[LSN-0012-1] Linux kernel vulnerability

[Luis Henriques]

==========================================================================
Kernel Live Patch Security Notice LSN-0012-1
October 20, 2016

linux vulnerability
==========================================================================

A security issue affects these releases of Ubuntu:

| Series           | Base kernel  | Arch     | flavors          |
|------------------+--------------+----------+------------------|
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Vladimír Beneš discovered an unbounded recursion in the VLAN and TEB
Generic Receive Offload (GRO) processing implementations in the Linux
kernel, A remote attacker could use this to cause a stack corruption,
leading to a denial of service (system crash). (CVE-2016-7039, CVE-2016-8666)

It was discovered that a race condition existed in the memory manager of
the Linux kernel when handling copy-on-write breakage of private read-only
memory mappings. A local attacker could use this to gain administrative
privileges. (CVE-2016-5195)

Update instructions:

The problem can be corrected by updating your livepatches to the following
versions:

| Kernel          | Version  | flavors                  |
|-----------------+----------+--------------------------|
| 4.4.0-21.37     | 13.3     | generic, lowlatency      |
| 4.4.0-22.39     | 13.3     | generic, lowlatency      |
| 4.4.0-22.40     | 13.3     | generic, lowlatency      |
| 4.4.0-24.43     | 13.3     | generic, lowlatency      |
| 4.4.0-28.47     | 13.3     | generic, lowlatency      |
| 4.4.0-31.50     | 13.3     | generic, lowlatency      |
| 4.4.0-34.53     | 13.3     | generic, lowlatency      |
| 4.4.0-36.55     | 13.3     | generic, lowlatency      |
| 4.4.0-38.57     | 13.3     | generic, lowlatency      |
| 4.4.0-42.62     | 13.3     | generic, lowlatency      |
| 4.4.0-43.63     | 13.3     | generic, lowlatency      |

Additionally, you should install an updated kernel with these fixes and
reboot at your convienience.

References:
  CVE-2016-7039, CVE-2016-8666, CVE-2016-5195
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