{"id":"CVE-2025-39964","revision":"b6914a1b91c64a9886916e8e4be27d36","records":[{"revision":"b6914a1b91c64a9886916e8e4be27d36","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-39964","aliases":[],"title":"crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg","description":"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.","state":0,"publishedAt":"2025-10-13T13:48:30.334+00:00","modifiedAt":"2026-10-15T01:08:42.257+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"crypto/af_alg.c\",\n                        \"include/crypto/if_alg.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n                            \"lessThan\": \"0f28c4adbc4a97437874c9b669fd7958a8c6d6ce\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n                            \"lessThan\": \"e4c1ec11132ec466f7362a95f36a506ce4dc08c9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n                            \"lessThan\": \"1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n                            \"lessThan\": \"7c4491b5644e3a3708f3dbd7591be0a570135b84\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n                            \"lessThan\": \"9aee87da5572b3a14075f501752e209801160d3d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n                            \"lessThan\": \"45bcf60fe49b37daab1acee57b27211ad1574042\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n                            \"lessThan\": \"1b34cbbf4f011a121ef7b2d7d6e6920a036d5285\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"crypto/af_alg.c\",\n                        \"include/crypto/if_alg.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.38\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.38\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.245\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.194\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.154\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.108\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.49\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.16.9\",\n                            \"lessThanOrEqual\": \"6.16.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.17\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce","https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9","https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8","https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84","https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d","https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042","https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39964","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-39964","identifiers":["CVE-2025-39964"]},"retained":false,"historicalAffected":[]}],"coverage":[]}