CVE-2023-34321: Xen

Low severity, CVSS 3.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest. Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory.

Affected products

• Xen Xen: up to and including 4.16

Published 2024-01-05. Last modified 2026-06-17.