CVE-2021-33909

NameCVE-2021-33909
Descriptionfs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
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-2713-1, DLA-2714-1, DSA-4941-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.272-2fixed
buster4.19.194-1vulnerable
buster (security)4.19.194-3fixed
bullseye5.10.46-2fixed
sid5.10.46-3fixed
linux-4.19 (PTS)stretch (security)4.19.194-3~deb9u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch4.9.272-2DLA-2713-1
linuxsourcebuster4.19.194-3DSA-4941-1
linuxsource(unstable)5.10.46-2
linux-4.19sourcestretch4.19.194-3~deb9u1DLA-2714-1

Notes

https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt
https://git.kernel.org/linus/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b

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