CVE-2026-23336: wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()

High severity · published Mar 25, 2026

CVE-2026-23336

wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()

7.8

CVSS

0.1%

EPSS

On KEV

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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector

Local

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.1% · higher than 3% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Kernel · Linux

2.6.31.1 before 5.10.253; 5.11 before 5.15.203; 5.16 before 6.1.167; 6.2 before 6.6.130; 6.7 before 6.12.77; 6.13 before 6.18.17; +9 more · source: NVD

Linux · Linux

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before 82a35356b5c1f75fe6a8a561db44e8d0e49da8f9; 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before b2e9626a9d16b9bbbd06498c9e73c93be354dc7a; 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before eeea8da43ab86ac0a6b9cec225eec91564346940; 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before fa18639deab4a3662d543200c5bfc29bf4e23173; 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before 57e39fe8da573435fa35975f414f4dc17d9f8449; 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2; +3 more · source: vendor

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens

0 · source: CISA

Affected product

Kernel

Linux

All Kernel CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-23336

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-23336

Patch