mac802154: fix netdev use-after-free in beacon worker (CVE-2026-74661) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74661

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

Answer in brief

CVE-2026-74661 records a Unknown severity vulnerability in mac802154: fix netdev use-after-free in beacon worker. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 22, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=3accf4762734a69ebd03cba989249c78ac7dfc7e <fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517 \|\| >=3accf4762734a69ebd03cba989249c78ac7dfc7e <e5fb0e03bc7f45508c182a427357bf6b389a9033 \|\| >=3accf4762734a69ebd03cba989249c78ac7dfc7e <e6cd416a899edc912b428c4ba399bd73f516cb31 \|\| >=3accf4762734a69ebd03cba989249c78ac7dfc7e <9d067e581597c462c51fee8a30b51bc48a68c4e1 \|\| >=3accf4762734a69ebd03cba989249c78ac7dfc7e <5f26a690e8efa54315e4922368daf54e0b8f5515	fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517, e5fb0e03bc7f45508c182a427357bf6b389a9033, e6cd416a899edc912b428c4ba399bd73f516cb31, 9d067e581597c462c51fee8a30b51bc48a68c4e1, 5f26a690e8efa54315e4922368daf54e0b8f5515
Linux/Linuxgeneric	6.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.