Is CVE-2026-62427 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-62427 being exploited in the wild.

How severe is CVE-2026-62427?

Informational severity, with a CVSS score of 0, published 28 July 2026.

Is there a fix for CVE-2026-62427?

A patch was published on 2026-07-28: Patches released for Xen 4.17 through 4.21 (unstable) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-62427 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-62427?

Check whether you run Xen Project Xen at an affected version. 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-2026-62427: Xen Project denial of service in platform-op locks

CVE-2026-62427 · Severity: info · CVSS 0 · Published 2026-07-28

A vulnerability in the Xen hypervisor, which is software used to run multiple virtual machines on a single physical server, could allow a user with limited privileges to interfere with more powerful administrative accounts. By exploiting how the system manages internal locks for platform operations, an attacker could cause the entire server to become unresponsive or slow down significantly. This results in a denial-of-service condition that can disrupt all services and data hosted on the affected physical hardware.

Technologies: Xen Project Xen. Vendors: Xen Project.

Quick answers

Is CVE-2026-62427 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-62427 being exploited in the wild.
How severe is CVE-2026-62427?: Informational severity, with a CVSS score of 0, published 28 July 2026.
Which products and versions are affected?: Xen Project Xen 4.0 and later.
Is there a fix for CVE-2026-62427?: A patch was published on 2026-07-28: Patches released for Xen 4.17 through 4.21 (unstable) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-62427 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-62427?: Check whether you run Xen Project Xen at an affected version. 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

A vulnerability exists in the Xen hypervisor's handling of platform operations (platform-op). The system uses system-wide locks to manage operations that cannot be executed in parallel; however, these locks lack fairness in their acquisition logic. Furthermore, when XSM/Flask is enabled, the lock is acquired before permission checks are performed. This allows a less privileged domain or entity to repeatedly acquire or contest the lock, effectively stalling more privileged entities (such as the control domain). This can lead to a host-wide Denial of Service (DoS). The issue is resolved by applying patches provided in XSA-499.

Affected products

Xen Project Xen 4.0 and later

Timeline

2026-07-28: disclosed: Public release of XSA-499
2026-07-28: patched: Patches released for Xen 4.17 through 4.21 (unstable)

References

https://xenbits.xenproject.org/xsa/advisory-499.html

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