CVE-2024-31143: Xen

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

An optional feature of PCI MSI called "Multiple Message" allows a device to use multiple consecutive interrupt vectors. Unlike for MSI-X, the setting up of these consecutive vectors needs to happen all in one go. In this handling an error path could be taken in different situations, with or without a particular lock held. This error path wrongly releases the lock even when it is not currently held.

Affected products

• Xen Xen: from 4.4.0

Published 2024-07-18. Last modified 2026-06-17.