XEN Hypervisor Null Pointer Deref via EVTCHNOP_expand_array Race
CVE-2026-62432 Published on July 28, 2026
evtchn: Race between FIFO expand and reset
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 Analysis
CVE-2026-62432 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
What is a Race Condition Vulnerability?
The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.
CVE-2026-62432 has been classified to as a Race Condition vulnerability or weakness.
Products Associated with CVE-2026-62432
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