CVE-2016-0728
Description
The join_session_keyring function in security/keys/process_keys.c in the Linux kernel before 4.4.1 mishandles object references in a certain error case, which allows local users to gain privileges or cause a denial of service (integer overflow and use-after-free) via crafted keyctl commands.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Linux Kernel 4.4.1 - REFCOUNT Overflow Use-After-Free in Keyrings Local Privilege Escalation (1)
Linux Kernel 4.4.1 - REFCOUNT Overflow Use-After-Free in Keyrings Local Privilege Escalation (2)
OS impact
Linux kernel Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | 3.10.95 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Ubuntu Affected 4 releases
| Version | Status | Fixed in |
|---|---|---|
| 15.10 | Affected | — |
| 15.04 | Affected | — |
| 14.04 | Affected | — |
| 12.04 | Affected | — |
Debian Mixed 6 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.3.3-6 |
| sid | Fixed | 4.3.3-6 |
| forky | Fixed | 4.3.3-6 |
| bullseye | Fixed | 4.3.3-6 |
| bookworm | Fixed | 4.3.3-6 |
| 8.0 | Affected | — |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| hp | server_migration_pack | {"endIncluding":"7.5"} | |
References
- https://www.suse.com/security/cve/CVE-2016-0728.html
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=23567fd052a9abb6d67fe8e7a9ccdd9800a540f2
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176484.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176194.html
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00026.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00012.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00033.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00034.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00035.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00038.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00039.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00040.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00043.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00045.html
- http://perception-point.io/2016/01/14/analysis-and-exploitation-of-a-linux-kernel-vulnerability-cve-2016-0728/
- http://rhn.redhat.com/errata/RHSA-2016-0064.html
- http://rhn.redhat.com/errata/RHSA-2016-0065.html
- http://rhn.redhat.com/errata/RHSA-2016-0068.html
- http://source.android.com/security/bulletin/2016-03-01.html
- http://www.debian.org/security/2016/dsa-3448
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1
- http://www.openwall.com/lists/oss-security/2016/01/19/2
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.