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.
[POC] CVE-2025-39964 — CVE-2025-39964_EXP
CVE-2025-39964 EXP
PoC: linux-kernel-zero-day-mitigation-zero-downtime-kernel-defense-
Neutralizing CISA active Linux kernel CVEs (CVE-2025-39964, CVE-2026-53266, CVE-2025-39682) via modern eBPF, module disarmament, and containerd user namespaces.
PoC: CVE-2025-39964
Tracking CVE-2025-39964, the Linux kernel AF_ALG concurrent-write race
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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