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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.

PUBLISHED Reserved 2026-01-13 | Published 2026-03-25 | Updated 2026-05-11 | Assigner Linux




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Product status

Default status
unaffected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before 82a35356b5c1f75fe6a8a561db44e8d0e49da8f9
affected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before b2e9626a9d16b9bbbd06498c9e73c93be354dc7a
affected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before eeea8da43ab86ac0a6b9cec225eec91564346940
affected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before fa18639deab4a3662d543200c5bfc29bf4e23173
affected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before 57e39fe8da573435fa35975f414f4dc17d9f8449
affected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2
affected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5
affected

1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 (git) before 767d23ade706d5fa51c36168e92a9c5533c351a1
affected

Default status
affected

2.6.31
affected

Any version before 2.6.31
unaffected

5.10.253 (semver)
unaffected

5.15.203 (semver)
unaffected

6.1.167 (semver)
unaffected

6.6.130 (semver)
unaffected

6.12.77 (semver)
unaffected

6.18.17 (semver)
unaffected

6.19.7 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/82a35356b5c1f75fe6a8a561db44e8d0e49da8f9

git.kernel.org/...c/b2e9626a9d16b9bbbd06498c9e73c93be354dc7a

git.kernel.org/...c/eeea8da43ab86ac0a6b9cec225eec91564346940

git.kernel.org/...c/fa18639deab4a3662d543200c5bfc29bf4e23173

git.kernel.org/...c/57e39fe8da573435fa35975f414f4dc17d9f8449

git.kernel.org/...c/584279ad9ff1e8e7c5494b9fce286201f7d1f9e2

git.kernel.org/...c/cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5

git.kernel.org/...c/767d23ade706d5fa51c36168e92a9c5533c351a1

cve.org (CVE-2026-23336)

nvd.nist.gov (CVE-2026-23336)

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