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Kernel Live Patch Security Notice LSN-0013-1

Kernel Live Patch Security Notice LSN-0013-1
Posted Nov 30, 2016
Authored by Luis Henriques

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). 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. Various other kernel vulnerabilities were also discovered and addressed.

tags | advisory, remote, denial of service, overflow, arbitrary, kernel, local, vulnerability
systems | linux
advisories | CVE-2016-7042, CVE-2016-7117, CVE-2016-7425, CVE-2016-8658
SHA-256 | 5eae3cc7ae9949b636e16234a44d66f6ecfbbb7d410b77b7636cc74cb28cfc31

Kernel Live Patch Security Notice LSN-0013-1

Change Mirror Download
==========================================================================
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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