CVE-2026-81627: Red Hat Enterprise Linux 10

High severity, CVSS 8.2. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the writable RAM alias remains within the option ROM window. A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset D_LCK protection and injecting code into System Management Mode memory.

Affected products

• Red Hat Red Hat Enterprise Linux 10
• Red Hat Red Hat Enterprise Linux 6
• Red Hat Red Hat Enterprise Linux 7
• Red Hat Red Hat Enterprise Linux 8
• Red Hat Red Hat Enterprise Linux 9
• Red Hat Red Hat Enterprise Linux For NVIDIA 26
• Red Hat Red Hat Openshift Container Platform 4
• Red Hat Red Hat Openstack Platform 13 Queens

Published 2026-09-18. Last modified 2026-09-21.