Race condition in Xen - CVE-2026-62432
Published: July 29, 2026
Vulnerability identifier: #VU140015
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-62432
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Affected software:
Xen
Xen
Detailed vulnerability description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a race condition in the EVTCHNOP_expand_array hypercall when checking whether FIFO event channels are enabled without holding the correct lock. A local attacker can trigger EVTCHNOP_expand_array to race with EVTCHNOP_reset to cause a denial of service.
The issue affects malicious guest contexts, including HVM guests on x86 or ARM and PVH guests; x86 PV guests may also be able to trigger memory corruption or privilege escalation.
How to mitigate CVE-2026-62432
Install security update from vendor's website.