CVE-2026-92506 firmware: arm_scmi: Fix requested device removal race
A race condition in the Linux kernel SCMI driver allows concurrent unregistration to cause a use-after-free, potentially leading to 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-2026-92506?
CVE-2026-92506 is a vulnerability in Linux, published on 17 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:
firmware: arm_scmi: Fix requested device removal race
scmi_protocol_device_unrequest() drops scmi_requested_devices_mtx while notifying listeners but continues to retain the per-protocol list head. When two SCMI drivers for the same protocol unregister concurrently, one thread can remove the final request and free the list head while the other is running its notifier. The latter then dereferences the freed list head after reacquiring the mutex and can free it a second time.
Complete the list and IDR updates, including freeing an empty list head, before dropping the mutex. Keep the blocking notifier outside the critical section and retain only the detached request across the callback.
Which versions are affected by CVE-2026-92506?
How do I fix CVE-2026-92506?
Apply the vendor's patch.
Is CVE-2026-92506 being exploited?
There is no known exploitation of CVE-2026-92506 in the wild and no public exploit code.
Sources
Also known as AZL-101864, BELL-CVE-2026-92506, DEBIAN-CVE-2026-92506, GHSA-5f27-8j35-25fh, UBUNTU-CVE-2026-92506.