Vulnerability · Published Nov 4, 2026 · Assigned by XEN
CVE-2026-102704arbitrary read/write via grant copy
Medium 4.4
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
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] A common access pattern is a batch of Grant Copy operations acting on adjacent address ranges in the same source or destination page. For performance reasons, Xen caches details internally to reuse already validated data. The conditions on when to re-validate the internal data were not correct in some cases: - Frame numbers and grant references could wrongly be mixed up. This is CVE-2026-102703. - Copying by frame number (rather than grant reference) is permitted only when operating on the caller's own memory. The check to enforce this restriction was misplaced. This is CVE-2026-102704.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | xen | 4.19.6-r3 | ALPINE-CVE-2026-102704 |
| Alpine:v3.22 | xen | 4.20.4-r3 | ALPINE-CVE-2026-102704 |
| Alpine:v3.23 | xen | 4.20.4-r3 | ALPINE-CVE-2026-102704 |
| Alpine:v3.24 | xen | 4.21.2-r3 | ALPINE-CVE-2026-102704 |
| Debian:12 | xen | 4.17.7+13-g2445b30a44-0+deb12u1 | DEBIAN-CVE-2026-102704 |
| Debian:13 | xen | 4.20.4+63-g7abfd2bce2-0+deb13u1 | DEBIAN-CVE-2026-102704 |
| Debian:14 | xen | no fix listed | DEBIAN-CVE-2026-102704 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-102704 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-102704 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-102704 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2026-102704 |
Affected products (as reported)
Weakness: CWE-693 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N