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vuln-cve/data/2026/80xxx/CVE-2026-80800.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-80800",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-26T14:34:25.793Z",
"datePublished": "2026-09-04T15:13:14.271Z",
"dateUpdated": "2026-10-19T08:43:53.425Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:43:53.425Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound the connect_sn TLV walk to the skb\n\nCommit 27256cdb290e (\"nfc: llcp: bound SNL TLV parsing to the skb and\nadd length checks\") fixed the unbounded TLV walk in nfc_llcp_recv_snl(),\nand commit d8bd2dedbde5 (\"nfc: llcp: fix OOB read and u8 offset wrap in\nTLV parsers\") subsequently bounded nfc_llcp_parse_gb_tlv() and\nnfc_llcp_parse_connection_tlv(). One sibling parser sharing the same\npattern remains unbounded: nfc_llcp_connect_sn().\n\nnfc_llcp_connect_sn() walks a TLV list, reading a two-byte header\n(type, length) followed by length bytes of value, without checking that\nthe two header bytes or the declared length stay within the buffer. It\nreturns a pointer to a service name of up to 255 bytes that may point\npast the end of the skb; it is subsequently consumed by memcmp() in\nnfc_llcp_sock_from_sn(). In addition tlv_array_len was computed as\n\"skb->len - LLCP_HEADER_SIZE\" in size_t, so a CONNECT/CC frame shorter\nthan the LLCP header underflows to a huge length and the walk runs far\npast the buffer.\n\nnfc_llcp_connect_sn() is reachable from nfc_llcp_recv_connect() and\nnfc_llcp_recv_cc(), i.e. from received CONNECT and CC PDUs. A nearby\nNFC device can reach this without authentication; LLCP link activation\nhappens automatically after NFC-DEP, and the nfc_llcp_rx_skb()\ndispatcher applies no minimum-length guard.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer(skb), and\nvalidate each declared length before use, matching the approach already\nused for nfc_llcp_recv_snl(). Starting the walk at\n&skb->data[LLCP_HEADER_SIZE] against the tail pointer also removes the\nsize_t underflow for short frames.\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/nfc/llcp_core.c"
],
"versions": [
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "e18d044bab6d3d0280639098c3fe6621692cbfe2",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "65a0ec7783b06068dda6745dd689bf4a91ee64aa",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "1964addc8dd535a05d5d3b55b4d1ac19ae31aa65",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "389986fd79e4d43f971a03b512645a1bb63c982f",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "e87527b506c40db9af528714b7b1240918eb80fc",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "22e5177ba1196a0b272a6a46c2575eb940a939c4",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "0cfbdb0e13ab5b0765d77f96af67eb879cbc9736",
"status": "affected",
"versionType": "git"
},
{
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/nfc/llcp_core.c"
],
"versions": [
{
"version": "3.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.3",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.267",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.218",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.185",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.154",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.106",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.47",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.11",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.1",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"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": "3.3",
"versionEndExcluding": "5.10.267"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "5.15.218"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "6.1.185"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "6.6.154"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "6.12.106"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "6.18.47"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "7.1.11"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "7.2.1"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.3",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e"
},
{
"url": "https://git.kernel.org/stable/c/e18d044bab6d3d0280639098c3fe6621692cbfe2"
},
{
"url": "https://git.kernel.org/stable/c/65a0ec7783b06068dda6745dd689bf4a91ee64aa"
},
{
"url": "https://git.kernel.org/stable/c/1964addc8dd535a05d5d3b55b4d1ac19ae31aa65"
},
{
"url": "https://git.kernel.org/stable/c/389986fd79e4d43f971a03b512645a1bb63c982f"
},
{
"url": "https://git.kernel.org/stable/c/e87527b506c40db9af528714b7b1240918eb80fc"
},
{
"url": "https://git.kernel.org/stable/c/22e5177ba1196a0b272a6a46c2575eb940a939c4"
},
{
"url": "https://git.kernel.org/stable/c/0cfbdb0e13ab5b0765d77f96af67eb879cbc9736"
},
{
"url": "https://git.kernel.org/stable/c/55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8"
}
],
"title": "nfc: llcp: bound the connect_sn TLV walk to the skb",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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