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CVE-2025-21694

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the nu…

Published Feb 12, 2025EPSS 0.24%

Overview

CVE-2025-21694 is a medium-severity vulnerability. It was published on February 12, 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:

fs/proc: fix softlockup in __read_vmcore (part 2)

Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the

number of softlockups in __read_vmcore at kdump time have gone down, but

they still happen sometimes.

In a memory constrained environment like the kdump image, a softlockup is

not just a harmless message, but it can interfere with things like RCU

freeing memory, causing the crashdump to get stuck.

The second loop in __read_vmcore has a lot more opportunities for natural

sleep points, like scheduling out while waiting for a data write to

happen, but apparently that is not always enough.

Add a cond_resched() to the second loop in __read_vmcore to (hopefully)

get rid of the softlockups.

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/649b266606bc413407ce315f710c8ce8a88ee30aRefgit.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836Refgit.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87Refgit.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713Refgit.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2Refgit.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958Refgit.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952Reflists.debian.org/debian-lts-announce/2025/03/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.htmlRefcert-portal.siemens.com/productcert/html/ssa-265688.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21694?

CVE-2025-21694 is a medium-severity vulnerability. It was published on February 12, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21694?

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-2025-21694?

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-2025-21694?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21694 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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