CVE-2026-62430 — x86: Out-of-bounds read in vRTC emulation
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 tak…
Published: 2026-07-28 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7