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Ubuntu 12.04 LTS USN-3168-2 Critical: Kernel Memory Exposure Issues

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
Recent updates in Ubuntu address several vulnerabilities, including potential data leaks and risks associated with service interruptions in the kernel.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise

Details:

USN-3168-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu

12.04 LTS.

Dmitry Vyukov discovered that the KVM implementation in the Linux kernel

did not properly initialize the Code Segment (CS) in certain error cases. A

local attacker could use this to expose sensitive information (kernel

memory). (CVE-2016-9756)

Andrey Konovalov discovered that signed integer overflows existed in the

setsockopt() system call when handling the SO_SNDBUFFORCE and

SO_RCVBUFFORCE options. A local attacker with the CAP_NET_ADMIN capability

could use this to cause a denial of service (system crash or memory

corruption). (CVE-2016-9793)

Baozeng Ding discovered a race condition that could lead to a use-af...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory kernel Denial of Service ubuntu system crash memory exposure

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.13.0-107-generic  3.13.0-107.154~precise1
  linux-image-3.13.0-107-generic-lpae  3.13.0-107.154~precise1
  linux-image-generic-lpae-lts-trusty  3.13.0.107.98
  linux-image-generic-lts-trusty  3.13.0.107.98

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

https://ubuntu.com/security/notices/USN-3168-2

https://ubuntu.com/security/notices/USN-3168-1

CVE-2016-9756, CVE-2016-9793, CVE-2016-9794, CVE-2016-9806

Severity
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January 11, 2017

Topics%20covered

Topics Covered

security advisory kernel Denial of Service ubuntu system crash memory exposure

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-107.154~precise1

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