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Ubuntu 12.04 LTS USN-2946-2 Critical: Kernel Denial Of Service Issues

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Calendar Grey April 6, 2016
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Ubuntu 18.04 LTS patches tackle various system vulnerabilities to improve stability. Discover the specifics and upgrade guidelines.
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:

Venkatesh Pottem discovered a use-after-free vulnerability in the Linux

kernel's CXGB3 driver. A local attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2015-8812)

Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux

Extended Verification Module (EVM). An attacker could use this to affect

system integrity. (CVE-2016-2085)

David Herrmann discovered that the Linux kernel incorrectly accounted file

descriptors to the original opener for in-flight file descriptors sent over

a unix domain socket. A local attacker could use this to cause a denial of

service (resource exhaustion). (CVE-2016-2550)

It was discovered that the Linux kernel did not enforce limits on the

amount of data allocated to buffer pipes. A local attacker could use this

to cause ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel issue ubuntu resource exhaustion

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.13.0-85-generic   3.13.0-85.129~precise1
  linux-image-3.13.0-85-generic-lpae  3.13.0-85.129~precise1

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-2946-2

https://ubuntu.com/security/notices/USN-2946-1

CVE-2015-8812, CVE-2016-2085, CVE-2016-2550, CVE-2016-2847

Severity
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April 06, 2016

Topics%20covered

Topics Covered

security advisory denial of service critical kernel issue ubuntu resource exhaustion

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-85.129~precise1

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