CVE-2025-39682
Improper Check for Unusual or Exceptional Conditions 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/2902c3ebcca52ca845c03182000e8d71d3a5196f;
- git.kernel.org/stable/c/c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677;
- git.kernel.org/stable/c/3439c15ae91a517cf3c650ea15a8987699416ad9;
- git.kernel.org/stable/c/29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e;
- git.kernel.org/stable/c/62708b9452f8eb77513115b17c4f8d1a22ebf843
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
Linux Kernel contains an improper check for unusual or exceptional conditions vulnerability in the TLS receive path which allows a zero-length record retrieved from the rx_list to bypass the intended recvmsg() record-type handling, potentially causing subsequent TLS records to be processed using incorrect zero-copy and queuing assumptions. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.
More from Linux this year.
- CVE-2026-46300 Missing Initialization of a Variable, added
- CVE-2026-53266 Out-of-Bounds Write, added
- CVE-2025-39964 Race Condition, 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.