CVE-2026-62432

Summary

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 Software

Weaknesses

Workarounds

There are no mitigations.

ADP Enrichment

CVE Program Container

Additional References

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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

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

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