CVE-2026-98316 ALSA: bcd2000: Fix race between rawmidi and disconnect
A race condition in the ALSA bcd2000 driver allows local attackers to trigger a use-after-free during USB disconnect, potentially causing system crashes or code execution.
- 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-2026-98316?
CVE-2026-98316 is a vulnerability in Linux, published on 6 Oct 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: bcd2000: Fix race between rawmidi and disconnect
Although we tried to fix the potential UAF issues at USB disconnect on bcd2000 driver, there is still an overlooked case -- namely, when a rawmidi trigger callback has been already running at USB disconnect handling, the in-flight function (e.g. bcd2000_midi_send()) could still access the URB, because the previous URB NULL-check & clearance was considered only for the URB complete callbacks, but not about the parallel rawmidi operations.
For addressing the race, this patch introduced a new spinlock that covers each rawmidi operation as well as the rawmidi handling in the complete callback. The URB is cleared with the lock, so it guarantees that the pending rawmidi task already finished or a NULL check is effective.
Which versions are affected by CVE-2026-98316?
How do I fix CVE-2026-98316?
Apply the vendor's patch.
Is CVE-2026-98316 being exploited?
There is no known exploitation of CVE-2026-98316 in the wild and no public exploit code.
Sources
Also known as AZL-106470, BELL-CVE-2026-98316, DEBIAN-CVE-2026-98316, GHSA-877f-c8m6-hq9r, UBUNTU-CVE-2026-98316.