# CVE-2026-62428: xen: When grant-copy operations are processed, the respective grant may or may not already be in use by another operation...

CVE-2026-62428 is fixed in xen on 1 platform, first by SUSE-SU-2026:3409-1, released July 29, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-62428
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 28, 2026

## Description

When grant-copy operations are processed, the respective grant may or may not already be in use by another operation (a mapping or another copy). For all copy operations the referenced guest frame is looked up.  When another operation is already active for the grant (the grant is "pinned"), what is being supplied back to actually carry out permission checks and copy operation may not be consistent: The permission check may be carried out on a page different from the one involved in the copy.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | [DEBIAN-CVE-2026-62428](https://patchblox.com/security/data/fix/linux/debian-cve-2026-62428.md) | Aug 3, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | [DEBIAN-CVE-2026-62428](https://patchblox.com/security/data/fix/linux/debian-cve-2026-62428.md) | Aug 3, 2026 |
| Linux | xen Debian 14 | 4.20.3+127-gc42374a105-1 | [DEBIAN-CVE-2026-62428](https://patchblox.com/security/data/fix/linux/debian-cve-2026-62428.md) | Aug 3, 2026 |
| Linux | xen sles 15.6 | 4.18.5_20-150600.3.53.3 | [SUSE-SU-2026:3409-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3409-1.md) | Jul 29, 2026 |
| Linux | xen sles 15.7 | 4.20.4_04-150700.3.46.1 | [SUSE-SU-2026:4090-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4090-1.md) | Sep 8, 2026 |

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Data as of 2026-11-10T01:44:33Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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