# CVE-2026-102700: xen: With its original introduction, GNTTAB_cache_flush was made available uniformly

CVE-2026-102700 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-102700, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-102700
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 13, 2026

## 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.)

## 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-2026-102700](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102700.md) | Oct 19, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.4+39-gf1e1321c87-0+deb13u1 | [DEBIAN-CVE-2026-102700](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102700.md) | Oct 19, 2026 |
| Linux | xen Debian 14 | 4.20.4+39-gf1e1321c87-1 | [DEBIAN-CVE-2026-102700](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102700.md) | Oct 19, 2026 |
| Linux | xen sles 15.7 | 4.20.4_06-150700.3.49.2 | [SUSE-SU-2026:4942-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4942-1.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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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