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Kernel Live Patch Security Notice LSN-0056-1

Kernel Live Patch Security Notice LSN-0056-1
Posted Sep 23, 2019
Authored by Benjamin M. Romer

Peter Pi discovered a buffer overflow in the virtio network backend (vhost_net) implementation in the Linux kernel. An attacker in a guest may be able to use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS.

tags | advisory, denial of service, overflow, arbitrary, kernel
systems | linux
advisories | CVE-2019-14835
MD5 | 4445ce7fa5ca560dafec0ff9b45ccb45

Kernel Live Patch Security Notice LSN-0056-1

Change Mirror Download
==========================================================================
Kernel Live Patch Security Notice 0056-1
September 20, 2019

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

A security issue affects these releases of Ubuntu:

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

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Peter Pi discovered a buffer overflow in the virtio network backend
(vhost_net) implementation in the Linux kernel. An attacker in a guest may
be able to use this to cause a denial of service (host OS crash) or
possibly execute arbitrary code in the host OS. (CVE-2019-14835)

Update instructions:

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

| Kernel | Version | flavors |
|--------------------------+----------+--------------------------|
| 4.4.0-148.174 | 56.1 | lowlatency, generic |
| 4.4.0-150.176 | 56.1 | generic, lowlatency |
| 4.4.0-151.178 | 56.1 | lowlatency, generic |
| 4.4.0-154.181 | 56.1 | lowlatency, generic |
| 4.4.0-157.185 | 56.1 | lowlatency, generic |
| 4.4.0-159.187 | 56.1 | lowlatency, generic |
| 4.4.0-161.189 | 56.1 | lowlatency, generic |
| 4.15.0-50.54 | 56.1 | generic, lowlatency |
| 4.15.0-50.54~16.04.1 | 56.1 | generic, lowlatency |
| 4.15.0-51.55 | 56.1 | generic, lowlatency |
| 4.15.0-51.55~16.04.1 | 56.1 | generic, lowlatency |
| 4.15.0-52.56 | 56.1 | lowlatency, generic |
| 4.15.0-52.56~16.04.1 | 56.1 | generic, lowlatency |
| 4.15.0-54.58 | 56.1 | generic, lowlatency |
| 4.15.0-54.58~16.04.1 | 56.1 | generic, lowlatency |
| 4.15.0-55.60 | 56.1 | generic, lowlatency |
| 4.15.0-58.64 | 56.1 | generic, lowlatency |
| 4.15.0-58.64~16.04.1 | 56.1 | lowlatency, generic |
| 4.15.0-60.67 | 56.1 | lowlatency, generic |
| 4.15.0-60.67~16.04.1 | 56.1 | generic, lowlatency |
| 4.15.0-62.69 | 56.1 | generic, lowlatency |
| 4.15.0-62.69~16.04.1 | 56.1 | lowlatency, generic |

Support Information:

Kernels older than the levels listed below do not receive livepatch
updates. Please upgrade your kernel as soon as possible.

| Series | Version | Flavors |
|------------------+------------------+--------------------------|
| Ubuntu 18.04 LTS | 4.15.0-50 | generic lowlatency |
| Ubuntu 16.04 LTS | 4.15.0-50 | generic lowlatency |
| Ubuntu 14.04 LTS | 4.4.0-148 | generic lowlatency |
| Ubuntu 16.04 LTS | 4.4.0-148 | generic lowlatency |

References:
CVE-2019-14835


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