# CVE-2026-98482: nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()

> A missing length check in the Linux kernel NFC LLCP handler allows reading uninitialized memory, potentially disclosing sensitive kernel data to nearby attackers.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-109082, BELL-CVE-2026-98482, DEBIAN-CVE-2026-98482, GHSA-8vvq-jjhc-wfc4, UBUNTU-CVE-2026-98482

## What is CVE-2026-98482?

CVE-2026-98482 is a vulnerability in Linux, published on 18 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()

nfc_llcp_recv_hdlc() reads the sequence byte skb->data[2], via
nfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path
only guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it
with pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs
-- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb
tailroom. The byte becomes N(R)/N(S); a peer can already set those with
a well-formed PDU, so this is acting on uninitialised memory, not new
peer control.

Guard the read with pskb_may_pull(), as commit 95674f506c63 ("nfc: llcp:
reject PDUs shorter than the LLCP header") did for the two-byte header,
so the sequence byte is present and linear before it is read. RR and RNR
PDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is
longer, so no valid frame is rejected; a truncated PDU is malformed, so
return without a DM reply.

## Which versions are affected by CVE-2026-98482?


## How do I fix CVE-2026-98482?

Apply the vendor's patch.

## Is CVE-2026-98482 being exploited?

There is no known exploitation of CVE-2026-98482 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-98482 and fix it if it is affected.

What it is: CVE-2026-98482 is a vulnerability in Linux, published on 18 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-98482 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-98482/ (Markdown: https://insights.sbomify.com/CVE-2026-98482/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-98482
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-98482
- OSV: https://osv.dev/vulnerability/CVE-2026-98482

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-98482/
Summaries are generated and may contain mistakes; the official description above is the record.