CVE-2026-62431 Viridian STIMER division by zero
A division by zero in Xen's Viridian STIMER handling allows attackers to cause a denial of service via a #DE fault.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-62431?
CVE-2026-62431 is a high-severity denial of service vulnerability in Xen, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-controlled divisor value, that can be set to zero to cause a #DE fault.
Weakness: CWE-369
Which versions are affected by CVE-2026-62431?
How do I fix CVE-2026-62431?
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-2026-62431 being exploited?
There is no known exploitation of CVE-2026-62431 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-62431, DEBIAN-CVE-2026-62431, GHSA-248q-w8jq-jxj9, UBUNTU-CVE-2026-62431.