CVE-2020-28974

NameCVE-2020-28974
DescriptionA slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to read privileged information or potentially crash the kernel, aka CID-3c4e0dff2095. This occurs because KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for manipulations such as font height.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2483-1, DLA-2494-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.258-1fixed
buster4.19.181-1fixed
buster (security)4.19.171-2fixed
bullseye, sid5.10.28-1fixed
linux-4.19 (PTS)stretch (security)4.19.181-1~deb9u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch4.9.246-1DLA-2494-1
linuxsourcebuster4.19.160-1
linuxsource(unstable)5.9.9-1
linux-4.19sourcestretch4.19.160-2~deb9u1DLA-2483-1

Notes

https://git.kernel.org/linus/3c4e0dff2095c579b142d5a0693257f1c58b4804
https://www.openwall.com/lists/oss-security/2020/11/09/2

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