CVE-2022-50716

wifi: ar5523: Fix use-after-free on ar5523_cmd() timed out

State: Published
Severity: Not scored
Published: Dec 24, 2025
Updated: May 11, 2026
Reserved: Dec 24, 2025

Description

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

wifi: ar5523: Fix use-after-free on ar5523_cmd() timed out

syzkaller reported use-after-free with the stack trace like below [1]:

[ 38.960489][ C3] ================================================================== [ 38.963216][ C3] BUG: KASAN: use-after-free in ar5523_cmd_tx_cb+0x220/0x240 [ 38.964950][ C3] Read of size 8 at addr ffff888048e03450 by task swapper/3/0 [ 38.966363][ C3] [ 38.967053][ C3] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.0.0-09039-ga6afa4199d3d-dirty #18 [ 38.968464][ C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014 [ 38.969959][ C3] Call Trace: [ 38.970841][ C3] <IRQ> [ 38.971663][ C3] dump_stack_lvl+0xfc/0x174 [ 38.972620][ C3] print_report.cold+0x2c3/0x752 [ 38.973626][ C3] ? ar5523_cmd_tx_cb+0x220/0x240 [ 38.974644][ C3] kasan_report+0xb1/0x1d0 [ 38.975720][ C3] ? ar5523_cmd_tx_cb+0x220/0x240 [ 38.976831][ C3] ar5523_cmd_tx_cb+0x220/0x240 [ 38.978412][ C3] __usb_hcd_giveback_urb+0x353/0x5b0 [ 38.979755][ C3] usb_hcd_giveback_urb+0x385/0x430 [ 38.981266][ C3] dummy_timer+0x140c/0x34e0 [ 38.982925][ C3] ? notifier_call_chain+0xb5/0x1e0 [ 38.984761][ C3] ? rcu_read_lock_sched_held+0xb/0x60 [ 38.986242][ C3] ? lock_release+0x51c/0x790 [ 38.987323][ C3] ? _raw_read_unlock_irqrestore+0x37/0x70 [ 38.988483][ C3] ? __wake_up_common_lock+0xde/0x130 [ 38.989621][ C3] ? reacquire_held_locks+0x4a0/0x4a0 [ 38.990777][ C3] ? lock_acquire+0x472/0x550 [ 38.991919][ C3] ? rcu_read_lock_sched_held+0xb/0x60 [ 38.993138][ C3] ? lock_acquire+0x472/0x550 [ 38.994890][ C3] ? dummy_urb_enqueue+0x860/0x860 [ 38.996266][ C3] ? do_raw_spin_unlock+0x16f/0x230 [ 38.997670][ C3] ? dummy_urb_enqueue+0x860/0x860 [ 38.999116][ C3] call_timer_fn+0x1a0/0x6a0 [ 39.000668][ C3] ? add_timer_on+0x4a0/0x4a0 [ 39.002137][ C3] ? reacquire_held_locks+0x4a0/0x4a0 [ 39.003809][ C3] ? __next_timer_interrupt+0x226/0x2a0 [ 39.005509][ C3] __run_timers.part.0+0x69a/0xac0 [ 39.007025][ C3] ? dummy_urb_enqueue+0x860/0x860 [ 39.008716][ C3] ? call_timer_fn+0x6a0/0x6a0 [ 39.010254][ C3] ? cpuacct_percpu_seq_show+0x10/0x10 [ 39.011795][ C3] ? kvm_sched_clock_read+0x14/0x40 [ 39.013277][ C3] ? sched_clock_cpu+0x69/0x2b0 [ 39.014724][ C3] run_timer_softirq+0xb6/0x1d0 [ 39.016196][ C3] __do_softirq+0x1d2/0x9be [ 39.017616][ C3] __irq_exit_rcu+0xeb/0x190 [ 39.019004][ C3] irq_exit_rcu+0x5/0x20 [ 39.020361][ C3] sysvec_apic_timer_interrupt+0x8f/0xb0 [ 39.021965][ C3] </IRQ> [ 39.023237][ C3] <TASK>

In ar5523_probe(), ar5523_host_available() calls ar5523_cmd() as below (there are other functions which finally call ar5523_cmd()):

ar5523_probe() -> ar5523_host_available() -> ar5523_cmd_read() -> ar5523_cmd()

If ar5523_cmd() timed out, then ar5523_host_available() failed and ar5523_probe() freed the device structure. So, ar5523_cmd_tx_cb() might touch the freed structure.

This patch fixes this issue by canceling in-flight tx cmd if submitted urb timed out.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b7d572e1871df06a96a1c9591c71c5494ff6b624 to before c9ba3fbf6a488da6cad1d304c5234bd8d729eba3Affected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 340524ae7b53a72cf5d9e7bd7790433422b3b12fAffected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 6447beefd21326a3f4719ec2ea511df797f6c820Affected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 7360b323e0343ea099091d4ae09576dbe1f09516Affected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 8af52492717e3538eba3f81d012b1476af8a89a6Affected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 3eca9697c2f3905dea3ad2fc536ebaa1fbd735bdAffected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 601ae89375033ac4870c086e24ba03f235d38e55Affected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 9aef34e1ae35a87e5f6a22278c17823b7ce64c88Affected b7d572e1871df06a96a1c9591c71c5494ff6b624 to before b6702a942a069c2a975478d719e98d83cdae1797Affected
LinuxLinux	3.8Affected before 3.8Not affected 4.9.337 through 4.9.Not affected 4.14.303 through 4.14.Not affected 4.19.270 through 4.19.Not affected 5.4.229 through 5.4.Not affected 5.10.163 through 5.10.Not affected 5.15.86 through 5.15.Not affected 6.0.16 through 6.0.Not affected 6.1.2 through 6.1.Not affected 6.2 and laterNot affected

Product

Versions

LinuxLinux

b7d572e1871df06a96a1c9591c71c5494ff6b624 to before c9ba3fbf6a488da6cad1d304c5234bd8d729eba3Affected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 340524ae7b53a72cf5d9e7bd7790433422b3b12fAffected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 6447beefd21326a3f4719ec2ea511df797f6c820Affected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 7360b323e0343ea099091d4ae09576dbe1f09516Affected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 8af52492717e3538eba3f81d012b1476af8a89a6Affected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 3eca9697c2f3905dea3ad2fc536ebaa1fbd735bdAffected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 601ae89375033ac4870c086e24ba03f235d38e55Affected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before 9aef34e1ae35a87e5f6a22278c17823b7ce64c88Affected
b7d572e1871df06a96a1c9591c71c5494ff6b624 to before b6702a942a069c2a975478d719e98d83cdae1797Affected

LinuxLinux

3.8Affected
before 3.8Not affected
4.9.337 through 4.9.*Not affected
4.14.303 through 4.14.*Not affected
4.19.270 through 4.19.*Not affected
5.4.229 through 5.4.*Not affected
5.10.163 through 5.10.*Not affected
5.15.86 through 5.15.*Not affected
6.0.16 through 6.0.*Not affected
6.1.2 through 6.1.*Not affected
6.2 and laterNot affected

References

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