# CVE-2026-102704: xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...

CVE-2026-102704 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-102704, released November 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-102704
- Priority: Routine
- CVSS: 4.4 (medium)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 3, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.7+13-g2445b30a44-0+deb12u1 | [DEBIAN-CVE-2026-102704](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102704.md) | Nov 5, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.4+63-g7abfd2bce2-0+deb13u1 | [DEBIAN-CVE-2026-102704](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102704.md) | Nov 5, 2026 |
| Linux | xen sles 15.7 | 4.20.4_08-150700.3.52.1 | [SUSE-SU-2026:5087-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5087-1.md) | Nov 7, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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