CVE-2021-20221

Name	CVE-2021-20221
Description	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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-2560-1
NVD severity	low

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
qemu (PTS)	stretch	1:2.8+dfsg-6+deb9u9	vulnerable
	stretch (security)	1:2.8+dfsg-6+deb9u16	fixed
	buster, buster (security)	1:3.1+dfsg-8+deb10u8	vulnerable
	bullseye (security), bullseye	1:5.2+dfsg-11+deb11u1	fixed
	bookworm	1:6.2+dfsg-1	fixed
	sid	1:6.2+dfsg-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
qemu	source	stretch	1:2.8+dfsg-6+deb9u13		DLA-2560-1
qemu	source	(unstable)	1:5.2+dfsg-4

Notes

[buster] - qemu <postponed> (Minor issue)
https://www.openwall.com/lists/oss-security/2021/02/05/1
https://gitlab.com/qemu-project/qemu/-/commit/edfe2eb4360cde4ed5d95bda7777edcb3510f76a (v6.0.0-rc0)