CVE-2026-62432

Description

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.

CVSS Vector

References

• https://xenbits.xenproject.org/xsa/advisory-505.html
• http://www.openwall.com/lists/oss-security/2026/07/28/21
• http://xenbits.xen.org/xsa/advisory-505.html