Quick answers
- Is CVE-2026-62432 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-62432 being exploited in the wild.
- How severe is CVE-2026-62432?
- Informational severity, with a CVSS score of 0, published 28 July 2026.
- Which products and versions are affected?
- Xen Project Xen 4.5 and later.
- Is there a fix for CVE-2026-62432?
- A patch was published on 2026-07-28. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-62432 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-62432?
- 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 race condition exists in the Xen hypervisor between the EVTCHNOP_expand_array and EVTCHNOP_reset hypercalls. The expand_array operation checks if FIFO event channels are enabled without holding the necessary lock, allowing a concurrent reset operation to clear state. This results in a NULL pointer dereference when the expand operation proceeds. For HVM and ARM guests, this leads to a host crash (DoS). For x86 PV guests, while a crash is the most likely outcome, the Xen Project notes that memory corruption or privilege escalation cannot be entirely ruled out. The issue affects Xen versions 4.5 and later.
Affected products
- Xen Project Xen 4.5 and later
Timeline
- 2026-07-28: disclosed
- 2026-07-28: advisory
- 2026-07-28: patched