CVE-2026-62437 x86: DMs may cause mem leak by IRQ binding
A race condition in Xen allows a guest to cause a memory leak by re-binding IRQs during termination, potentially leading to denial of service.
- 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-2026-62437?
CVE-2026-62437 is a medium-severity vulnerability in Xen, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be.
Weakness: CWE-362
Which versions are affected by CVE-2026-62437?
How do I fix CVE-2026-62437?
Apply the vendor's patch.
Is CVE-2026-62437 being exploited?
There is no known exploitation of CVE-2026-62437 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-62437, DEBIAN-CVE-2026-62437, GHSA-vfxv-3qcw-g966, UBUNTU-CVE-2026-62437.