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vuln-cve/data/2026/64xxx/CVE-2026-64047.json
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{
"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": "2026-10-19T20:28:10.717Z"
},
"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"
},
{
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"lessThan": "66339b71f105e6f83e0da3b9583d95077534fe1d",
"status": "affected",
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},
{
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"status": "affected",
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},
{
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"status": "affected",
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},
{
"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",
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},
{
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"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"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "7.1"
},
{
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"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"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-64047",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-16T15:35:54.546412Z"
}
}
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"type": "CWE",
"cweId": "CWE-191",
"description": "CWE-191 Integer Underflow (Wrap or Wraparound)"
}
]
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-19T20:28:10.717Z"
}
}
]
}
}
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