{"id":"CVE-2026-64046","title":"net: tls: prevent chain-after-chain in plain text SG","summary":"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 af…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 49a5faaa471ddcd37b6893970c9916eb836e7c31","Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 91359966e247c0244c66d50bbb8e74aefa4321c3","Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 410351158dfef2d67fea6603680b3a6013c6ed9d","Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < acdc12b71c9aa4be5dcd2c8062753c6d2033e235","Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 929b1548e63ac72e104c07d8ee8cbbeeba2fa89a","Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < af855f4c966afafef74faf8390c7b86568c0d46d","Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36","Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < ff26a0e8377dec07e4a7230db7675bed1b9a6d03","Linux d529d6c9f7e3aaeac13c4948f79799ccb825f29d","Linux >= 5.4.14 < 5.5","Linux 5.5"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:35:52.163580Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:20.684Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64046","references":[{"url":"https://git.kernel.org/stable/c/49a5faaa471ddcd37b6893970c9916eb836e7c31"},{"url":"https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3"},{"url":"https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9d"},{"url":"https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235"},{"url":"https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89a"},{"url":"https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46d"},{"url":"https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36"},{"url":"https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03"}],"tags":["cve.org"],"epss":0.00514,"epssPercentile":0.4249,"ingestedAt":"2026-10-16T17:24:46.792Z","slug":"CVE-2026-64046","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 49a5faaa471ddcd37b6893970c9916eb836e7c31`\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 91359966e247c0244c66d50bbb8e74aefa4321c3`\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 410351158dfef2d67fea6603680b3a6013c6ed9d`\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < acdc12b71c9aa4be5dcd2c8062753c6d2033e235`\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < 929b1548e63ac72e104c07d8ee8cbbeeba2fa89a`\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < af855f4c966afafef74faf8390c7b86568c0d46d`\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36`\n- `Linux >= 9aaaa56845a06aeabdd597cbe19492dc01f281ec < ff26a0e8377dec07e4a7230db7675bed1b9a6d03`\n- `Linux d529d6c9f7e3aaeac13c4948f79799ccb825f29d`\n- `Linux >= 5.4.14 < 5.5`\n- `Linux 5.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}