CVE-2026-23336

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()<br /> <br /> There is a use-after-free error in cfg80211_shutdown_all_interfaces found<br /> by syzkaller:<br /> <br /> BUG: KASAN: use-after-free in cfg80211_shutdown_all_interfaces+0x213/0x220<br /> Read of size 8 at addr ffff888112a78d98 by task kworker/0:5/5326<br /> CPU: 0 UID: 0 PID: 5326 Comm: kworker/0:5 Not tainted 6.19.0-rc2 #2 PREEMPT(voluntary)<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014<br /> Workqueue: events cfg80211_rfkill_block_work<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x116/0x1f0<br /> print_report+0xcd/0x630<br /> kasan_report+0xe0/0x110<br /> cfg80211_shutdown_all_interfaces+0x213/0x220<br /> cfg80211_rfkill_block_work+0x1e/0x30<br /> process_one_work+0x9cf/0x1b70<br /> worker_thread+0x6c8/0xf10<br /> kthread+0x3c5/0x780<br /> ret_from_fork+0x56d/0x700<br /> ret_from_fork_asm+0x1a/0x30<br /> <br /> <br /> The problem arises due to the rfkill_block work is not cancelled when wiphy<br /> is being unregistered. In order to fix the issue cancel the corresponding<br /> work in wiphy_unregister().<br /> <br /> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.