THREAT OPS › CVEs › CVE-2025-39682
CVE-2025-39682 — Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
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.
Vulnerability details
- Affected productsKernel
- KEV remediation due2026-09-21
Related reporting
- CISA Flags Three Linux Kernel Vulnerabilities Exploited in the Wildthehackernews
- CISA Adds One Known Exploited Vulnerability to Catalogcisa_advisories
- [CISA KEV] CVE-2025-39682 — Linux Kernel: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerabilitycisa_kev
- [NVD] CVE-2025-39682 (CRITICAL 9.8) — In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different typenvd