Description (CNA)
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
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 807f8a8c300435d5483e8d78df9dcdbc27333166 before c0fa1f3a4b021a5c6373169fd6c9bb4261d676a0; affected 807f8a8c300435d5483e8d78df9dcdbc27333166 before b51b42b974461fd0f688baad85f10e2b8ab215c5; affected 807f8a8c300435d5483e8d78df9dcdbc27333166 before 3368457b4871ae8f0f88d19c9a3e6270e850ede6; affected 807f8a8c300435d5483e8d78df9dcdbc27333166 before 308ffdf575560d7e7b8b21f1e3ca6276630f73bf; affected 807f8a8c300435d5483e8d78df9dcdbc27333166 before 9293574ac208d18c11073538851fb69355beb3b5; affected 807f8a8c300435d5483e8d78df9dcdbc27333166 before b119c70b24776c8ab2a2c0515397b3b0ad4e66cd; affected 807f8a8c300435d5483e8d78df9dcdbc27333166 before edf0730be33696a1bd142792830d392129e495cc |
| Linux / Linux | affected 3.0; unaffected 0 before 3.0; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c0fa1f3a4b021a5c6373169fd6c9bb4261d676a0
- https://git.kernel.org/stable/c/b51b42b974461fd0f688baad85f10e2b8ab215c5
- https://git.kernel.org/stable/c/3368457b4871ae8f0f88d19c9a3e6270e850ede6
- https://git.kernel.org/stable/c/308ffdf575560d7e7b8b21f1e3ca6276630f73bf
- https://git.kernel.org/stable/c/9293574ac208d18c11073538851fb69355beb3b5
- https://git.kernel.org/stable/c/b119c70b24776c8ab2a2c0515397b3b0ad4e66cd
- https://git.kernel.org/stable/c/edf0730be33696a1bd142792830d392129e495cc
ADP enrichment
No English description supplied.
No references supplied.