---
id: CVE-2026-93784
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()

  The KASAN allocation trace shows that a malformed IE buffer is
  stored via SIOCSIWGENIE (cfg80211_wext_siwgenie…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()

  The KASAN allocation trace shows that a malformed IE buffer is
  stored via SIOCSIWGENIE (cfg80211_wext_siwgenie…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    c970879e03b23a27df42caf7ba506485a165fb96
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    01cc395cecfaa73134d39fb9a401d9605d8bb2c5
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a2f5286ca4f304d3fd469f01b96b518608912a5c
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T13:17:18.943'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93784'
references:
  - url: 'https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T16:47:15.904Z'
---

## Overview

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

wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()

The KASAN allocation trace shows that a malformed IE buffer is
stored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any
validation. The crash trace shows that a subsequent SIOCSIWESSID
triggers a connection attempt which calls cfg80211_sme_get_conn_ies()
to process the stored IE buffer, causing:

 - An out-of-bounds read in skip_ie() which reads ies[pos+1]
   (the length byte) past the end of the 1-byte buffer.

 - An integer underflow in the memcpy size argument when offs
   returned by ieee80211_ie_split() exceeds ies_len, causing
   unsigned subtraction to wrap to SIZE_MAX and triggering a
   fortify panic.

Fix this by validating the IE buffer in cfg80211_wext_siwgenie()
before storing it.

[drop unnecessary ie_len check, update commit message]

## Remediation

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