CVE-2026-80826 USB: c67x00: fix use-after-free in c67x00_add_iso_urb()
A use-after-free in the Linux kernel c67x00 USB driver allows local attackers to cause denial of service or execute arbitrary code.
- 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-2026-80826?
CVE-2026-80826 is an use after free vulnerability in Linux, published on 4 Sep 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:
USB: c67x00: fix use-after-free in c67x00_add_iso_urb()
When TD creation fails for the last packet of an isochronous URB, c67x00_add_iso_urb() gives the URB back before updating the endpoint scheduling state.
c67x00_giveback_urb() frees the URB private data, and the completion callback may release the final URB reference. The following accesses to urbp->ep_data, urb->interval, and urbp->cnt can therefore use freed memory.
Update next_frame and cnt before giving back the failed final packet, making the giveback the last operation that uses the URB and its private data.
Which versions are affected by CVE-2026-80826?
How do I fix CVE-2026-80826?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-80826 being exploited?
There is no known exploitation of CVE-2026-80826 in the wild and no public exploit code.
Sources
Also known as AZL-99611, BELL-CVE-2026-80826, DEBIAN-CVE-2026-80826, GHSA-24fg-x37m-25c7, UBUNTU-CVE-2026-80826.