CVE-2021-20257

Name	CVE-2021-20257
Description	An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles 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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2623-1, DLA-3099-1
Debian Bugs	984450

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+deb11u2	fixed
	bookworm	1:7.2+dfsg-7+deb12u12	fixed
	sid, trixie	1:9.2.2+ds-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
qemu	source	stretch	1:2.8+dfsg-6+deb9u14	DLA-2623-1
qemu	source	buster	1:3.1+dfsg-8+deb10u9	DLA-3099-1
qemu	source	(unstable)	1:5.2+dfsg-9		984450

Notes

[bullseye] - qemu <postponed> (Minor issue)
https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg03595.html
https://git.qemu.org/?p=qemu.git;a=commit;h=3de46e6fc489c52c9431a8a832ad8170a7569bd8