CVE-2025-39964 crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

In the Linux kernel, the following vulnerability has been resolved: crypto: afalg - Disallow concurrent writes in afalgsendmsg Issuing two writes to the same afalg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencie...

CVE-2025-39964

In CVE-2025-39964, the Linux kernel’s crypto/af_alg implementation now disallows concurrent writes to the same af_alg socket. The root cause is a race in af_alg_sendmsg where two writes could interleave or corrupt internal state; a new ctx->write field enforces exclusive ownership for writing....