CVE-2026-89439 platform/x86: ISST: Add a NULL check for sst_inst[]
A missing NULL check in the Linux kernel ISST driver can cause a system crash when socket loading fails, requiring a kernel patch.
- 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-2026-89439?
CVE-2026-89439 is a vulnerability in Linux, published on 11 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/x86: ISST: Add a NULL check for sst_inst[]
To be consistent with other places, add a NULL check for failed socket loading by checking isst_common.sst_inst[].
Which versions are affected by CVE-2026-89439?
How do I fix CVE-2026-89439?
Apply the vendor's patch.
Is CVE-2026-89439 being exploited?
There is no known exploitation of CVE-2026-89439 in the wild and no public exploit code.
Sources
Also known as AZL-100799, BELL-CVE-2026-89439, DEBIAN-CVE-2026-89439, GHSA-9cq2-4366-jjx6, UBUNTU-CVE-2026-89439.