CVE-2020-28941

Name	CVE-2020-28941
Description	An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9. Local attackers on systems with the speakup driver could cause a local denial of service attack, aka CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
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-2483-1
NVD severity	medium

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	stretch	4.9.228-1	fixed
	stretch (security)	4.9.246-2	fixed
	buster, buster (security)	4.19.171-2	fixed
	bullseye	5.10.13-1	fixed
	sid	5.10.19-1	fixed
linux-4.19 (PTS)	stretch (security)	4.19.171-2~deb9u1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	stretch	(not affected)
linux	source	buster	4.19.160-1
linux	source	(unstable)	5.9.11-1
linux-4.19	source	stretch	4.19.160-2~deb9u1	DLA-2483-1

[stretch] - linux <not-affected> (Vulnerable code not present)
https://www.openwall.com/lists/oss-security/2020/11/19/3