| Name | CVE-2019-20794 |
| Description | An 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. |
| Source | CVE (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 Package | Release | Version | Status |
|---|
| linux (PTS) | jessie, jessie (lts) | 3.16.84-1 | vulnerable |
| stretch (security) | 4.9.320-2 | vulnerable |
| stretch (lts), stretch | 4.9.320-3 | vulnerable |
| buster (security), buster, buster (lts) | 4.19.316-1 | vulnerable |
| bullseye | 5.10.223-1 | vulnerable |
| bullseye (security) | 5.10.226-1 | vulnerable |
| bookworm | 6.1.115-1 | vulnerable |
| bookworm (security) | 6.1.112-1 | vulnerable |
| trixie | 6.11.7-1 | vulnerable |
| sid | 6.11.9-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| linux | source | wheezy | (unfixed) | end-of-life | | |
| linux | source | jessie | (unfixed) | end-of-life | | |
| linux | source | stretch | (unfixed) | end-of-life | | |
| linux | source | (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/