High 7.8Published Mar 25, 2026

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

Updated under an hour ago (Oct 27, 2026, 7:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before 82a35356b5c1f75fe6a8a561db44e8d0e49da8f9; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before b2e9626a9d16b9bbbd06498c9e73c93be354dc7a; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before eeea8da43ab86ac0a6b9cec225eec91564346940; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before fa18639deab4a3662d543200c5bfc29bf4e23173; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before 57e39fe8da573435fa35975f414f4dc17d9f8449; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 before 767d23ade706d5fa51c36168e92a9c5533c351a1	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.31.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 2.6.31; and 7 more ranges	NVD

References

References

https://git.kernel.org/stable/c/82a35356b5c1f75fe6a8a561db44e8d0e49da8f9	patch
https://git.kernel.org/stable/c/b2e9626a9d16b9bbbd06498c9e73c93be354dc7a	patch
https://git.kernel.org/stable/c/eeea8da43ab86ac0a6b9cec225eec91564346940	patch
https://git.kernel.org/stable/c/fa18639deab4a3662d543200c5bfc29bf4e23173	patch
https://git.kernel.org/stable/c/57e39fe8da573435fa35975f414f4dc17d9f8449	patch
https://git.kernel.org/stable/c/584279ad9ff1e8e7c5494b9fce286201f7d1f9e2	patch
https://git.kernel.org/stable/c/cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5	patch
https://git.kernel.org/stable/c/767d23ade706d5fa51c36168e92a9c5533c351a1	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.