CVE-2026-90335 tty: skip cdev_del() when no cdev is registered
A local attacker can trigger a kernel crash by removing a TTY device that failed to register, causing a null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90335?
CVE-2026-90335 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:
tty: skip cdev_del() when no cdev is registered
TTY device registration can fail before a cdev is allocated. Serial core keeps the port so setserial can still use it, and later removal passes the NULL cdev slot to cdev_del(), causing a NULL-pointer dereference.
Only delete the cdev when the slot is not NULL.
Which versions are affected by CVE-2026-90335?
How do I fix CVE-2026-90335?
Apply the vendor's patch.
Is CVE-2026-90335 being exploited?
There is no known exploitation of CVE-2026-90335 in the wild and no public exploit code.
Sources
Also known as AZL-102818, BELL-CVE-2026-90335, DEBIAN-CVE-2026-90335, GHSA-5wc4-c9q8-2q27, UBUNTU-CVE-2026-90335.