---
id: CVE-2026-93802
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: rsi: validate beacon length before fixed buffer copy

  rsi_prepare_beacon() copies the mac80211 beacon frame after
  FRAME_DESC_SZ into a management skb whose usable…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: rsi: validate beacon length before fixed buffer copy

  rsi_prepare_beacon() copies the mac80211 beacon frame after
  FRAME_DESC_SZ into a management skb whose usable…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-120
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d26a9559403c7c3ec3b430f5825bc22c3d40abdb <
    795ba65f46fe44061f1195951c122cc8ec685d44
  - >-
    Linux >= d26a9559403c7c3ec3b430f5825bc22c3d40abdb <
    66a964432b2758a4cf69962366e37581d6e70632
  - >-
    Linux >= d26a9559403c7c3ec3b430f5825bc22c3d40abdb <
    7f99742c3c2801f8033d8b7a0a58254d7f24fb1e
  - >-
    Linux >= d26a9559403c7c3ec3b430f5825bc22c3d40abdb <
    f08d7f3c916335a0e539f1c45c130615967fac47
  - >-
    Linux >= d26a9559403c7c3ec3b430f5825bc22c3d40abdb <
    87710ad633ce4588aec88611d0d0745eb33a6991
  - >-
    Linux >= d26a9559403c7c3ec3b430f5825bc22c3d40abdb <
    266f195d5a14eec6c482fd09fbc924584c3371a7
  - >-
    Linux >= d26a9559403c7c3ec3b430f5825bc22c3d40abdb <
    8ecdeb8b8a33b22c597299043c0dcfce50beb9ea
  - Linux 4.14
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:49.843'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93802'
references:
  - url: 'https://git.kernel.org/stable/c/266f195d5a14eec6c482fd09fbc924584c3371a7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/66a964432b2758a4cf69962366e37581d6e70632'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/795ba65f46fe44061f1195951c122cc8ec685d44'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7f99742c3c2801f8033d8b7a0a58254d7f24fb1e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/87710ad633ce4588aec88611d0d0745eb33a6991'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8ecdeb8b8a33b22c597299043c0dcfce50beb9ea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f08d7f3c916335a0e539f1c45c130615967fac47'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93802.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93802'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540562'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93802'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93802'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93802.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00173
epssPercentile: 0.0664
cvssSource: vendor
ingestedAt: '2026-09-24T16:47:15.898Z'
---

## Overview

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

wifi: rsi: validate beacon length before fixed buffer copy

rsi_prepare_beacon() copies the mac80211 beacon frame after
FRAME_DESC_SZ into a management skb whose usable tailroom may be smaller
than MAX_MGMT_PKT_SIZE after alignment.

Validate the beacon length against the actual tailroom before the copy
and skb_put(). Leave ownership of the management skb with the caller on
error, matching the existing rsi_send_beacon() cleanup path.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93802.json)