CVE-2026-64491 ALSA: usx2y: us144mkii: fix work UAF on disconnect
A use-after-free vulnerability in the Linux kernel ALSA usx2y driver allows local attackers to execute arbitrary code or escalate privileges via device disconnection.
- 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-2026-64491?
CVE-2026-64491 is an use after free vulnerability in Linux, published on 25 Jul 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: usx2y: us144mkii: fix work UAF on disconnect
tascam_disconnect() cancels capture_work and midi_in_work before usb_kill_anchored_urbs() kills the capture/MIDI-in URBs. Those URBs self-resubmit, and their completion handlers reschedule the work.
A URB that completes in the small window between cancel_work_sync() and usb_kill_anchored_urbs() therefore re-arms the work after its only cancel. Nothing cancels it again before snd_card_free() frees the card-private tascam structure, so the work handler then runs on freed memory.
Kill the anchored URBs before cancelling the work; once the work is cancelled no remaining URB can complete to re-arm it.
Which versions are affected by CVE-2026-64491?
How do I fix CVE-2026-64491?
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-2026-64491 being exploited?
There is no known exploitation of CVE-2026-64491 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-64491, DEBIAN-CVE-2026-64491, GHSA-97r3-fw5v-8xg8, ROOT-OS-UBUNTU-2204-CVE-2026-64491, UBUNTU-CVE-2026-64491.