| Name | CVE-2016-2854 |
| Description | The aufs module for the Linux kernel 3.x and 4.x does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory. |
| 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 (security), buster, buster (lts) | 4.19.316-1 | fixed |
| bullseye | 5.10.223-1 | fixed |
| bullseye (security) | 5.10.226-1 | fixed |
| bookworm | 6.1.115-1 | fixed |
| bookworm (security) | 6.1.119-1 | fixed |
| trixie | 6.12.5-1 | fixed |
| sid | 6.12.6-1 | 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) | 3.18-1~exp1 | | | |
Notes
[jessie] - linux <ignored> (Not exploitable in default configuration)
[wheezy] - linux <not-affected> (Vulnerable code is not present)
http://www.halfdog.net/Security/2016/AufsPrivilegeEscalationInUserNamespaces/
https://sourceforge.net/p/aufs/mailman/message/34864744/
This depends on a user namespace creator being able to mount aufs.
jessie: Unprivileged users are not allowed to create user namespaces by default; aufs is not allowed to be mounted from a new user namespace by default.
wheezy: User namespaces are non-functional.