CVE-2026-102700 gnttab: cache-flush handling may cause page reference leak
A page reference leak in Xen's grant table cache flush handling can lead to resource exhaustion and 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-2026-102700?
CVE-2026-102700 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
With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)
Weakness: CWE-404
Which versions are affected by CVE-2026-102700?
How do I fix CVE-2026-102700?
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-2026-102700 being exploited?
There is no known exploitation of CVE-2026-102700 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-102700, DEBIAN-CVE-2026-102700, GHSA-hwfh-h726-49f6, UBUNTU-CVE-2026-102700.