[LSN-0045-1] Linux kernel vulnerability

[benjamin.romer at canonical.com]

==========================================================================
Kernel Live Patch Security Notice 0045-1
November 13, 2018

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

A security issue affects these releases of Ubuntu:

| Series           | Base kernel  | Arch     | flavors          |
|------------------+--------------+----------+------------------|
| Ubuntu 14.04 LTS | 4.4.0        | amd64    | generic          |
| Ubuntu 14.04 LTS | 4.4.0        | amd64    | lowlatency       |
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | generic          |
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | lowlatency       |

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

It was discovered that the generic SCSI driver in the Linux kernel did not
properly enforce permissions on kernel memory access. A local attacker
could use this to expose sensitive information or possibly elevate
privileges. (CVE-2017-13168)

Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)

It was discovered that an integer overflow existed in the HID Bluetooth
implementation in the Linux kernel that could lead to a buffer overwrite.
An attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-9363)

It was discovered that an integer overflow existed in the CD-ROM driver of
the Linux kernel. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2018-16658)

Update instructions:

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

| Kernel                   | Version  | flavors                  |
|--------------------------+----------+--------------------------|
| 4.4.0-133.159            | 45.1     | generic, lowlatency      |
| 4.4.0-133.159~14.04.1    | 45.1     | lowlatency, generic      |
| 4.4.0-134.160            | 45.1     | generic, lowlatency      |
| 4.4.0-134.160~14.04.1    | 45.1     | lowlatency, generic      |
| 4.4.0-135.161~14.04.1    | 45.1     | lowlatency, generic      |
| 4.4.0-137.163~14.04.1    | 45.1     | generic, lowlatency      |
| 4.4.0-138.164            | 45.1     | generic, lowlatency      |
| 4.4.0-138.164~14.04.1    | 45.1     | lowlatency, generic      |
| 4.15.0-32.35             | 45.1     | lowlatency, generic      |
| 4.15.0-32.35~16.04.1     | 45.1     | generic, lowlatency      |
| 4.15.0-33.36             | 45.1     | lowlatency, generic      |
| 4.15.0-33.36~16.04.1     | 45.1     | lowlatency, generic      |
| 4.15.0-34.37             | 45.1     | generic, lowlatency      |
| 4.15.0-34.37~16.04.1     | 45.1     | lowlatency, generic      |
| 4.15.0-36.39             | 45.1     | generic, lowlatency      |
| 4.15.0-36.39~16.04.1     | 45.1     | generic, lowlatency      |
| 4.15.0-38.41             | 45.1     | lowlatency, generic      |
| 4.15.0-38.41~16.04.1     | 45.1     | lowlatency, generic      |

References:
  CVE-2017-13168, CVE-2018-10880, CVE-2018-9363, CVE-2018-16658