CVE-2026-89992 cpuidle: dt_idle_genpd: kfree() the original name allocation
A memory corruption vulnerability in the Linux kernel cpuidle driver allows attackers to cause a denial of service via improper memory freeing.
- 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-2026-89992?
CVE-2026-89992 is a high-severity memory corruption vulnerability in Linux, published on 16 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:
cpuidle: dt_idle_genpd: kfree() the original name allocation
dt_idle_pd_alloc() kasprintf()s the full node path, then points pd->name at kbasename() of that string. dt_idle_pd_free() kfree()s pd->name, which is no longer the start of the allocation.
Copy the basename instead.
Which versions are affected by CVE-2026-89992?
How do I fix CVE-2026-89992?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-89992 being exploited?
There is no known exploitation of CVE-2026-89992 in the wild and no public exploit code.
Sources
Also known as AZL-101445, BELL-CVE-2026-89992, DEBIAN-CVE-2026-89992, GHSA-6r3p-g4m6-vqrh, UBUNTU-CVE-2026-89992.