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, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2560-1, DLA-3099-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
qemu (PTS)	bullseye	1:5.2+dfsg-11+deb11u3	fixed
	bullseye (security)	1:5.2+dfsg-11+deb11u5	fixed
	bookworm	1:7.2+dfsg-7+deb12u16	fixed
	bookworm (security)	1:7.2+dfsg-7+deb12u15	fixed
	trixie	1:10.0.3+ds-0+deb13u1	fixed
	trixie (security)	1:10.0.2+ds-2+deb13u1	fixed
	forky	1:10.1.0+ds-2	fixed
	sid	1:10.1.0+ds-5	fixed

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

Package	Type	Release	Fixed Version	Origin
qemu	source	stretch	1:2.8+dfsg-6+deb9u13	DLA-2560-1
qemu	source	buster	1:3.1+dfsg-8+deb10u9	DLA-3099-1
qemu	source	(unstable)	1:5.2+dfsg-4

Notes

https://www.openwall.com/lists/oss-security/2021/02/05/1
https://gitlab.com/qemu-project/qemu/-/commit/edfe2eb4360cde4ed5d95bda7777edcb3510f76a (v6.0.0-rc0)