CVE-2026-62432 — evtchn: Race between FIFO expand and reset

CVE-2026-62432

evtchn: Race between FIFO expand and reset PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Xen / Xen	unknown consult Xen advisory XSA-505

CWE

No CWE identifiers supplied.

References

https://xenbits.xenproject.org/xsa/advisory-505.html

ADP enrichment

CVE

No English description supplied.

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

CISA-ADP

No English description supplied.

No references supplied.