high
7.8
CWE
190 787
Advisory Published
CVE Published
Updated

CVE-2016-9755: Integer Overflow

First published: Fri Dec 02 2016(Updated: )

A flaw was found in the Linux kernel networking stack in which an attacker can create crafted fragmented IPV6 packets that require reassembly. The network header offset in the reassembly process is assumed to be located in an offset prior to the fragment in memory. In some situations during fragment reassembly the header may be reconstructed in the assumed location and overwrite kernel memory with another header. The flaw involves an issue that all network headers before fragment header are pulled. Normal ipv6 reassembly will drop the skb when errors occur further down the line. The netfilter reassembly code neglects to do this correctly and instead passed the original fragment along. That was also fine back when netfilter ipv6 defrag worked with cloned fragments, as the original, pristine fragment was passed on. An attacker on the network could use this flaw to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. References: <a href="http://seclists.org/oss-sec/2016/q4/556">http://seclists.org/oss-sec/2016/q4/556</a> <a href="https://groups.google.com/forum/#!topic/syzkaller/GFbGpX7nTEo">https://groups.google.com/forum/#!topic/syzkaller/GFbGpX7nTEo</a> Patch: <a href="https://www.spinics.net/lists/netdev/msg407525.html">https://www.spinics.net/lists/netdev/msg407525.html</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<=4.8.15
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

Remedy

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9b57da0630c9fd36ed7a20fc0f98dc82cc0777fa

Remedy

https://www.spinics.net/lists/netdev/msg407525.html

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Reference Links

Frequently Asked Questions

  • What is CVE-2016-9755?

    CVE-2016-9755 is a vulnerability in the netfilter subsystem of the Linux kernel that mishandles IPv6 reassembly, allowing local users to cause a denial of service or possibly have other unspecified impact.

  • What is the severity of CVE-2016-9755?

    CVE-2016-9755 has a severity level of medium (4) on the CVSS scale.

  • How does CVE-2016-9755 affect Linux systems?

    CVE-2016-9755 affects Linux systems running on kernel versions before 4.9.

  • How can I fix CVE-2016-9755?

    To fix CVE-2016-9755, you should update the Linux kernel to version 4.9 or later.

  • Where can I find more information about CVE-2016-9755?

    You can find more information about CVE-2016-9755 at the following references: [1] [2] [3]

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