[LSN-0013-1] Linux kernel vulnerability

[Luis Henriques]

==========================================================================
Kernel Live Patch Security Notice LSN-0013-1
November 30, 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:

Ondrej Kozina discovered that the keyring interface in the Linux kernel
contained a buffer overflow when displaying timeout events via the
/proc/keys interface. A local attacker could use this to cause a denial of
service (system crash). (CVE-2016-7042)

Dmitry Vyukov discovered a use-after-free vulnerability during error
processing in the recvmmsg(2) implementation in the Linux kernel. A remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2016-7117)

Marco Grassi discovered that the driver for Areca RAID Controllers in the
Linux kernel did not properly validate control messages. A local attacker
could use this to cause a denial of service (system crash) or possibly gain
privileges. (CVE-2016-7425)

Daxing Guo discovered a stack-based buffer overflow in the Broadcom
IEEE802.11n FullMAC driver in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or possibly gain
privileges. (CVE-2016-8658)

Update instructions:

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

| Kernel          | Version  | flavors                  |
|-----------------+----------+--------------------------|
| 4.4.0-21.37     | 14.1     | generic, lowlatency      |
| 4.4.0-22.39     | 14.1     | generic, lowlatency      |
| 4.4.0-22.40     | 14.1     | generic, lowlatency      |
| 4.4.0-24.43     | 14.1     | generic, lowlatency      |
| 4.4.0-28.47     | 14.1     | generic, lowlatency      |
| 4.4.0-31.50     | 14.1     | generic, lowlatency      |
| 4.4.0-34.53     | 14.1     | generic, lowlatency      |
| 4.4.0-36.55     | 14.1     | generic, lowlatency      |
| 4.4.0-38.57     | 14.1     | generic, lowlatency      |
| 4.4.0-42.62     | 14.1     | generic, lowlatency      |
| 4.4.0-43.63     | 14.1     | generic, lowlatency      |
| 4.4.0-45.66     | 14.1     | generic, lowlatency      |
| 4.4.0-47.68     | 14.1     | generic, lowlatency      |

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

References:
  CVE-2016-7042, CVE-2016-7117, CVE-2016-7425, CVE-2016-8658
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