What is CVE-2026-62432?

CVE-2026-62432 is a high-severity vulnerability in Xen, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.3/10. Published 2026-07-28.

How severe is CVE-2026-62432?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Xen

CVE-2026-62432

The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the correct lock. It can race with EVTCHNOP_reset, resulting in dereferencing a NULL pointer.

Vulnerability class: Race Condition

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Xen — versions consult Xen advisory XSA-505

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

security@xen.org
af854a3a-2127-422b-91ae-364da2661108
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-62432?: CVE-2026-62432 is a high-severity vulnerability in Xen, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.3/10. Published 2026-07-28.
How severe is CVE-2026-62432?: High severity. CVSS v3 base score is 7.3 out of 10.