CVE-2026-93080 firmware: arm_scmi: Fix transport device teardown lookup
A flaw in the Linux kernel SCMI driver allows malformed firmware to cause a denial of service during device teardown.
- 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-2026-93080?
CVE-2026-93080 is a denial of service 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 transport device teardown lookup
SCMI transport devices are deliberately excluded from normal SCMI bus matching so protocol drivers cannot bind to the internal transport children. However, scmi_device_destroy() uses the same protocol/name lookup to find devices that must be unregistered during channel teardown.
Split the match helper so driver matching still skips transport devices, while explicit child lookup can find them for teardown. Use a shared transport-device name prefix macro for both matching and name generation.
Since transport-device names are derived from direction and protocol ID, reject duplicate protocol channel setup before creating or finding a transport device. This prevents malformed firmware with duplicate protocol child nodes from reusing an existing transport device and then destroying it when the duplicate IDR insertion fails.
Which versions are affected by CVE-2026-93080?
How do I fix CVE-2026-93080?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-93080 being exploited?
There is no known exploitation of CVE-2026-93080 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93080, DEBIAN-CVE-2026-93080, GHSA-mj5f-93r8-jjjp, UBUNTU-CVE-2026-93080.