CVE-2021-4197

NameCVE-2021-4197
DescriptionAn unprivileged write to the file handler flaw in the Linux kernel's control groups and namespaces subsystem was found in the way users have access to some less privileged process that are controlled by cgroups and have higher privileged parent process. It is actually both for cgroup2 and cgroup1 versions of control groups. A local user could use this flaw to crash the system or escalate their privileges on the system.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
ReferencesDSA-5127-1, DSA-5173-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)buster, buster (security)4.19.249-2fixed
bullseye5.10.140-1fixed
bullseye (security)5.10.136-1fixed
bookworm5.19.6-1fixed
sid5.19.11-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcebuster4.19.249-2DSA-5173-1
linuxsourcebullseye5.10.113-1DSA-5127-1
linuxsource(unstable)5.15.15-1

Notes

https://lore.kernel.org/lkml/20211209214707.805617-1-tj@kernel.org/T/
https://bugzilla.redhat.com/show_bug.cgi?id=2035652

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