---
id: CVE-2026-90223
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: llcp: bound SNL TLV parsing to the skb and add length checks

  nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length
  pair derived from skb->len, wit…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: llcp: bound SNL TLV parsing to the skb and add length checks

  nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length
  pair derived from skb->len, wit…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    88b36d36e12c9ba76decdb580d9c1907c084e587
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    587fc2a5a35b41883b22b8f808fe5d345208914b
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    f04ac9bf2379f3e2470c400c235eb12f74891bef
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    02030f95820c42431280f4f945ff34247fb840ff
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    99fdb5c2522f365efa199d0117b641e35097041e
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    749a9048bf51a668ec3ab6c0392ba32325607281
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    eeb16fb24cfe67947b832fd9ada5f488afc72579
  - >-
    Linux >= 19cfe5843e86cc95542d9d875c9386e197956d75 <
    f4c7f37f0ab990952539dc68d931d65c3657600a
  - Linux 3.8
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:46.967'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90223'
references:
  - url: 'https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00468
epssPercentile: 0.37803
ingestedAt: '2026-09-17T16:21:47.854Z'
---

## Overview

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

nfc: llcp: bound SNL TLV parsing to the skb and add length checks

nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length
pair derived from skb->len, without bounding reads to the actual skb
data. Three problems followed:

  - For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed.
  - The per-TLV header (type, length) was read without checking that two
    bytes remained.
  - A declared TLV length could run past the end of the buffer, and an
    SDREQ with length == 0 made "service_name_len = length - 1" underflow
    (size_t), driving an out-of-bounds read in the following strncmp() /
    nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3]
    without a length check.

A nearby NFC device can reach this without authentication; LLCP link
activation happens automatically after NFC-DEP.

Walk the TLV list by pointer, bounded by skb_tail_pointer() over the
linear skb data, and validate each TLV declared length before use. Add
explicit length checks for SDREQ (>= 1) and SDRES (exactly 2).

Found by 0sec automated security-research tooling (https://0sec.ai).

## Remediation

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