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CVE-2026-74661

Unknown

Last modified

CVE-2026-74661 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 3accf4762734a69ebd03cba989249c78ac7dfc7e, < fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517; >= 3accf4762734a69ebd03cba989249c78ac7dfc7e, < e5fb0e03bc7f45508c182a427357bf6b389a9033; >= 3accf4762734a69ebd03cba989249c78ac7dfc7e, < e6cd416a899edc912b428c4ba399bd73f516cb31; >= 3accf4762734a69ebd03cba989249c78ac7dfc7e, < 9d067e581597c462c51fee8a30b51bc48a68c4e1; >= 3accf4762734a69ebd03cba989249c78ac7dfc7e, < 5f26a690e8efa54315e4922368daf54e0b8f5515
LinuxLinux6.3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74661?
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.
How severe is CVE-2026-74661?
Severity scoring for CVE-2026-74661 is pending analysis.
How do I fix CVE-2026-74661?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST