---
id: CVE-2026-53182
title: 'wifi: nl80211: reject oversized EMA RNR lists'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: nl80211: reject oversized EMA RNR lists

  nl80211_parse_rnr_elems() stores the parsed element count in a
  u8-backed cfg80211_rnr_elems::cnt field and uses that coun…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 56189d7bc30531def6b999f27940ee43c6ff2569 <
    fc0ec2fc02dfe52c5821f36fbccf6a45df43f508
  - >-
    Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a <
    688fcac7054abc680c0eef753f2bb772cfaf8cf7
  - >-
    Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a <
    30c3fa80f423613efdda3deca4af52ff7d20e4e2
  - >-
    Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a <
    265c07c09c837621730d35f02975207a1224bf05
  - >-
    Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a <
    ecbf3c45add30a0857414e156bdb9c79906f0ff6
  - >-
    Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a <
    4cd92957e8f8cc4ebfe8a5d4203c14c592fde6b1
  - Linux >= 6.1.160 < 6.1.176
  - Linux 6.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:26:12.576651Z'
published: '2026-06-25'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:31:34.888Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53182'
references:
  - url: 'https://git.kernel.org/stable/c/fc0ec2fc02dfe52c5821f36fbccf6a45df43f508'
  - url: 'https://git.kernel.org/stable/c/688fcac7054abc680c0eef753f2bb772cfaf8cf7'
  - url: 'https://git.kernel.org/stable/c/30c3fa80f423613efdda3deca4af52ff7d20e4e2'
  - url: 'https://git.kernel.org/stable/c/265c07c09c837621730d35f02975207a1224bf05'
  - url: 'https://git.kernel.org/stable/c/ecbf3c45add30a0857414e156bdb9c79906f0ff6'
  - url: 'https://git.kernel.org/stable/c/4cd92957e8f8cc4ebfe8a5d4203c14c592fde6b1'
tags:
  - cve.org
epss: 0.00129
epssPercentile: 0.02275
ingestedAt: '2026-10-16T17:24:46.733Z'
---

## Overview

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

wifi: nl80211: reject oversized EMA RNR lists

nl80211_parse_rnr_elems() stores the parsed element count in a
u8-backed cfg80211_rnr_elems::cnt field and uses that count to size
the flexible array allocation.

Reject nested NL80211_ATTR_EMA_RNR_ELEMS input once the count reaches
255, before incrementing it again. This keeps the parser aligned with
the data structure it fills and matches the existing bound check used
by nl80211_parse_mbssid_elems().

## Affected

- `Linux >= 56189d7bc30531def6b999f27940ee43c6ff2569 < fc0ec2fc02dfe52c5821f36fbccf6a45df43f508`
- `Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a < 688fcac7054abc680c0eef753f2bb772cfaf8cf7`
- `Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a < 30c3fa80f423613efdda3deca4af52ff7d20e4e2`
- `Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a < 265c07c09c837621730d35f02975207a1224bf05`
- `Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a < ecbf3c45add30a0857414e156bdb9c79906f0ff6`
- `Linux >= dbbb27e183b1568d5a907ace1cd144b0709ea52a < 4cd92957e8f8cc4ebfe8a5d4203c14c592fde6b1`
- `Linux >= 6.1.160 < 6.1.176`
- `Linux 6.4`

## Remediation

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