CVE-2020-35503

Name	CVE-2020-35503
Description	A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
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)
NVD severity	low
Debian Bugs	979678

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	vulnerable
	buster, buster (security)	1:3.1+dfsg-8+deb10u8	vulnerable
	bullseye	1:5.2+dfsg-11	vulnerable
	bookworm, sid	1:6.1+dfsg-5	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
qemu	source	(unstable)	(unfixed)			979678

Notes

[bullseye] - qemu <postponed> (Minor issue)
[buster] - qemu <postponed> (Fix along in future DSA)
[stretch] - qemu <postponed> (Fix along in future DLA)
https://bugzilla.redhat.com/show_bug.cgi?id=1910346