CVE-2026-64601 ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission
A use-after-free vulnerability in the Linux kernel ALSA us144mkii driver allows attackers to cause denial of service or execute code via corrupted USB anchor lists.
- 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-2026-64601?
CVE-2026-64601 is a high-severity use after free vulnerability in Linux, published on 6 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:
ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission
In capture_urb_complete(), usb_anchor_urb() is called on every completion callback, but the URB is already anchored from the initial submission in tascam_trigger_start(). Each redundant call corrupts the anchor's doubly-linked list and inflates the URB refcount. When usb_kill_anchored_urbs() traverses the list during stream stop / suspend / disconnect, the corrupted list leads to use-after-free.
Remove the redundant usb_anchor_urb() from the resubmit path.
Which versions are affected by CVE-2026-64601?
How do I fix CVE-2026-64601?
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-2026-64601 being exploited?
There is no known exploitation of CVE-2026-64601 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-64601, DEBIAN-CVE-2026-64601, GHSA-2x99-3h9h-f4c9, UBUNTU-CVE-2026-64601.