CVE-2025-39964
HIGH severity · CVSS 7.8 · CWE-362 · actively exploited (CISA KEV)
7.8CVSS HIGH exploited
Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2026-09-18. US federal agencies must patch by 2026-09-21.
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6cePatch
- https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285Patch
- https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8Patch
- https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042Patch
- https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84Patch
- https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3dPatch
- https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlAdvisory