| Name | CVE-2016-4998 |
| Description | The IPT_SO_SET_REPLACE setsockopt implementation in the netfilter subsystem in the Linux kernel before 4.6 allows local users to cause a denial of service (out-of-bounds read) or possibly obtain sensitive information from kernel heap memory by leveraging in-container root access to provide a crafted offset value that leads to crossing a ruleset blob boundary. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| References | DSA-3607-1 |
| NVD severity | medium |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| linux (PTS) | jessie | 3.16.56-1+deb8u1 | fixed |
| jessie (security) | 3.16.81-1 | fixed |
| stretch | 4.9.210-1 | fixed |
| stretch (security) | 4.9.189-3+deb9u2 | fixed |
| buster | 4.19.98-1 | fixed |
| buster (security) | 4.19.67-2+deb10u2 | fixed |
| bullseye | 5.4.19-1 | fixed |
| sid | 5.5.13-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| linux | source | (unstable) | 4.6.2-2 | | | |
| linux | source | jessie | 3.16.7-ckt25-2+deb8u2 | | DSA-3607-1 | |
Notes
[wheezy] - linux <no-dsa> (Only exploitable by privileged user; too many changes to backport)
Non-privileged user namespaces disabled by default, only vulnerable with sysctl kernel.unprivileged_userns_clone=1