CVE-2026-74661

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

State: Published
Severity: 7.8 High
Published: Aug 22, 2026
Updated: Aug 25, 2026
Reserved: Aug 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3accf4762734a69ebd03cba989249c78ac7dfc7e to before fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517Affected 3accf4762734a69ebd03cba989249c78ac7dfc7e to before e5fb0e03bc7f45508c182a427357bf6b389a9033Affected 3accf4762734a69ebd03cba989249c78ac7dfc7e to before e6cd416a899edc912b428c4ba399bd73f516cb31Affected 3accf4762734a69ebd03cba989249c78ac7dfc7e to before 9d067e581597c462c51fee8a30b51bc48a68c4e1Affected 3accf4762734a69ebd03cba989249c78ac7dfc7e to before 5f26a690e8efa54315e4922368daf54e0b8f5515Affected
LinuxLinux	6.3Affected before 6.3Not affected 6.6.152 through 6.6.Not affected 6.12.104 through 6.12.Not affected 6.18.45 through 6.18.Not affected 7.1.9 through 7.1.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

3accf4762734a69ebd03cba989249c78ac7dfc7e to before fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517Affected
3accf4762734a69ebd03cba989249c78ac7dfc7e to before e5fb0e03bc7f45508c182a427357bf6b389a9033Affected
3accf4762734a69ebd03cba989249c78ac7dfc7e to before e6cd416a899edc912b428c4ba399bd73f516cb31Affected
3accf4762734a69ebd03cba989249c78ac7dfc7e to before 9d067e581597c462c51fee8a30b51bc48a68c4e1Affected
3accf4762734a69ebd03cba989249c78ac7dfc7e to before 5f26a690e8efa54315e4922368daf54e0b8f5515Affected

LinuxLinux

6.3Affected
before 6.3Not affected
6.6.152 through 6.6.*Not affected
6.12.104 through 6.12.*Not affected
6.18.45 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

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