CVE-2021-20221

An out-of-bounds heap buffer access issue was found in the ARM Generic
Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on
aarch64 platform. The issue occurs because while writing an interrupt ID to
the controller memory area, it is not masked to be 4 bits wide. It may lead
to the said issue while updating controller state fields and their
subsequent processing. A privileged guest user may use this flaw to crash
the QEMU process on the host resulting in DoS scenario.

Bugs

• <https://bugs.launchpad.net/qemu/+bug/1914353&gt;