| Name | CVE-2014-9717 |
| Description | fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace. |
| 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 | fixed |
| stretch (lts), stretch | 4.9.320-3 | fixed |
| buster | 4.19.249-2 | fixed |
| buster (security) | 4.19.304-1 | fixed |
| bullseye | 5.10.209-2 | fixed |
| bullseye (security) | 5.10.205-2 | fixed |
| bookworm | 6.1.76-1 | fixed |
| bookworm (security) | 6.1.85-1 | fixed |
| trixie | 6.6.15-2 | fixed |
| sid | 6.7.12-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| linux | source | wheezy | (not affected) | | | |
| linux | source | (unstable) | 4.0.2-1 | low | | |
| linux-2.6 | source | (unstable) | (not affected) | | | |
Notes
[jessie] - linux <ignored> (Too intrusive to backport)
[wheezy] - linux <not-affected> (user namespaces known broken before 3.5, see kernel-sec info)
- linux-2.6 <not-affected> (user namespaces known broken before 3.5, see kernel-sec info)
https://groups.google.com/forum/#!topic/linux.kernel/HnegnbXk0Vs
Proposed fixes: http://www.spinics.net/lists/linux-containers/msg30786.html
https://www.openwall.com/lists/oss-security/2015/04/17/4
CVE assignement for issue in http://marc.info/?l=linux-kernel&m=141271552117745&w=2