nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain three related bugs in their TLV parsing loops: 1. 'offset' is declared u8 but tlv_array_len is u16. When TLV data advances offset past 255 it silently wraps to zero, causing infinite loops or double-processing of buffer data. 2. Before reading tlv[0] (type) and tlv[1] (length) there is no check that offset+2 <= tlv_array_len. A truncated TLV causes an OOB read of one byte past the buffer end. 3. After reading the length field, the value bytes are accessed without checking offset+2+length <= tlv_array_len. A crafted length=0xFF on a short buffer causes up to 255 bytes of OOB read past the buffer end. Both functions are reachable without authentication via nfc_llcp_set_remote_gb() which feeds remote LLCP general bytes directly into nfc_llcp_parse_gb_tlv() with no additional validation. Fix all three issues by widening offset from u8 to u16 and adding bounds checks for both the TLV header and value field before each access.
CVE-2026-80799
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-2026-80799
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": "0be9de2ea01e8d52646e7310a7eef5459cf07ea8",
"lessThan": "2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "7f6f3d087c67a4346189ef2c36481455bbc59a74",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "9c47d667963542c3cf8e3007b7f10c0904d08238",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "a209334ed929941b20810c17c3a507445b0a7c85",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "382eaa770335acf4f16a5a55524500f2bb4207df",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "2d239590d1845a706304833d40dd6d4fec20ad88",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "e84cdfdc4a6c88e8b751144458f2e04e24415a28",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "875285a165fd3b402de2ab3be0deb355d6f4caf5",
"versionType": "git"
},
{
"status": "affected",
"version": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0",
"lessThan": "78b20c8eeacd2e44a2d8a4cb5316d3c521d90911",
"versionType": "git"
},
{
"status": "affected",
"version": "1deacb5e031e289ca5636f2db4fcae6612c05d34",
"versionType": "git"
},
{
"status": "affected",
"version": "66a1be74230bbe098e651766c9a0cf4038db8442",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.188",
"lessThan": "5.10.267",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.291",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.251",
"lessThan": "5.5",
"versionType": "semver"
}
],
"programFiles": [
"net/nfc/llcp_commands.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"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_commands.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80799
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34816 · Revision 1
- Added to Heist Feed
- Publisher date