{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64047", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.029Z", "datePublished": "2026-07-19T15:39:31.960Z", "dateUpdated": "2026-08-05T12:38:39.300Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:39.300Z" }, "descriptions": [ { "lang": "en", "value": "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)." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The flaw is in kernel TLS (kTLS) software transmit encryption triggered when a TLS socket sends records; remote peers on established TLS connections drive this TX path through normal network I/O.\nAC:L - An attacker who controls connection traffic can reliably create the wrapped sk_msg ring state via BPF sockmap SK_MSG verdict helpers (push/pop/redirect) and then trigger record push on demand.\nPR:N - Exploitation requires no privileges on the target host beyond being a network peer on a kTLS socket with sockmap BPF already configured by the service; attacker capabilities are not needed on the victim system.\nUI:N - Triggering requires only automated server-side TLS transmit activity in response to network input, with no victim user action.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same kernel/host security boundary, not a cross-VM or sandbox escape by itself.\nC:H - Corrupting an active scatterlist entry causes the AEAD crypto path to follow an incorrect chain, enabling out-of-bounds kernel memory reads beyond intended plaintext buffers.\nI:H - The malformed scatterlist passed to crypto_aead_encrypt() can direct encryption I/O to wrong memory regions, providing an out-of-bounds write primitive exploitable for control-flow hijacking.\nA:H - Scatterlist corruption in the kernel crypto TX path can cause kernel oopses, panics, or fatal BUG conditions when invalid chain entries or page pointers are dereferenced." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_sw.c" ], "versions": [ { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "73963a375885d5ccb7def39fd0b4f542e0f343dd", "status": "affected", "versionType": "git" }, { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "47110c3a9ac247b688657337f5981efcfcb240dc", "status": "affected", "versionType": "git" }, { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "84158c2997159df4a0d70cd9c46774512d32a522", "status": "affected", "versionType": "git" }, { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "131ef12057d92b77b636321b7849c69222405a97", "status": "affected", "versionType": "git" }, { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "66339b71f105e6f83e0da3b9583d95077534fe1d", "status": "affected", "versionType": "git" }, { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "eca989eab4b2599dcb02f72140a7c08f08838520", "status": "affected", "versionType": "git" }, { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "2fb0dc7e0099686c4e9d2732745d8a31b18c3628", "status": "affected", "versionType": "git" }, { "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec", "lessThan": "285943c6e7ca309bbea84b253745154241d9788a", "status": "affected", "versionType": "git" }, { "version": "d529d6c9f7e3aaeac13c4948f79799ccb825f29d", "status": "affected", "versionType": "git" }, { "version": "5.4.14", "lessThan": "5.5", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_sw.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.6.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.14" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd" }, { "url": "https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc" }, { "url": "https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522" }, { "url": "https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97" }, { "url": "https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d" }, { "url": "https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520" }, { "url": "https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628" }, { "url": "https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a" } ], "title": "net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring", "x_generator": { "engine": "bippy-1.2.0" } } } }