Is CVE-2026-79602 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-79602 being exploited in the wild.

How severe is CVE-2026-79602?

High severity, with a CVSS score of 8.8, published 8 September 2026.

Is there a fix for CVE-2026-79602?

A patch was published on 2026-09-08: Patch xsa510.patch available Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-79602 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2026-79602?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-79602: Xen improper HVM emulation return code handling

CVE-2026-79602 · Severity: high · CVSS 8.8 · Published 2026-09-08

Xen is a virtualization platform that runs multiple isolated operating systems on a single physical host. A flaw in how Xen handles PCI device passthrough to virtual machines allows an unprivileged guest to crash the entire host. An attacker with control over a guest virtual machine could exploit this to cause a complete denial of service to all running guests and the host itself.

Quick answers

Is CVE-2026-79602 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-79602 being exploited in the wild.
How severe is CVE-2026-79602?: High severity, with a CVSS score of 8.8, published 8 September 2026.
Which products and versions are affected?: Xen Xen 4.6 and later.
Is there a fix for CVE-2026-79602?: A patch was published on 2026-09-08: Patch xsa510.patch available Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-79602 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-79602?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This vulnerability is a logic error in x86 HVM emulation return code handling within Xen. When a PCI device with at least one BAR (Base Address Register) in IO port space is passed through to an HVM guest, the guest can trigger a BUG() exception in the hypervisor via improper emulation return code processing. The attack is triggered from unprivileged guest context and requires the guest to have a PCI device with IO BARs assigned. Exploitation results in a host-level denial of service affecting all guests. A patch is available via XSA-510; Xen versions 4.6 and later on x86 systems are vulnerable (Arm systems are unaffected).

Affected products

Xen Xen 4.6 and later

Timeline

2026-09-08: disclosed
2026-09-08: patched: Patch xsa510.patch available

References

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