{"id":"CVE-2025-39964","aliases":[],"url":"https://o3.security/vulnerability/CVE-2025-39964","summary":"crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - Disallow concurrent writes in af_alg_sendmsg\n\nIssuing two writes to the same af_alg socket is bogus as the\ndata will be interleaved in an unpredictable fashion.  Furthermore,\nconcurrent writes may create inconsistencies in the internal\nsocket state.\n\nDisallow this by adding a new ctx->write field that indiciates\nexclusive ownership for writing.","published":"2025-10-13T13:48:30.334Z","modified":"2026-09-18T10:11:32.868118431Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.245"}],"fix":null,"references":[{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39964.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39964"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-18T10:11:32.868118431Z"}}