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CVE-2025-21691

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: cachestat: fix page cache statistics permission checking When the 'cachestat()' system call was added in commit cf264e1329fb ("…

Published Feb 10, 2025EPSS 0.20%

Overview

CVE-2025-21691 is a medium-severity vulnerability. It was published on February 10, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

cachestat: fix page cache statistics permission checking

When the 'cachestat()' system call was added in commit cf264e1329fb

("cachestat: implement cachestat syscall"), it was meant to be a much

more convenient (and performant) version of mincore() that didn't need

mapping things into the user virtual address space in order to work.

But it ended up missing the "check for writability or ownership" fix for

mincore(), done in commit 134fca9063ad ("mm/mincore.c: make mincore()

more conservative").

This just adds equivalent logic to 'cachestat()', modified for the file

context (rather than vma).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/5f537664e705b0bf8b7e329861f20128534f6a83Refgit.kernel.org/stable/c/780ab8329672464984cf1344bd5c3993af0226c7Refgit.kernel.org/stable/c/7d6405c13b0d8a8367cd8df63f118b619a3f0dd2Refgit.kernel.org/stable/c/97153a05077f618f7471f50a78158602badccb30

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21691?

CVE-2025-21691 is a medium-severity vulnerability. It was published on February 10, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21691?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21691?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21691?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21691 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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