CVE-2016-9755

Published: 28 December 2016

The netfilter subsystem in the Linux kernel before 4.9 mishandles IPv6 reassembly, which allows local users to cause a denial of service (integer overflow, out-of-bounds write, and GPF) or possibly have unspecified other impact via a crafted application that makes socket, connect, and writev system calls, related to net/ipv6/netfilter/nf_conntrack_reasm.c and net/ipv6/netfilter/nf_defrag_ipv6_hooks.c.

From the Ubuntu Security Team

Dmitry Vyukov, Andrey Konovalov, Florian Westphal, and Eric Dumazet discovered that the netfiler subsystem in the Linux kernel mishandled IPv6 packet reassembly. A local user could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Status

Severity score breakdown

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9755
• https://groups.google.com/forum/#!topic/syzkaller/GFbGpX7nTEo
• https://www.spinics.net/lists/netdev/msg407525.html
• https://ubuntu.com/security/notices/USN-3359-1
• https://ubuntu.com/security/notices/USN-3361-1
• NVD
• Launchpad
• Debian