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Ubuntu 14.10: 2421-1 Critical Advisory on Kernel Denial of Service

ubuntu
Calendar Grey November 25, 2014
Dist Ubuntu Esm H88
Essential kernel concerns affecting Ubuntu security and performance are highlighted in this advisory on critical updates.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

A flaw was discovered in how the Linux kernel's KVM (Kernel Virtual

Machine) subsystem handles the CR4 control register at VM entry on Intel

processors. A local host OS user can exploit this to cause a denial of

service (kill arbitrary processes, or system disruption) by leveraging

/dev/kvm access. (CVE-2014-3690)

Don Bailey discovered a flaw in the LZO decompress algorithm used by the

Linux kernel. An attacker could exploit this flaw to cause a denial of

service (memory corruption or OOPS). (CVE-2014-4608)

Andy Lutomirski discovered that the Linux kernel was not checking the

CAP_SYS_ADMIN when remounting filesystems to read-only. A local user could

exploit this flaw to cause a denial of service (loss of writability).

(CVE-2014-7975)

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu

Update Instructions

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

Ubuntu 14.10:
  linux-image-3.16.0-25-generic   3.16.0-25.33
  linux-image-3.16.0-25-generic-lpae  3.16.0-25.33
  linux-image-3.16.0-25-lowlatency  3.16.0-25.33
  linux-image-3.16.0-25-powerpc-e500mc  3.16.0-25.33
  linux-image-3.16.0-25-powerpc-smp  3.16.0-25.33
  linux-image-3.16.0-25-powerpc64-emb  3.16.0-25.33
  linux-image-3.16.0-25-powerpc64-smp  3.16.0-25.33

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-2421-1

CVE-2014-3690, CVE-2014-4608, CVE-2014-7975

Severity
critical
Lowest
Low
Medium
High
Critical

November 25, 2014

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/3.16.0-25.33

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