CVE-2025-37844: debian linux Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: avoid NULL pointer dereference in dbg call cifs_server_dbg() implies server to be non-NULL so move call under condition to avoid NULL pointer dereference. Found by Linux Verification Center (linuxtesting.org) with SVACE.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.6.7 — 5.10.237
linux	linux_kernel	5.11 — 5.15.181
linux	linux_kernel	5.16 — 6.1.135
linux	linux_kernel	6.2 — 6.6.88
linux	linux_kernel	6.7 — 6.12.24
linux	linux_kernel	6.13 — 6.13.12
linux	linux_kernel	6.14 — 6.14.3
debian	debian_linux	All

References

Advisories & Patches

https://git.kernel.org/stable/c/20048e658652e731f5cadf4a695925e570ca0ff9 https://git.kernel.org/stable/c/6c14ee6af8f1f188b668afd6d003f7516a507b08 https://git.kernel.org/stable/c/864ba5c651b03830f36f0906c21af05b15c1aaa6 https://git.kernel.org/stable/c/9c9000cb91b986eb7f75835340c67857ab97c09b https://git.kernel.org/stable/c/b2a1833e1c63e2585867ebeaf4dd41494dcede4b https://git.kernel.org/stable/c/b4885bd5935bb26f0a414ad55679a372e53f9b9b https://git.kernel.org/stable/c/ba3ce6c60cd5db258687dfeba9fc608f5e7cadf3 https://git.kernel.org/stable/c/e0717385f5c51e290c2cd2ad4699a778316b5132

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Frequently Asked Questions

What is CVE-2025-37844? +

In the Linux kernel, the following vulnerability has been resolved: cifs: avoid NULL pointer dereference in dbg call cifs_server_dbg() implies server to be non-NULL so move call under condition to avoid NULL pointer dereference. Found by Linux Verification Center (linuxtesting.org) with SVACE. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-37844? +

CVE-2025-37844 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-37844? +

CVE-2025-37844 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-37844? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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