CVE-2025-39682: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
Summary
A vulnerability in the Linux Kernel's TLS receive path, identified as CVE-2025-39682, allows a zero-length record to bypass intended handling, potentially leading to incorrect processing of subsequent TLS records. The advisory warns that impacted products may be end-of-life and advises users to transition to supported versions and apply vendor mitigations.
IFF Assessment
This vulnerability allows for improper handling of TLS records, which could be exploited to bypass security controls and potentially lead to further compromise.
Severity
CISA KEV: Listed as actively exploited. Federal patch due: September 21, 2026. Known ransomware use: Unknown.
Defender Context
This vulnerability in the Linux Kernel's TLS receive path is critical for defenders to understand as it affects a core networking component. Organizations should prioritize patching or migrating from end-of-life systems to prevent potential exploitation, which could compromise TLS communications and enable further attacks.