CVE-2026-62430

CVE-2026-62430 affects the Xen hypervisor (x86) in the vRTC emulation. Accesses to CMOS memory use an indirect IO port pair; Xen caches the guest-selected index but one usage of the index lacks proper locking, allowing a guest to change the index after it is checked and trigger a subsequent out-o...

x86: Out-of-bounds read in vRTC emulation

ISSUE DESCRIPTION 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 ...