CVE-2026-74273 cxl/region: Block region delete during region creation
A race condition in the Linux kernel CXL region driver allows local users to trigger a denial of service by deleting regions during creation.
- 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-2026-74273?
CVE-2026-74273 is a vulnerability in Linux, published on 15 Aug 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: Block region delete during region creation
Expand the range lock, rename it "regions_lock", to disable region deletion in the critical period between construct_region() and attach_target(), as well as the period between device_add() and registering the remove actions.
Otherwise, userspace can confuse the kernel. It can violate the assumption the region stays registered through the completion of cxl_add_to_region(). It can violate the assumption that devm_add_action_or_reset() is working with a live 'struct cxl_region'.
It is ok for the region to disappear outside of those windows as that mirrors device hotplug flows where the proper locks are held.
Which versions are affected by CVE-2026-74273?
How do I fix CVE-2026-74273?
Apply the vendor's patch.
Is CVE-2026-74273 being exploited?
There is no known exploitation of CVE-2026-74273 in the wild and no public exploit code.
Sources
Also known as AZL-110426, BELL-CVE-2026-74273, DEBIAN-CVE-2026-74273, GHSA-447m-c2m6-7v5x, UBUNTU-CVE-2026-74273.