CVE-2026-74437 media: uvcvideo: Fix deadlock if uvc_status_stop is called from async_ctrl.work
A deadlock in the Linux kernel's uvcvideo driver can cause a denial of service when a UVC camera triggers specific asynchronous control events.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74437?
CVE-2026-74437 is a vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
media: uvcvideo: Fix deadlock if uvc_status_stop is called from async_ctrl.work
If a UVC camera has an asynchronous control, uvc_status_stop may be called from async_ctrl.work:
uvc_ctrl_status_event_work() uvc_ctrl_status_event() uvc_ctrl_clear_handle() uvc_pm_put() uvc_status_put() uvc_status_stop() cancel_work_sync()
This will cause a deadlock, since cancel_work_sync will wait for uvc_ctrl_status_event_work to complete before returning.
Fix this by returning early from uvc_status_stop if we are currently in the work function. flush_status now remains false until uvc_status_start is called again, ensuring that uvc_ctrl_status_event_work won't resubmit the URB.
Which versions are affected by CVE-2026-74437?
How do I fix CVE-2026-74437?
Apply the vendor's patch.
Is CVE-2026-74437 being exploited?
There is no known exploitation of CVE-2026-74437 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74437, DEBIAN-CVE-2026-74437, GHSA-5vf9-4h4x-m5f6, UBUNTU-CVE-2026-74437.