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Ubuntu 14.04 LTS: USN-3742-1 Moderate: Kernel Memory Issues

ubuntu
Calendar Grey August 14, 2018
Dist Ubuntu Esm H88
Numerous vulnerabilities addressed in the Ubuntu kernel, covering concerns related to potential service interruptions and risks of memory leaks.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

Details:

It was discovered that memory present in the L1 data cache of an Intel CPU

core may be exposed to a malicious process that is executing on the CPU

core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local

attacker in a guest virtual machine could use this to expose sensitive

information (memory from other guests or the host OS). (CVE-2018-3646)

It was discovered that memory present in the L1 data cache of an Intel CPU

core may be exposed to a malicious process that is executing on the CPU

core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local

attacker could use this to expose sensitive information (memory from the

kernel or other processes). (CVE-2018-3620)

Andrey Konovalov discovered an out-of-bounds read in the POSIX

timers subsystem in the Linux kernel. A local attacker could use

this to cause a denial of service (system crash) ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory moderate denial of service kernel ubuntu memory exposure l1tf

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-155-generic  3.13.0-155.205
  linux-image-3.13.0-155-generic-lpae  3.13.0-155.205
  linux-image-3.13.0-155-lowlatency  3.13.0-155.205
  linux-image-3.13.0-155-powerpc-e500  3.13.0-155.205
  linux-image-3.13.0-155-powerpc-e500mc  3.13.0-155.205
  linux-image-3.13.0-155-powerpc-smp  3.13.0-155.205
  linux-image-3.13.0-155-powerpc64-emb  3.13.0-155.205
  linux-image-3.13.0-155-powerpc64-smp  3.13.0-155.205
  linux-image-generic             3.13.0.155.165
  linux-image-generic-lpae        3.13.0.155.165
  linux-image-lowlatency          3.13.0.155.165
  linux-image-powerpc-e500        3.13.0.155.165
  linux-image-powerpc-e500mc      3.13.0.155.165
  linux-image-powerpc-smp         3.13.0.155.165
  linux-image-powerpc64-emb       3.13.0.155.165
  linux-image-powerpc64-smp       3.13.0.155.165

Please note that the recommended mitigation for CVE-2018-3646 involves
updating processor microcode in addition to updating the kernel;
however, the kernel includes a fallback for processors that have not
received microcode updates.

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-3742-1

CVE-2017-18344, CVE-2018-3620, CVE-2018-3646, CVE-2018-5390,

CVE-2018-5391,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF

August 14, 2018

Topics%20covered

Topics Covered

security advisory moderate denial of service kernel ubuntu memory exposure l1tf

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-155.205

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