CVE-2026-68126

Technical Description

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

mac802154: hold an interface reference across the scan worker

mac802154_scan_worker() captures the scanning sub-interface under RCU

and then keeps dereferencing sdata->dev after rcu_read_unlock() and

outside the rtnl -- in the failure traces, in

mac802154_transmit_beacon_req() (skb->dev = sdata->dev), and in the

end_scan cleanup. Nothing keeps that netdev alive across the worker

iteration.

A concurrent DEL_INTERFACE or PHY removal can unregister the interface

once the worker drops the rtnl between its two drv_set_channel()

sections. unregister_netdevice() frees the netdev asynchronously from

netdev_run_todo() with the rtnl already dropped, so neither holding the

rtnl nor the per-PHY IEEE802154_IS_SCANNING flag prevents a stale worker

iteration from dereferencing the freed netdev -- a KASAN

slab-use-after-free, reachable by racing TRIGGER_SCAN against

DEL_INTERFACE (both CAP_NET_ADMIN).

Pin the netdev with netdev_ho

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References