CVE-2026-62428 grant-table: type confusion in grant-copy
A race condition in Xen's grant-copy allows attackers to bypass permission checks, potentially leading to privilege escalation or unauthorized data access.
- 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-2026-62428?
CVE-2026-62428 is a high-severity vulnerability in Xen, published on 28 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
When grant-copy operations are processed, the respective grant may or may not already be in use by another operation (a mapping or another copy). For all copy operations the referenced guest frame is looked up. When another operation is already active for the grant (the grant is "pinned"), what is being supplied back to actually carry out permission checks and copy operation may not be consistent: The permission check may be carried out on a page different from the one involved in the copy.
Weakness: CWE-367
Which versions are affected by CVE-2026-62428?
How do I fix CVE-2026-62428?
Apply the vendor's patch.
Is CVE-2026-62428 being exploited?
There is no known exploitation of CVE-2026-62428 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-62428, DEBIAN-CVE-2026-62428, GHSA-qmxg-rhxf-8273, UBUNTU-CVE-2026-62428.