Vulnerability · Published Oct 13, 2026 · Assigned by XEN
CVE-2026-102700gnttab: cache-flush handling may cause page reference leak
Medium 4.7
In plain English
A medium-severity security flaw in Xen from Xen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.)
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | xen | 4.19.6-r2 | ALPINE-CVE-2026-102700 |
| Alpine:v3.22 | xen | 4.20.4-r2 | ALPINE-CVE-2026-102700 |
| Alpine:v3.23 | xen | 4.20.4-r2 | ALPINE-CVE-2026-102700 |
| Debian:12 | xen | 4.17.7+13-g2445b30a44-0+deb12u1 | DEBIAN-CVE-2026-102700 |
| Debian:13 | xen | 4.20.4+39-gf1e1321c87-0+deb13u1 | DEBIAN-CVE-2026-102700 |
| Debian:14 | xen | 4.20.4+39-gf1e1321c87-1 | DEBIAN-CVE-2026-102700 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-102700 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-102700 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-102700 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2026-102700 |
Affected products (as reported)
Weakness: CWE-404 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H