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CVE-2025-39964

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data…

Published Oct 13, 2025EPSS 1.36%

Overview

CVE-2025-39964 is a high-severity vulnerability. It was published on October 13, 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 - Disallow concurrent writes in af_alg_sendmsg

Issuing two writes to the same af_alg socket is bogus as the

data will be interleaved in an unpredictable fashion. Furthermore,

concurrent writes may create inconsistencies in the internal

socket state.

Disallow this by adding a new ctx->write field that indiciates

exclusive ownership for writing.

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/0f28c4adbc4a97437874c9b669fd7958a8c6d6ceRefgit.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285Refgit.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8Refgit.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042Refgit.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84Refgit.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3dRefgit.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9Refcert-portal.siemens.com/productcert/html/ssa-019113.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39964?

CVE-2025-39964 is a high-severity vulnerability. It was published on October 13, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39964?

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-2025-39964?

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-2025-39964?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39964 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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