[LSN-0059-1] Linux kernel vulnerability

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[LSN-0059-1] Linux kernel vulnerability

Benjamin M Romer
==========================================================================
Kernel Live Patch Security Notice 0059-1
November 12, 2019

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

A security issue affects these releases of Ubuntu:

| Series           | Base kernel  | Arch     | flavors          |
|------------------+--------------+----------+------------------|
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | aws              |
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | generic          |
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | lowlatency       |
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | oem              |
| Ubuntu 18.04 LTS | 5.0.0        | amd64    | azure            |
| 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    | aws              |
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |
| Ubuntu 16.04 LTS | 4.15.0       | amd64    | azure            |
| Ubuntu 16.04 LTS | 4.15.0       | amd64    | generic          |
| Ubuntu 16.04 LTS | 4.15.0       | amd64    | lowlatency       |

Summary:

On November 12, fixes for several high-severity Intel processor CVEs were
released into the Ubuntu kernel, accompanied by a related processor microcode
update. Due to the high complexity of the fixes and the required microcode
update, we are unable to livepatch this set of CVEs. Please plan to reboot
into an updated kernel as soon as possible.

The details of these CVEs follows:

CVE-2018-12207

  On an Ubuntu KVM host configured to use huge pages, a malicious KVM guest
  can cause a host machine check exception (MCE) capable of bringing down
  the host OS.

CVE-2019-0154

  On Intel processors containing an i915 graphics processing unit, it is
  possible from userspace to cause a GPU hang in certain low-power states by
  reading a specific memory-mapped IO register.
 
CVE-2019-0155

  On Intel processors containing an i915 graphics processing unit, it is
  possible to use the GPU's blitter command streamer to write to
  memory-mapped IO locations, which could be used for privilege escalation
  or to leak kernel memory.

CVE-2019-11135

  On Intel processors with support for Transactional Synchronization
  Extensions (TSX), it is possible to exploit a transactional asynchronous
  abort (TAA) to perform a side-channel attack and leak kernel memory.

Further details on the vulnerabilities and our response can be found here:
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/TAA_MCEPSC_i915

Again, due to the high complexity of the fixes and the required microcode
update, we are unable to livepatch this set of CVEs. Please plan to reboot
into an updated kernel as soon as possible.

Software Description:
- linux: Linux kernel

Update instructions:

The problem can be corrected by installing an updated kernel with these
fixes and rebooting.

| Series           | Version               | Flavors                  |
|------------------+-----------------------+--------------------------|
| Ubuntu 18.04 LTS | 4.15.0-1054.55        | aws                      |
| Ubuntu 16.04 LTS | 4.4.0-1098.102        | aws                      |
| Ubuntu 18.04 LTS | 5.0.0-1025.27~18.04.1 | azure                    |
| Ubuntu 16.04 LTS | 4.15.0-1063.66        | azure                    |
| Ubuntu 18.04 LTS | 4.15.0-69.78          | generic lowlatency       |
| Ubuntu 16.04 LTS | 4.15.0-69.78~16.04.1  | generic lowlatency       |
| Ubuntu 14.04 LTS | 4.4.0-168.197~14.04.1 | generic lowlatency       |
| Ubuntu 18.04 LTS | 4.15.0-1063.72        | oem                      |
| Ubuntu 16.04 LTS | 4.4.0-168.197         | generic lowlatency       |

Support Information:

Kernels older than the levels listed above will no longer receive livepatch
updates.

References:
CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135


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