Vulnerability 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.
References
- https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515
- https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1
- https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033
- https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31
- https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517
FAQ
What is CVE-2026-74661?
CVE-2026-74661 is a documented vulnerability. 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 ...
How severe is CVE-2026-74661?
CVSS scoring is not yet available for CVE-2026-74661. Check NVD for updates.
Is there a patch for CVE-2026-74661?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.