---
id: CVE-2026-98482
title: 'nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()'
summary: |-
  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 …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    3afdbebfee2ef7e9510880868cfb482cbffe6836
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    9b4086eb67a9a3b1ce69fef1b6793827363703ce
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    51b6d73373589abb9de4d84767b0db1bc8d395d9
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    066205553a0106565bcede934f5721c25ebd6e4e
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    18f60ee882403d5b48097f5f6ae45f794e4cc643
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    810f204ef8f61f0c930cf6b3280050b3ee6a8ae7
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    744e61bd06188d8bb068c26a461c252f242b05c9
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    273f9d667cde649f8de9d72b1303cc2f4b658c50
  - Linux 3.3
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:15:56.227Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98482'
references:
  - url: 'https://git.kernel.org/stable/c/3afdbebfee2ef7e9510880868cfb482cbffe6836'
  - url: 'https://git.kernel.org/stable/c/9b4086eb67a9a3b1ce69fef1b6793827363703ce'
  - url: 'https://git.kernel.org/stable/c/51b6d73373589abb9de4d84767b0db1bc8d395d9'
  - url: 'https://git.kernel.org/stable/c/066205553a0106565bcede934f5721c25ebd6e4e'
  - url: 'https://git.kernel.org/stable/c/18f60ee882403d5b48097f5f6ae45f794e4cc643'
  - url: 'https://git.kernel.org/stable/c/810f204ef8f61f0c930cf6b3280050b3ee6a8ae7'
  - url: 'https://git.kernel.org/stable/c/744e61bd06188d8bb068c26a461c252f242b05c9'
  - url: 'https://git.kernel.org/stable/c/273f9d667cde649f8de9d72b1303cc2f4b658c50'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.295Z'
---

## Overview

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.

## Affected

- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 3afdbebfee2ef7e9510880868cfb482cbffe6836`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 9b4086eb67a9a3b1ce69fef1b6793827363703ce`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 51b6d73373589abb9de4d84767b0db1bc8d395d9`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 066205553a0106565bcede934f5721c25ebd6e4e`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 18f60ee882403d5b48097f5f6ae45f794e4cc643`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 810f204ef8f61f0c930cf6b3280050b3ee6a8ae7`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 744e61bd06188d8bb068c26a461c252f242b05c9`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 273f9d667cde649f8de9d72b1303cc2f4b658c50`
- `Linux 3.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.