CVE-2026-68126

Summary

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_hold() while the RCU read lock is still held, and release it at every worker exit.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux57588c71177f0bfc08509c2c3a9bfe32850c0786 < bd7110f0caa32426140ff302a209c53294ef2cfdaffected
LinuxLinux57588c71177f0bfc08509c2c3a9bfe32850c0786 < dd4754194a706163294b6141460101b99082c8c7affected
LinuxLinux57588c71177f0bfc08509c2c3a9bfe32850c0786 < 59c1d5463b7bc5a2cdaae27108d1dfd67edc7d1baffected
LinuxLinux57588c71177f0bfc08509c2c3a9bfe32850c0786 < 5f303f622f6bb8907c405e5123a0ab0f70fb0065affected
LinuxLinux57588c71177f0bfc08509c2c3a9bfe32850c0786 < 234e5e898b713bc0b3a631b6f002897f43d046c8affected
LinuxLinux6.3affected
LinuxLinux0 < 6.3unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc5 <= *unaffected

Weaknesses

References