🛡️ CVE-2026-23336 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-23336 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.7)
  • linux-kernel

Timeline and source

Published on 25 March 2026 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-23336 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-03-25
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.7
linux-kernel — —

References

Similar Threats

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