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CVE-2025-39931

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a…

Published Oct 4, 2025CWE-908EPSS 0.17%

Overview

CVE-2025-39931 is a high-severity vulnerability. It was published on October 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

crypto: af_alg - Set merge to zero early in af_alg_sendmsg

If an error causes af_alg_sendmsg to abort, ctx->merge may contain

a garbage value from the previous loop. This may then trigger a

crash on the next entry into af_alg_sendmsg when it attempts to do

a merge that can't be done.

Fix this by setting ctx->merge to zero near the start of the loop.

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/045ee26aa3920a47ec46d7fcb302420bf01fd753Refgit.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71Refgit.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7Refgit.kernel.org/stable/c/28f6f37abca7c5c9eb3959c66310f1d4d98b8aafRefgit.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8aRefgit.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6fRefgit.kernel.org/stable/c/db2b42425dfbde4983b0c20fb7cfa05f70e6a745Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39931?

CVE-2025-39931 is a high-severity vulnerability. It was published on October 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39931?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39931?

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-2025-39931?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39931 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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