Unknown

CVE-2026-80798 — nfc: llcp: reject PDUs shorter than the LLCP header

In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: reject PDUs shorter than the LLCP header Every LLCP PDU begins with a two-byte header (DSAP/SSAP + PTYPE), but the receive path never checked that a frame is at least LLCP_HEADER_SIZE bytes before parsing it. nfc_llcp_rx_skb() reads the header via nfc_llcp_ptype()/nfc_llcp_dsap()/ nfc_llcp_ssap(), which dereference pdu->data[0] and pdu->data[1], and a CONNECT or CC PDU then computes tlv_array_len = skb->len - LLCP_HEADER_SIZE; as a size_t and hands it to the TLV walk. When the frame is shorter than the header the subtraction wraps to a huge value and the walk runs far past the buffer, an out-of-bounds read. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Guard the common receive choke point __nfc_llcp_recv(), shared by both the target (nfc_llcp_data_received()) and initiator (nfc_llcp_recv()) paths, so a short skb is dropped before the rx_work worker parses it. Use pskb_may_pull() rather than a skb->len test so the two header bytes are guaranteed to sit in the skb linear area even for a non-linear skb, matching how the sibling NCI and HCI receive paths validate their headers. Reproduced with a KFENCE out-of-bounds read via /dev/virtual_nci on linux-next. Found by 0sec automated security-research tooling (https://0sec.ai).

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 26, 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	≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < f36cffea24bf3e2cc29a00d4b51dbcadc087d810≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < a7b9b449f5a5132221fff6adc11a9431ab8cd914≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < 3793d768b40f38bb97265dd5b9a8b8655c4e1b1d≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < eab47618e282602197db287ecbd1b09d356a2515≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < e969e98410051b1ef8cc318bfe0c7e3f24ec766d≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < ae5f20f5842f440b72d030e3a34fe182dd8eae42≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < d3d90243393c48146911c67fd3792b549d21d9e6 and 2 more ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a and < 95674f506c6376d6722a23144c9acd26609771edversion 3.3	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 26, 2026 · 11 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/95674f506c6376d6722a23144c9acd26609771ed
NIST National Vulnerability Database
git.kernel.org/stable/c/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d
NIST National Vulnerability Database
github.com/advisories/GHSA-p65w-76hh-qj57
GitHub Security Advisories
git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42
NIST National Vulnerability Database
git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82
NIST National Vulnerability Database
git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810
NIST National Vulnerability Database
git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6
NIST National Vulnerability Database
git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515
NIST National Vulnerability Database
git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914
NIST National Vulnerability Database
git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-80798
GitHub Security Advisories

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99092 riscv: patch: fix handling of bpf-jit execmem addresses 20h
Unknown CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting 20h
Unknown CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind 20h
Unknown CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions 20h
Unknown CVE-2026-99097 tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() 20h
Unknown CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size 20h

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-2026-80798 is "nfc: llcp: reject PDUs shorter than the LLCP header", 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.

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