Unknown

CVE-2026-80796 — nfc: nci: add data_len bound checks to activation parameter extractors

In the Linux kernel, the following vulnerability has been resolved: nfc: nci: add data_len bound checks to activation parameter extractors nci_extract_activation_params_iso_dep() and nci_extract_activation_params_nfc_dep() read an inner length byte from the NCI RF_INTF_ACTIVATED_NTF payload and use it to memcpy() into fixed kernel buffers, but neither function receives the caller-validated activation_params_len. A crafted NCI notification with activation_params_len=1 and an inner length byte of up to 20 (NFC-A) or 50 (NFC-B) causes memcpy() to read that many bytes past the one valid byte in the activation params region -- a slab out-of-bounds read of kernel memory adjacent to the NCI skb. The sibling nci_extract_rf_params_*() family was given equivalent protection by commit 571dcbeb8e63 ("net: nfc: nci: Fix parameter validation for packet data"), but the two activation parameter extractors were not updated at that time. Add a data_len parameter to both functions, guard against an empty region before consuming the inner length byte, decrement the remaining count after consuming it, and clamp the copy length to what is actually available. Update both call sites to pass ntf.activation_params_len, which is already validated against the skb at ntf.c:801.

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)+1

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

0.2%

ahead of 9% 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	≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < 1168484fe2b3828bf24a46f3c42a8719fade679b≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < be311c0cfeadfbe815ea22d2914a98d06e3fab0e≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < 04e51353cb9fa321caaeeed8331d4cd041fbaca7≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < 9b01f5af0dc59263b59391b148bc78d83c0354a9≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < 9620a91f8d643b680f417a435db399a04d1e06d8≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < cf9d44be50b9074a5abdc301b4a3ba3e283591df≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < f5c534b53f8c424a8e7633c9b585475c4bf4ee18 and 2 more ≥ e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 and < 0428fa2c22e2ba0cff766d3b80d461e149102045version 3.3	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 26, 2026 · 11 reading(s) · max 0.20%

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/0428fa2c22e2ba0cff766d3b80d461e149102045
NIST National Vulnerability Database
git.kernel.org/stable/c/be311c0cfeadfbe815ea22d2914a98d06e3fab0e
NIST National Vulnerability Database
git.kernel.org/stable/c/1168484fe2b3828bf24a46f3c42a8719fade679b
NIST National Vulnerability Database
git.kernel.org/stable/c/cf9d44be50b9074a5abdc301b4a3ba3e283591df
NIST National Vulnerability Database
git.kernel.org/stable/c/9620a91f8d643b680f417a435db399a04d1e06d8
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-80796
GitHub Security Advisories
github.com/advisories/GHSA-x2c2-6crc-q5ch
GitHub Security Advisories
git.kernel.org/stable/c/f5c534b53f8c424a8e7633c9b585475c4bf4ee18
NIST National Vulnerability Database
git.kernel.org/stable/c/9b01f5af0dc59263b59391b148bc78d83c0354a9
NIST National Vulnerability Database
git.kernel.org/stable/c/e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300
NIST National Vulnerability Database
git.kernel.org/stable/c/04e51353cb9fa321caaeeed8331d4cd041fbaca7
NIST National Vulnerability Database

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 1d
Unknown CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting 1d
Unknown CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind 1d
Unknown CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions 1d
Unknown CVE-2026-99097 tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() 1d
Unknown CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size 1d

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-2026-80796 is "nfc: nci: add data_len bound checks to activation parameter extractors", 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 0.20% 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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