounds write vulnerability where boundary checks are missing before memory operations. Based on CPE data, the vulnerability affects Linux kernel versions up through 6.15-rc5 across multiple branches, including the stable 5.15.x, 6.1.x, 6.6.x, and 6.11.x series, as well as Debian Linux 11.0.

RemediationAI

Update the Linux kernel to the patched versions: 5.15.177 or later for the 5.15.x branch, 6.1.123 or later for 6.1.x, 6.6.69 or later for 6.6.x, or 6.11.12 or later for 6.11.x. Debian 11 users should apply the update referenced in the Debian LTS announcement at https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html. As a temporary mitigation, disable ksmbd if SMB file sharing is not required, or restrict local access to trusted users only. The vendor patches are available through the kernel.org Git repositories linked in the references.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2025-37947 vulnerability details – vuln.today

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