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

CVE ID : CVE-2025-39964

Published : Oct. 13, 2025, 2:15 p.m. | 24 minutes ago

Description : 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.

Severity: 0.0 | NA

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