# CVE-2026-42493: xen: Addressing certain issues, in particular related to operations which may take excessively long and therefore would ne...

CVE-2026-42493 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-2026-42493
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 28, 2026

## Description

Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk.  Memory-wise small enough guests may still be okay to run.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | [DEBIAN-CVE-2026-42493](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42493.md) | Aug 3, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | [DEBIAN-CVE-2026-42493](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42493.md) | Aug 3, 2026 |
| Linux | xen Debian 14 | 4.20.3+127-gc42374a105-1 | [DEBIAN-CVE-2026-42493](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42493.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 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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