CVE-2026-23336

wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()

State: Published
Severity: 7.8 High
Published: Mar 25, 2026
Updated: Oct 19, 2026
Reserved: Jan 13, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 82a35356b5c1f75fe6a8a561db44e8d0e49da8f9Affected 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before b2e9626a9d16b9bbbd06498c9e73c93be354dc7aAffected 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before eeea8da43ab86ac0a6b9cec225eec91564346940Affected 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before fa18639deab4a3662d543200c5bfc29bf4e23173Affected 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 57e39fe8da573435fa35975f414f4dc17d9f8449Affected 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2Affected 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5Affected 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 767d23ade706d5fa51c36168e92a9c5533c351a1Affected
LinuxLinux	2.6.31Affected before 2.6.31Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.167 through 6.1.Not affected 6.6.130 through 6.6.Not affected 6.12.77 through 6.12.Not affected 6.18.17 through 6.18.Not affected 6.19.7 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 82a35356b5c1f75fe6a8a561db44e8d0e49da8f9Affected
1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before b2e9626a9d16b9bbbd06498c9e73c93be354dc7aAffected
1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before eeea8da43ab86ac0a6b9cec225eec91564346940Affected
1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before fa18639deab4a3662d543200c5bfc29bf4e23173Affected
1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 57e39fe8da573435fa35975f414f4dc17d9f8449Affected
1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2Affected
1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5Affected
1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 to before 767d23ade706d5fa51c36168e92a9c5533c351a1Affected

LinuxLinux

2.6.31Affected
before 2.6.31Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.167 through 6.1.*Not affected
6.6.130 through 6.6.*Not affected
6.12.77 through 6.12.*Not affected
6.18.17 through 6.18.*Not affected
6.19.7 through 6.19.*Not affected
7.0 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.