# CVE-2026-79610: xen: XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations

CVE-2026-79610 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-79610, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-79610
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 13, 2026

## Description

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations.  Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed.  During the second change they would be allocated again.  Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

## 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-2026-79610](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79610.md) | Oct 19, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.4+39-gf1e1321c87-0+deb13u1 | [DEBIAN-CVE-2026-79610](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79610.md) | Oct 19, 2026 |
| Linux | xen Debian 14 | 4.20.4+39-gf1e1321c87-1 | [DEBIAN-CVE-2026-79610](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79610.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 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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