CVE-2022-0185

NameCVE-2022-0185
DescriptionA heap-based buffer overflow flaw was found in the way the legacy_parse_param function in the Filesystem Context functionality of the Linux kernel verified the supplied parameters length. An unprivileged (in case of unprivileged user namespaces enabled, otherwise needs namespaced CAP_SYS_ADMIN privilege) local user able to open a filesystem that does not support the Filesystem Context API (and thus fallbacks to legacy handling) could use this flaw to 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 code/issues, web search, more)
ReferencesDSA-5050-1
NVD severityhigh

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1fixed
stretch (security)4.9.303-1fixed
buster4.19.235-1fixed
buster (security)4.19.232-1fixed
bullseye5.10.106-1fixed
bullseye (security)5.10.113-1fixed
bookworm5.17.3-1fixed
sid5.17.6-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch(not affected)
linuxsourcebuster(not affected)
linuxsourcebullseye5.10.92-1DSA-5050-1
linuxsource(unstable)5.15.15-1

Notes

[buster] - linux <not-affected> (Vulnerable code introduced later)
[stretch] - linux <not-affected> (Vulnerable code introduced later)
Fixed by: https://git.kernel.org/linus/722d94847de29310e8aa03fcbdb41fc92c521756
https://www.openwall.com/lists/oss-security/2022/01/18/7
https://www.openwall.com/lists/oss-security/2022/01/25/14
https://www.willsroot.io/2022/01/cve-2022-0185.html

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