CVE-2021-4011

NameCVE-2021-4011
DescriptionA flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
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-2869-1, DSA-5027-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xorg-server (PTS)stretch2:1.19.2-1+deb9u5vulnerable
stretch (security)2:1.19.2-1+deb9u9fixed
buster2:1.20.4-1+deb10u3vulnerable
buster (security)2:1.20.4-1+deb10u4fixed
bullseye2:1.20.11-1vulnerable
bullseye (security)2:1.20.11-1+deb11u1fixed
bookworm, sid2:1.20.14-1fixed
xwayland (PTS)bookworm, sid2:21.1.4-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xorg-serversourcestretch2:1.19.2-1+deb9u9DLA-2869-1
xorg-serversourcebuster2:1.20.4-1+deb10u4DSA-5027-1
xorg-serversourcebullseye2:1.20.11-1+deb11u1DSA-5027-1
xorg-serversource(unstable)2:1.20.13-3
xwaylandsource(unstable)2:21.1.4-1

Notes

https://lists.x.org/archives/xorg-announce/2021-December/003122.html
https://gitlab.freedesktop.org/xorg/xserver/-/commit/e56f61c79fc3cee26d83cda0f84ae56d5979f768

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