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Ubuntu 14.04 LTS: USN-2700-1 Moderate: Kernel Denial of Service

ubuntu
Calendar Grey July 31, 2015
Scroller Ubuntu
The Ubuntu Security Notice USN-2801-1 provides essential kernel updates to rectify numerous security vulnerabilities.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Andy Lutomirski discovered a flaw in the Linux kernel's handling of nested

NMIs (non-maskable interrupts). An unprivileged local user could exploit

this flaw to cause a denial of service (system crash) or potentially

escalate their privileges. (CVE-2015-3290)

Andy Lutomirski discovered a flaw that allows user to cause the Linux

kernel to ignore some NMIs (non-maskable interrupts). A local unprivileged

user could exploit this flaw to potentially cause the system to miss

important NMIs resulting in unspecified effects. (CVE-2015-3291)

Andy Lutomirski and Petr Matousek discovered that an NMI (non-maskable

interrupt) that interrupts userspace and encounters an IRET fault is

incorrectly handled by the Linux kernel. An unprivileged local user could

exploit this flaw to cause a denial of service (kernel OOPs), corruption,

or potentially escalate privileges on t...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory moderate denial of service update kernel ubuntu system crash

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-61-generic   3.13.0-61.100
  linux-image-3.13.0-61-generic-lpae  3.13.0-61.100
  linux-image-3.13.0-61-lowlatency  3.13.0-61.100
  linux-image-3.13.0-61-powerpc-e500  3.13.0-61.100
  linux-image-3.13.0-61-powerpc-e500mc  3.13.0-61.100
  linux-image-3.13.0-61-powerpc-smp  3.13.0-61.100
  linux-image-3.13.0-61-powerpc64-emb  3.13.0-61.100
  linux-image-3.13.0-61-powerpc64-smp  3.13.0-61.100

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

https://ubuntu.com/security/notices/USN-2700-1

CVE-2015-3290, CVE-2015-3291, CVE-2015-5157

Severity
important
Lowest
Low
Medium
High
Critical

July 31, 2015

Topics%20covered

Topics Covered

security advisory moderate denial of service update kernel ubuntu system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-61.100

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