nfc: llcp: bound the connect_sn TLV walk to the skb
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: bound the connect_sn TLV walk to the skb Commit 27256cdb290e ("nfc: llcp: bound SNL TLV parsing to the skb and add length checks") fixed the unbounded TLV walk in nfc_llcp_recv_snl(), and commit d8bd2dedbde5 ("nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers") subsequently bounded nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv(). One sibling parser sharing the same pattern remains unbounded: nfc_llcp_connect_sn(). nfc_llcp_connect_sn() walks a TLV list, reading a two-byte header (type, length) followed by length bytes of value, without checking that the two header bytes or the declared length stay within the buffer. It returns a pointer to a service name of up to 255 bytes that may point past the end of the skb; it is subsequently consumed by memcmp() in nfc_llcp_sock_from_sn(). In addition tlv_array_len was computed as "skb->len - LLCP_HEADER_SIZE" in size_t, so a CONNECT/CC frame shorter than the LLCP header underflows to a huge length and the walk runs far past the buffer. nfc_llcp_connect_sn() is reachable from nfc_llcp_recv_connect() and nfc_llcp_recv_cc(), i.e. from received CONNECT and CC PDUs. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP, and the nfc_llcp_rx_skb() dispatcher applies no minimum-length guard. Walk the TLV list by pointer, bounded by skb_tail_pointer(skb), and validate each declared leng
CVE-2026-80800
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80800
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "e18d044bab6d3d0280639098c3fe6621692cbfe2",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "65a0ec7783b06068dda6745dd689bf4a91ee64aa",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "1964addc8dd535a05d5d3b55b4d1ac19ae31aa65",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "389986fd79e4d43f971a03b512645a1bb63c982f",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "e87527b506c40db9af528714b7b1240918eb80fc",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "22e5177ba1196a0b272a6a46c2575eb940a939c4",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "0cfbdb0e13ab5b0765d77f96af67eb879cbc9736",
"versionType": "git"
},
{
"status": "affected",
"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
"lessThan": "55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8",
"versionType": "git"
}
],
"programFiles": [
"net/nfc/llcp_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.267",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.154",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.106",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.47",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.11",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.1",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/nfc/llcp_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80800
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34818 · Revision 1
- Added to Heist Feed
- Publisher date