{"id":"CVE-2025-39931","revision":null,"records":[{"revision":"cba070d2b61743a4b3ab4f76f208435c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-39931","aliases":[],"title":"crypto: af_alg - Set merge to zero early in af_alg_sendmsg","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - Set merge to zero early in af_alg_sendmsg\n\nIf an error causes af_alg_sendmsg to abort, ctx->merge may contain\na garbage value from the previous loop. This may then trigger a\ncrash on the next entry into af_alg_sendmsg when it attempts to do\na merge that can't be done.\n\nFix this by setting ctx->merge to zero near the start of the loop.","state":0,"publishedAt":"2025-10-04T07:30:55.964+00:00","modifiedAt":"2026-10-15T22:02:33.324+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 ],\n \"versions\": [\n {\n \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n \"lessThan\": \"28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n \"lessThan\": \"db2b42425dfbde4983b0c20fb7cfa05f70e6a745\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n \"lessThan\": \"6241b9e2809b12da9130894cf5beddf088dc1b8a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n \"lessThan\": \"2374c11189ef704a3e4863646369f1b8e6a27d71\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n \"lessThan\": \"24c1106504c625fabd3b7229611af617b4c27ac7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n \"lessThan\": \"045ee26aa3920a47ec46d7fcb302420bf01fd753\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8ff590903d5fc7f5a0a988c38267a3d08e6393a2\",\n \"lessThan\": \"9574b2330dbd2b5459b74d3b5e9619d39299fc6f\",\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 ],\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\": \"5.10.260\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.211\",\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/28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf","https://git.kernel.org/stable/c/db2b42425dfbde4983b0c20fb7cfa05f70e6a745","https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a","https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71","https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7","https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753","https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39931","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-39931","identifiers":["CVE-2025-39931"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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