[LSN-0031-1] Linux kernel vulnerability

Benjamin M. Romer benjamin.romer at canonical.com
Tue Oct 10 15:18:20 UTC 2017


==========================================================================
Kernel Live Patch Security Notice LSN-0031-1
October 10, 2017

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       |
| Ubuntu 14.04 LTS | 4.4.0        | amd64    | generic          |
| Ubuntu 14.04 LTS | 4.4.0        | amd64    | lowlatency       |

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

net/xfrm/xfrm_policy.c in the Linux kernel through 4.12.3, when 
CONFIG_XFRM_MIGRATE is enabled, does not ensure that the dir value of 
xfrm_userpolicy_id is XFRM_POLICY_MAX or less, which allows local users to
cause a denial of service (out-of-bounds access) or possibly have unspecified
other impact via an XFRM_MSG_MIGRATE xfrm Netlink message. (CVE-2017-11600)

Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)

Update instructions:

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

| Kernel          | Version  | flavors                  |
|-----------------+----------+--------------------------|
| 4.4.0-21.37     | 31.1     | generic, lowlatency      |
| 4.4.0-22.39     | 31.1     | generic, lowlatency      |
| 4.4.0-22.40     | 31.1     | generic, lowlatency      |
| 4.4.0-24.43     | 31.1     | generic, lowlatency      |
| 4.4.0-28.47     | 31.1     | generic, lowlatency      |
| 4.4.0-31.50     | 31.1     | generic, lowlatency      |
| 4.4.0-34.53     | 31.1     | generic, lowlatency      |
| 4.4.0-36.55     | 31.1     | generic, lowlatency      |
| 4.4.0-38.57     | 31.1     | generic, lowlatency      |
| 4.4.0-42.62     | 31.1     | generic, lowlatency      |
| 4.4.0-43.63     | 31.1     | generic, lowlatency      |
| 4.4.0-45.66     | 31.1     | generic, lowlatency      |
| 4.4.0-47.68     | 31.1     | generic, lowlatency      |
| 4.4.0-51.72     | 31.1     | generic, lowlatency      |
| 4.4.0-53.74     | 31.1     | generic, lowlatency      |
| 4.4.0-57.78     | 31.1     | generic, lowlatency      |
| 4.4.0-59.80     | 31.1     | generic, lowlatency      |
| 4.4.0-62.83     | 31.1     | generic, lowlatency      |
| 4.4.0-63.84     | 31.1     | generic, lowlatency      |
| 4.4.0-64.85     | 31.1     | generic, lowlatency      |
| 4.4.0-66.87     | 31.1     | generic, lowlatency      |
| 4.4.0-67.88     | 31.1     | generic, lowlatency      |
| 4.4.0-70.91     | 31.1     | generic, lowlatency      |
| 4.4.0-71.92     | 31.1     | generic, lowlatency      |
| 4.4.0-72.93     | 31.1     | generic, lowlatency      |
| 4.4.0-75.96     | 31.1     | generic, lowlatency      |
| 4.4.0-77.98     | 31.1     | generic, lowlatency      |
| 4.4.0-78.99     | 31.1     | generic, lowlatency      |
| 4.4.0-79.100    | 31.1     | generic, lowlatency      |
| 4.4.0-81.104    | 31.1     | generic, lowlatency      |
| 4.4.0-83.106    | 31.1     | generic, lowlatency      |
| 4.4.0-87.110    | 31.1     | generic, lowlatency      |
| 4.4.0-89.112    | 31.1     | generic, lowlatency      |
| 4.4.0-91.114    | 31.1     | generic, lowlatency      |
| 4.4.0-92.115    | 31.1     | generic, lowlatency      |
| 4.4.0-93.116    | 31.1     | generic, lowlatency      |
| 4.4.0-96.119    | 31.1     | generic, lowlatency      |
| lts-4.4.0-21.37_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-22.39_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-22.40_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-24.43_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-28.47_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-31.50_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-34.53_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-36.55_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-38.57_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-42.62_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-45.66_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-47.68_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-51.72_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-53.74_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-57.78_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-59.80_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-62.83_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-63.84_14.04.2-lts-xenial | 14.04.2  | generic, lowlatency      |
| lts-4.4.0-64.85_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-66.87_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-70.91_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-71.92_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-72.93_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-75.96_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-78.99_14.04.2-lts-xenial | 14.04.2  | generic, lowlatency      |
| lts-4.4.0-79.100_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-81.104_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-87.110_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-89.112_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-91.114_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-92.115_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-96.119_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |

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

References:
  CVE-2017-11600, CVE-2017-14106



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