---
id: CVE-2026-74661
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mac802154: fix netdev use-after-free in beacon worker

  mac802154_beacon_worker() reads local->beacon_req under RCU and derives
  the sub-interface from the request, but t…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mac802154: fix netdev use-after-free in beacon worker

  mac802154_beacon_worker() reads local->beacon_req under RCU and derives
  the sub-interface from the request, but t…
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'
published: '2026-08-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74661'
references:
  - url: 'https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00125
epssPercentile: 0.01972
ingestedAt: '2026-10-14T13:30:58.530Z'
---

## Overview

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

mac802154: fix netdev use-after-free in beacon worker

mac802154_beacon_worker() reads local->beacon_req under RCU and derives
the sub-interface from the request, but then drops the RCU read lock and
continues to use both sdata and the embedded wpan_dev.

mac802154_stop_beacons_locked() cancels only pending beacon work, clears
local->beacon_req and frees the request.  A beacon worker that is already
running can therefore continue after interface teardown and dereference
the freed netdev private area.

The scan worker already pins the netdev before leaving RCU.  Apply the
same lifetime rule to the beacon worker: take a netdev reference while
the request is still protected by RCU, and release it on all paths that
continue after the reference is acquired.

## Remediation

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