---
id: CVE-2026-64174
title: 'wifi: cfg80211: advance loop vars in cfg80211_merge_profile()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: cfg80211: advance loop vars in cfg80211_merge_profile()

  cfg80211_merge_profile() reassembles a Multi-BSSID non-transmitted BSS
  profile that has been split across…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    5817e1e5205498a5df66eba2b34e817f4210fd0f
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    cedbb608494ba1e7a5c6c56b7f1d3fd470094f28
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    1ced0f5a851f9cae274545a42a06c459b7fd8881
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    67915715fd3874057457363c87c63e18829527df
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    6cfae4914439878b8acb35c7e3b40096eeb2ad9c
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    1343a480f84b80c1249133a90ef87f8751d65cbb
  - >-
    Linux >= fe806e4992c9047affd263bcc13b2c047029a726 <
    7666dbb1bacc4ba522b96740cba7283d243d16e1
  - Linux 5.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:31:13.656098Z'
published: '2026-07-19'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:34:28.044Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64174'
references:
  - url: 'https://git.kernel.org/stable/c/5817e1e5205498a5df66eba2b34e817f4210fd0f'
  - url: 'https://git.kernel.org/stable/c/cedbb608494ba1e7a5c6c56b7f1d3fd470094f28'
  - url: 'https://git.kernel.org/stable/c/c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8'
  - url: 'https://git.kernel.org/stable/c/1ced0f5a851f9cae274545a42a06c459b7fd8881'
  - url: 'https://git.kernel.org/stable/c/67915715fd3874057457363c87c63e18829527df'
  - url: 'https://git.kernel.org/stable/c/6cfae4914439878b8acb35c7e3b40096eeb2ad9c'
  - url: 'https://git.kernel.org/stable/c/1343a480f84b80c1249133a90ef87f8751d65cbb'
  - url: 'https://git.kernel.org/stable/c/7666dbb1bacc4ba522b96740cba7283d243d16e1'
tags:
  - cve.org
epss: 0.0012
epssPercentile: 0.01809
ingestedAt: '2026-11-06T16:57:43.231Z'
---

## Overview

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

wifi: cfg80211: advance loop vars in cfg80211_merge_profile()

cfg80211_merge_profile() reassembles a Multi-BSSID non-transmitted BSS
profile that has been split across multiple consecutive MBSSID elements.
Its while-loop calls

	cfg80211_get_profile_continuation(ie, ielen, mbssid_elem, sub_elem)

but never advances mbssid_elem or sub_elem inside the body.  Each
iteration therefore searches for a continuation that follows the same
fixed pair; the helper returns the same next_mbssid; and the same
next_sub bytes are memcpy()'d into merged_ie at a growing offset until
the buffer fills.

Advance both mbssid_elem and sub_elem to the just-consumed continuation
so the next call to cfg80211_get_profile_continuation() searches for a
further continuation beyond it (or returns NULL when none exists).

A specially-crafted malicious beacon can take advantage of this bug
to cause the kernel to spend an excessive amount of time in
cfg80211_merge_profile (up to as much as 2ms per beacon received),
which could theoretically be abused in some way.

## Affected

- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < 5817e1e5205498a5df66eba2b34e817f4210fd0f`
- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < cedbb608494ba1e7a5c6c56b7f1d3fd470094f28`
- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < c0bc4c8bd556cbe036a5b9ed333c0aab9aadfcb8`
- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < 1ced0f5a851f9cae274545a42a06c459b7fd8881`
- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < 67915715fd3874057457363c87c63e18829527df`
- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < 6cfae4914439878b8acb35c7e3b40096eeb2ad9c`
- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < 1343a480f84b80c1249133a90ef87f8751d65cbb`
- `Linux >= fe806e4992c9047affd263bcc13b2c047029a726 < 7666dbb1bacc4ba522b96740cba7283d243d16e1`
- `Linux 5.2`

## Remediation

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