CVE-2025-39964

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

CVSS 7.8 high · Linux Linux · published 2025-10-13

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

NVD · CVE.org

Coverage 1 source

1. 2026-09-18 CISA Cybersecurity Advisories critical CISA Adds Two Known Exploited Vulnerabilities to Catalog

   CISA added two Linux kernel vulnerabilities to its Known Exploited Vulnerabilities Catalog.

Mentioned with

CVE-2026-53266

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