Linux Kernel: Linux Kernel Race Condition Vulnerability
› Linux Kernel
Get an email when a new major security incident drops. No spam, unsubscribe any time.
- started
- Sep 18, 2026
- closed
- Sep 18, 2026
- CVEs
- 3
- sources
- 6
## summary
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. CISA added CVE-2025-39964, CVE-2026-53266, CVE-2025-39682 to the Known Exploited Vulnerabilities catalog on 2026-09-18 based on evidence of active exploitation.
severity: Actively exploited (CISA KEV)
## cve ids[3]
## affected
- See vendor advisory / CISA notes (versions not always listed in KEV feed)
## fixed in
- See vendor advisory linked in sources
## timeline[1]
CISA added CVE-2025-39964, CVE-2026-53266, CVE-2025-39682 to the KEV catalog (due 2026-09-21).
## advisories[3]
## news & write-ups[3]
## notes & caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).
