CVE-2026-23336 PUBLISHED

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

wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()

There is a use-after-free error in cfg80211_shutdown_all_interfaces found by syzkaller:

BUG: KASAN: use-after-free in cfg80211_shutdown_all_interfaces+0x213/0x220 Read of size 8 at addr ffff888112a78d98 by task kworker/0:5/5326 CPU: 0 UID: 0 PID: 5326 Comm: kworker/0:5 Not tainted 6.19.0-rc2 #2 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: events cfg80211_rfkill_block_work Call Trace: <TASK> dump_stack_lvl+0x116/0x1f0 print_report+0xcd/0x630 kasan_report+0xe0/0x110 cfg80211_shutdown_all_interfaces+0x213/0x220 cfg80211_rfkill_block_work+0x1e/0x30 process_one_work+0x9cf/0x1b70 worker_thread+0x6c8/0xf10 kthread+0x3c5/0x780 ret_from_fork+0x56d/0x700 ret_from_fork_asm+0x1a/0x30 </TASK>

The problem arises due to the rfkill_block work is not cancelled when wiphy is being unregistered. In order to fix the issue cancel the corresponding work in wiphy_unregister().

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

• https://git.kernel.org/stable/c/eeea8da43ab86ac0a6b9cec225eec91564346940
• https://git.kernel.org/stable/c/fa18639deab4a3662d543200c5bfc29bf4e23173
• https://git.kernel.org/stable/c/57e39fe8da573435fa35975f414f4dc17d9f8449
• https://git.kernel.org/stable/c/584279ad9ff1e8e7c5494b9fce286201f7d1f9e2
• https://git.kernel.org/stable/c/cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5
• https://git.kernel.org/stable/c/767d23ade706d5fa51c36168e92a9c5533c351a1