{"id":"CVE-2026-64047","revision":"0362968e828e429b94dd23ef08f0a50d","records":[{"revision":"0362968e828e429b94dd23ef08f0a50d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64047","aliases":[],"title":"net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring\n\nWhen an sk_msg scatterlist ring wraps (sg.end < sg.start),\ntls_push_record() chains the tail portion of the ring to the head\nusing sg_chain(). An extra entry in the sg array is reserved for\nthis:\n\n  struct sk_msg_sg {\n        [...]\n        /* The extra two elements:\n         * 1) used for chaining the front and sections when the list becomes\n         *    partitioned (e.g. end < start). The crypto APIs require the\n         *    chaining;\n         * 2) to chain tailer SG entries after the message.\n         */\n        struct scatterlist              data[MAX_MSG_FRAGS + 2];\n\nThe current code uses MAX_SKB_FRAGS + 1 as the ring size:\n\n    sg_chain(&msg_pl->sg.data[msg_pl->sg.start],\n             MAX_SKB_FRAGS - msg_pl->sg.start + 1,\n             msg_pl->sg.data);\n\nThis places the chain pointer at\n\n  sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\n  &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =\n  data[start + (MAX_SKB_FRAGS - start + 1) - 1] =\n  data[MAX_SKB_FRAGS]\n\ninstead of the true last entry. This is likely due to a \"race\" of\nthe commit under Fixes landing close to\ncommit 031097d9e079 (\"bpf: sk_msg, zap ingress queue on psock down\")\n\nConvert to ARRAY_SIZE and drop the data[start] / - start (as suggested\nby Sabrina).","state":0,"publishedAt":"2026-07-19T15:39:31.96+00:00","modifiedAt":"2026-10-19T20:28:10.717+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\": \"73963a375885d5ccb7def39fd0b4f542e0f343dd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n                            \"lessThan\": \"47110c3a9ac247b688657337f5981efcfcb240dc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n                            \"lessThan\": \"84158c2997159df4a0d70cd9c46774512d32a522\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n                            \"lessThan\": \"131ef12057d92b77b636321b7849c69222405a97\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n                            \"lessThan\": \"66339b71f105e6f83e0da3b9583d95077534fe1d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n                            \"lessThan\": \"eca989eab4b2599dcb02f72140a7c08f08838520\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n                            \"lessThan\": \"2fb0dc7e0099686c4e9d2732745d8a31b18c3628\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\",\n                            \"lessThan\": \"285943c6e7ca309bbea84b253745154241d9788a\",\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/73963a375885d5ccb7def39fd0b4f542e0f343dd","https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc","https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522","https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97","https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d","https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520","https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628","https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64047","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64047","identifiers":["CVE-2026-64047"]},"retained":false,"historicalAffected":[]}],"coverage":[]}