CVE-2019-20808

An out-of-bounds read flaw was found in the ATI VGA implementation of the QEMU emulator. This flaw occurs in the ati_cursor_define() routine while handling MMIO write operations through ati_mm_write() callback. A malicious guest could abuse this flaw to crash the QEMU process, resulting in a denial of service.

This flaw did not affect the following versions of QEMU as they did not include support for ATI VGA emulation:

• qemu-kvm-ma as shipped with Red Hat Enterprise Linux 7.
• qemu-kvm-rhev as shipped with Red Hat Virtualization and Red Hat OpenStack.
• qemu-kvm as shipped with Red Hat Enterprise Linux 6, 7 and 8.
• virt:8.2/qemu-kvm as shipped with RHEL Advanced Virtualization.

ATI VGA emulation feature was introduced in QEMU upstream version 4.0.0.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.