# CVE-2026-79602: xen: A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.

CVE-2026-79602 is fixed in 15 products on 1 platform, first by SUSE-SU-2026:4090-1, released September 8, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-79602
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 8, 2026

## Description

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.

## 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-2026-79602](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79602.md) | Sep 8, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.4+39-gf1e1321c87-0+deb13u1 | [DEBIAN-CVE-2026-79602](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79602.md) | Sep 8, 2026 |
| Linux | xen Debian 14 | 4.20.4+39-gf1e1321c87-1 | [DEBIAN-CVE-2026-79602](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79602.md) | Sep 8, 2026 |
| Linux | xen Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 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 |
| Linux | xen-debuginfo Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-debugsource Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-devel Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-doc Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-hypervisor Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-libs Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-libs-debuginfo Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-licenses Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-ocaml Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-ocaml-debuginfo Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-ocaml-devel Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-ocaml-devel-debuginfo Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-runtime Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 2026 |
| Linux | xen-runtime-debuginfo Fedora 43 | 4.20.4-2.fc43 | [FEDORA-2026-A9EA805BC1](https://patchblox.com/security/data/fix/linux/fedora-2026-a9ea805bc1.md) | Sep 17, 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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