CVE-2026-68414

Status: UPDATED  |  Advisory ID: CVE-2026-68414

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: cancel sched scan results work on unregister

cfg80211_sched_scan_results() can queue rdev->sched_scan_res_wk from a

driver result notification while a scheduled scan request is present. The

work callback recovers the containing cfg80211_registered_device and then

locks the wiphy and walks the scheduled-scan request list.

wiphy_unregister() already makes the wiphy unreachable and drains rdev work

items before cfg80211_dev_free() can release the object, but it does not

drain sched_scan_res_wk. A queued or running result work item can therefore

cross the unregister/free boundary and access freed rdev state.

The buggy scenario involves two paths, with each column showing the order

within that path:

scheduled-scan result path: unregister/free path:

1. cfg80211_sched_scan_results() 1. interface teardown stops and

queues rdev->sched_scan_res_wk. removes the scheduled scan request.

2. cfg80211_wq starts the work 2. wiphy_unregister() drains other

item and recovers rdev. rdev work items.

3. The worker locks rdev->wiphy 3. cfg80211_dev_free() destroys and

and walks rdev state. frees rdev.

Cancel sched_scan_res_wk in wiphy_unregister() alongside the other rdev

work items. cancel_work_sync() removes a pending result notification and

waits for an already running callback, so cfg80211_dev_free() cannot free

rdev while this work item is still active.

Validation reproduced this kernel report:

BUG: KASAN: use-after-free in cfg80211_sched_scan_results_wk+0x4a6/0x530

Workqueue: cfg80211 cfg80211_sched_scan_results_wk [cfg80211]

Read of size 8

Call trace:

dump_stack_lvl+0x66/0xa0

print_report+0xce/0x630

cfg80211_sched_scan_results_wk+0x4a6/0x530

srso_alias_return_thunk+0x5/0xfbef5

__virt_addr_valid+0x224/0x430

kasan_report+0xac/0xe0

lockdep_hardirqs_on_prepare+0xea/0x1a0

process_one_work+0x8d0/0x18f0 (kernel/workqueue.c:3212)

lock_is_held_type+0x8f/0x100

worker_thread+0x5ad/0xfd0

__kthread_parkme+0xc6/0x200

kthread+0x31e/0x410

trace_hardirqs_on+0x1a/0x170

ret_from_fork+0x576/0x810

__switch_to+0x57e/0xe20

__switch_to_asm+0x33/0x70

ret_from_fork_asm+0x1a/0x30 (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References