CVE-2025-39964
Race Condition in Linux Kernel. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 18 September 2026.
- Product
- Linux Kernel
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce;
- git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9;
- git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8;
- git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84;
- git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d;
- git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042;
- git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
Linux Kernel contains a race condition vulnerability which allows concurrent writes to the same AF_ALG socket causing data to be unpredictably interleaved and creating inconsistencies in the socket's internal state.
More from Linux this year.
- CVE-2026-46300 Missing Initialization of a Variable, added
- CVE-2026-53266 Out-of-Bounds Write, added
- CVE-2025-39682 Improper Check for Unusual or Exceptional Conditions, added
- CVE-2026-53362 Unspecified, added
- CVE-2022-0995 Out-of-Bounds Write, added
- CVE-2022-0492 Improper Authentication, added
- CVE-2026-31431 Incorrect Resource Transfer Between Spheres, added
- CVE-2018-14634 Integer Overflow, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.