CVE-2026-97423 cxl/region: Validate partition index before array access
An out-of-bounds array access in the Linux kernel CXL region driver can cause a system crash when the partition index is invalid.
- 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-2026-97423?
CVE-2026-97423 is a vulnerability in Linux, published on 24 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:
cxl/region: Validate partition index before array access
construct_region() reads cxled->part and uses it to index cxlds->part[] without checking for a negative value. If the partition was never resolved, part remains at its initial value of -1, causing an out-of-bounds array access.
Add a guard to return -EBUSY when part is negative.
The check was dropped during a merge.
Which versions are affected by CVE-2026-97423?
How do I fix CVE-2026-97423?
Apply the vendor's patch.
Is CVE-2026-97423 being exploited?
There is no known exploitation of CVE-2026-97423 in the wild and no public exploit code.
Sources
Also known as AZL-103835, BELL-CVE-2026-97423, DEBIAN-CVE-2026-97423, GHSA-c7p2-9jv2-f7w3, UBUNTU-CVE-2026-97423.