CVE-2026-43223 media: pvrusb2: fix URB leak in pvr2_send_request_ex
A URB leak in the pvrusb2 driver can cause system warnings and potential instability when USB submissions fail, requiring a kernel patch.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43223?
CVE-2026-43223 is a medium-severity denial of service vulnerability in Linux kernel, published on 6 May 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: pvrusb2: fix URB leak in pvr2_send_request_ex
When pvr2_send_request_ex() submits a write URB successfully but fails to submit the read URB (e.g. returns -ENOMEM), it returns immediately without waiting for the write URB to complete. Since the driver reuses the same URB structure, a subsequent call to pvr2_send_request_ex() attempts to submit the still-active write URB, triggering a 'URB submitted while active' warning in usb_submit_urb().
Fix this by ensuring the write URB is unlinked and waited upon if the read URB submission fails.
Weakness: CWE-401
Which versions are affected by CVE-2026-43223?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43223?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-43223 being exploited?
There is no known exploitation of CVE-2026-43223 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43223, DEBIAN-CVE-2026-43223, GHSA-69m6-gcw2-m2rp, ROOT-OS-DEBIAN-11-CVE-2026-43223, ROOT-OS-UBUNTU-2204-CVE-2026-43223, ROOT-OS-UBUNTU-2404-CVE-2026-43223 and 1 more.