CVE-2026-90404 platform/chrome: cros_ec_debugfs: Unregister panic notifier
A use-after-free vulnerability in the Linux kernel's Chrome OS EC debugfs driver allows a local attacker to cause a system crash or potentially execute code via a panic notification.
- 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-2026-90404?
CVE-2026-90404 is an use after free 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:
platform/chrome: cros_ec_debugfs: Unregister panic notifier
cros_ec_debugfs_probe() registers notifier_panic with the EC panic notifier chain. The remove path tears down debugfs and the console log, but leaves the notifier registered. A later panic notification can call back into the removed instance and queue work that accesses released data.
Unregister the panic notifier before tearing down the debugfs and console log state.
This issue was found by a static analysis tool.
Which versions are affected by CVE-2026-90404?
How do I fix CVE-2026-90404?
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-2026-90404 being exploited?
There is no known exploitation of CVE-2026-90404 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90404, DEBIAN-CVE-2026-90404, GHSA-vrhg-47fw-7vch, UBUNTU-CVE-2026-90404.