CVE-2019-20794

NameCVE-2019-20794
DescriptionAn issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed. A user can create their own PID namespace, and mount a FUSE filesystem. Upon interaction with this FUSE filesystem, if the userspace component is terminated via a kill of the PID namespace's pid 1, it will result in a hung task, and resources being permanently locked up until system reboot. This can result in resource exhaustion.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)buster4.19.249-2vulnerable
buster (security)4.19.304-1vulnerable
bullseye5.10.209-2vulnerable
bullseye (security)5.10.216-1vulnerable
bookworm6.1.76-1vulnerable
bookworm (security)6.1.90-1vulnerable
trixie6.7.12-1vulnerable
sid6.8.11-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)(unfixed)

Notes

[bookworm] - linux <postponed> (Minor issue, revisit when fixed upstream)
[bullseye] - linux <postponed> (Minor issue, revisit when fixed upstream)
[buster] - linux <postponed> (Minor issue, revisit when fixed upstream)
https://sourceforge.net/p/fuse/mailman/message/36598753/

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