Unknown

CVE-2026-80799 — 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.

Published Sep 4, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.23%

ahead of 14% of scored CVEs · Oct 29, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 0be9de2ea01e8d52646e7310a7eef5459cf07ea8 and < 2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < 7f6f3d087c67a4346189ef2c36481455bbc59a74≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < 9c47d667963542c3cf8e3007b7f10c0904d08238≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < a209334ed929941b20810c17c3a507445b0a7c85≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < 382eaa770335acf4f16a5a55524500f2bb4207df≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < 2d239590d1845a706304833d40dd6d4fec20ad88≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < e84cdfdc4a6c88e8b751144458f2e04e24415a28≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < 875285a165fd3b402de2ab3be0deb355d6f4caf5 and 7 more ≥ 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0 and < 78b20c8eeacd2e44a2d8a4cb5316d3c521d90911version 1deacb5e031e289ca5636f2db4fcae6612c05d34version 66a1be74230bbe098e651766c9a0cf4038db8442≥ 5.10.188 and < 5.10.267≥ 4.19.291 and < 4.20≥ 5.4.251 and < 5.5version 5.15	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 29, 2026 · 14 reading(s) · max 0.29%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

11 on the record

git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df
NIST National Vulnerability Database
github.com/advisories/GHSA-2vfp-4qhq-6rfc
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2026-80799
GitHub Security Advisories
git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88
NIST National Vulnerability Database
git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74
NIST National Vulnerability Database
git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1
NIST National Vulnerability Database
git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238
NIST National Vulnerability Database
git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5
NIST National Vulnerability Database
git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85
NIST National Vulnerability Database
git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28
NIST National Vulnerability Database
git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 2d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 2d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 2d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 2d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 2d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80799 is "nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.23% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.