CVE-2026-79607 Xenstore: Guests can crash xenstored during Live Update
A guest can crash the Xenstore daemon during live update due to inconsistent state handling, causing a 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-2026-79607?
CVE-2026-79607 is a medium-severity denial of service vulnerability in Xen, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
During Xenstore live update the state record for a Xenstore watch with specified watch depth is written with two bytes missing. This results in an inconsistent state when reading the state back in the new Xenstore, causing a crash of Xenstore or wrong Xenstore data.
Weakness: CWE-119
Which versions are affected by CVE-2026-79607?
How do I fix CVE-2026-79607?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-79607 being exploited?
There is no known exploitation of CVE-2026-79607 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-79607, GHSA-wwvq-f4q5-r467, UBUNTU-CVE-2026-79607.