CVE-2016-8655
Description
Race condition in net/packet/af_packet.c in the Linux kernel through 4.8.12 allows local users to gain privileges or cause a denial of service (use-after-free) by leveraging the CAP_NET_RAW capability to change a socket version, related to the packet_set_ring and packet_setsockopt functions.
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 4.4.0 (Ubuntu 14.04/16.04 x86-64) - 'AF_PACKET' Race Condition Privilege Escalation
Linux Kernel 4.4.0-21 < 4.4.0-51 (Ubuntu 14.04/16.04 x64) - 'AF_PACKET' Race Condition Privilege Escalation
Linux 4.4.0 < 4.4.0-53 - 'AF_PACKET chocobo_root' Local Privilege Escalation (Metasploit)
Metasploit modules
OS impact
Linux kernel Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | 3.2.85 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Ubuntu Affected 4 releases
| Version | Status | Fixed in |
|---|---|---|
| 16.10 | Affected | — |
| 16.04 | Affected | — |
| 14.04 | Affected | — |
| 12.04 | Affected | — |
Arch Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Fixed | 4.8.12-2 |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.8.15-1 |
| sid | Fixed | 4.8.15-1 |
| forky | Fixed | 4.8.15-1 |
| bullseye | Fixed | 4.8.15-1 |
| bookworm | Fixed | 4.8.15-1 |
References
- https://security.archlinux.org/ASA-201612-8
- https://security.archlinux.org/ASA-201612-7
- https://security.archlinux.org/ASA-201612-6
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=84ac7260236a49c79eede91617700174c2c19b0c
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00054.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00055.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00056.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00067.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00070.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00073.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00076.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00077.html
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00087.html
- http://packetstormsecurity.com/files/140063/Linux-Kernel-4.4.0-AF_PACKET-Race-Condition-Privilege-Escalation.html
- http://rhn.redhat.com/errata/RHSA-2017-0386.html
- http://rhn.redhat.com/errata/RHSA-2017-0387.html
- http://rhn.redhat.com/errata/RHSA-2017-0402.html
- http://www.openwall.com/lists/oss-security/2016/12/06/1
- http://www.securityfocus.com/bid/94692
- http://www.securitytracker.com/id/1037403
- http://www.securitytracker.com/id/1037968
- http://www.ubuntu.com/usn/USN-3149-1
- http://www.ubuntu.com/usn/USN-3149-2
- http://www.ubuntu.com/usn/USN-3150-1
CWEs
CWE-362 CWE-416
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.