{"id":"CVE-2026-64046","revision":"ccb46675399f40e69bf3015e4a759f1b","records":[{"revision":"ccb46675399f40e69bf3015e4a759f1b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64046","aliases":[],"title":"net: tls: prevent chain-after-chain in plain text SG","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: prevent chain-after-chain in plain text SG\n\nSashiko points out that if end = 0 (start != 0) the current\ncode will create a chain link to content type right after\nthe wrap link:\n\n This would create a chain where the wrap link points directly\n to another chain link. The scatterlist API sg_next iterator\n does not recursively resolve consecutive chain links.\n\nmeaning this is illegal input to crypto.\n\nThe wrapping link is unnecessary if end = 0. end is the entry after\nthe last one used so end = 0 means there's nothing pushed after\nthe wrap:\n\n end start i\n v v v\n [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap]\n\nSkip the wrapping in this case.\n\nTLS 1.3 can use the \"wrapping slot\" for it's chaining if end = 0.\nThis avoids the chain-after-chain.\n\nMove the wrap chaining before marking END and chaining off content\ntype, that feels like more logical ordering to me, but should not\nmatter from functional perspective.","state":0,"publishedAt":"2026-07-19T15:39:31.129+00:00","modifiedAt":"2026-10-19T20:28:10.562+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 \"net/tls/tls_sw.c\"\n ],\n \"versions\": [\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"49a5faaa471ddcd37b6893970c9916eb836e7c31\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"91359966e247c0244c66d50bbb8e74aefa4321c3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"410351158dfef2d67fea6603680b3a6013c6ed9d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"acdc12b71c9aa4be5dcd2c8062753c6d2033e235\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"929b1548e63ac72e104c07d8ee8cbbeeba2fa89a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"af855f4c966afafef74faf8390c7b86568c0d46d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n \"lessThan\": \"ff26a0e8377dec07e4a7230db7675bed1b9a6d03\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d529d6c9f7e3aaeac13c4948f79799ccb825f29d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.4.14\",\n \"lessThan\": \"5.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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 \"net/tls/tls_sw.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.5\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.5\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.258\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.209\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.142\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.92\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.34\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.11\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/49a5faaa471ddcd37b6893970c9916eb836e7c31","https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3","https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9d","https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235","https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89a","https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46d","https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36","https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64046","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64046","identifiers":["CVE-2026-64046"]},"retained":false,"historicalAffected":[]}],"coverage":[]}