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Ubuntu 12.04 LTS USN-3167-2 Critical: KVM Memory Exposure and DoS

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
The Ubuntu Security Announcement USN-3168-3 resolves vulnerabilities found in the linux-generic kernel, which has been patched for Ubuntu 14.04 LTS.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-ti-omap4: Linux kernel for OMAP4

Details:

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)

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

free in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux

kernel. A local attacker could use this to cause a denial of service

(system crash). (CVE-2016-9794)

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux-ti-omap4 kernel exposure

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-1498-omap4    3.2.0-1498.125
  linux-image-omap4               3.2.0.1498.93

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-3167-2

https://ubuntu.com/security/notices/USN-3167-1

CVE-2016-9756, CVE-2016-9794

Severity
critical
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Critical

January 11, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux-ti-omap4 kernel exposure

Package Information

https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1498.125

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