CVE-2026-62430

Summary

Accesses to the CMOS memory contents are done using an indirect IO port pair. Therefore Xen needs to cache the guest chosen index, and one of the usages of the index didn't take the necessary locking to avoid concurrent changes. As a result, a guest could change the index after it being checked, causing a subsequent out-of-bound read access to the contents of an array.

Affected Software

Weaknesses

Workarounds

Running only PV or PVH guests will avoid the vulnerability.

ADP Enrichment

CVE Program Container

Additional References

• http://xenbits.xen.org/xsa/advisory-503.html
• http://www.openwall.com/lists/oss-security/2026/07/28/19

CISA ADP Vulnrichment

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

References

• https://xenbits.xenproject.org/xsa/advisory-503.html

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