{"schema_version":"1.7.5","id":"CVE-2025-39964","published":"2025-10-13T13:48:30.334Z","modified":"2026-07-16T03:30:55.046417361Z","related":["SUSE-SU-2026:0962-1","SUSE-SU-2026:1041-1","SUSE-SU-2026:1078-1","SUSE-SU-2026:1081-1","SUSE-SU-2026:20667-1","SUSE-SU-2026:20720-1","SUSE-SU-2026:20838-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20873-1","SUSE-SU-2026:20876-1","SUSE-SU-2026:20931-1","SUSE-SU-2026:21284-1","openSUSE-SU-2026:20416-1"],"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2"},{"fixed":"0f28c4adbc4a97437874c9b669fd7958a8c6d6ce"},{"fixed":"e4c1ec11132ec466f7362a95f36a506ce4dc08c9"},{"fixed":"1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8"},{"fixed":"7c4491b5644e3a3708f3dbd7591be0a570135b84"},{"fixed":"9aee87da5572b3a14075f501752e209801160d3d"},{"fixed":"45bcf60fe49b37daab1acee57b27211ad1574042"},{"fixed":"1b34cbbf4f011a121ef7b2d7d6e6920a036d5285"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39964.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.38"},{"fixed":"5.10.245"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.194"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.154"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.108"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.49"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.16.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39964.json"}}],"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"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39964.json"}}