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Ubuntu 12.04 ESM Security Advisory USN-3641-2: Multiple Kernel Issues

ubuntu
Calendar Grey May 8, 2018
Scroller Ubuntu
Debian-based distributions must apply the latest patches to address Linux kernel vulnerabilities. Ubuntu users should follow guidelines to install updates and reduce risks.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

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

Details:

USN-3641-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04

LTS, Ubuntu 16.04 LTS, and Ubuntu 17.10. This update provides the

corresponding updates for Ubuntu 12.04 ESM.

Nick Peterson discovered that the Linux kernel did not properly handle

debug exceptions following a MOV/POP to SS instruction. A local attacker

could use this to cause a denial of service (system crash). This issue only

affected the amd64 architecture. (CVE-2018-8897)

Andy Lutomirski discovered that the KVM subsystem of the Linux kernel did

not properly emulate the ICEBP instruction following a MOV/POP to SS

instruction. A local attacker in a KVM virtual machine could use this to

cause a denial of service (guest VM crash) or possibly escalate privileges

inside of the virtual machine. This issue only affected the ...

Read the Full Advisory

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Topics Covered

security advisory denial of service ubuntu system crash linux kernel

Update Instructions

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

Ubuntu 12.04 ESM:
  linux-image-3.13.0-147-generic  3.13.0-147.196~precise1
  linux-image-3.13.0-147-generic-lpae  3.13.0-147.196~precise1
  linux-image-3.2.0-134-generic   3.2.0-134.180
  linux-image-3.2.0-134-generic-pae  3.2.0-134.180
  linux-image-3.2.0-134-highbank  3.2.0-134.180
  linux-image-3.2.0-134-omap      3.2.0-134.180
  linux-image-3.2.0-134-powerpc-smp  3.2.0-134.180
  linux-image-3.2.0-134-powerpc64-smp  3.2.0-134.180
  linux-image-3.2.0-134-virtual   3.2.0-134.180
  linux-image-generic             3.2.0.134.149
  linux-image-generic-lpae-lts-trusty  3.13.0.147.138
  linux-image-generic-lts-trusty  3.13.0.147.138
  linux-image-generic-pae         3.2.0.134.149
  linux-image-highbank            3.2.0.134.149
  linux-image-omap                3.2.0.134.149
  linux-image-powerpc             3.2.0.134.149
  linux-image-powerpc-smp         3.2.0.134.149
  linux-image-powerpc64-smp       3.2.0.134.149

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-3641-2

https://ubuntu.com/security/notices/USN-3641-1

CVE-2018-1000199, CVE-2018-1087, CVE-2018-8897

Severity
important
Lowest
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Medium
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Critical

May 08, 2018

Topics%20covered

Topics Covered

security advisory denial of service ubuntu system crash linux kernel

Package Information

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