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Alerts This Week
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Ubuntu 11.10 USN-1431-1 Critical Threats: Kernel Security Issues

ubuntu
Calendar Grey May 1, 2012
Scroller Ubuntu
On May 1, 2012, Ubuntu released updates to fix kernel vulnerabilities affecting performance and security. Admins should promptly apply these patches to safeguard systems
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 found in the Linux's kernels ext4 file system when mounted with

a journal. A local, unprivileged user could exploit this flaw to cause a

denial of service. (CVE-2011-4086)

Sasha Levin discovered a flaw in the permission checking for device

assignments requested via the kvm ioctl in the Linux kernel. A local user

could use this flaw to crash the system causing a denial of service.

(CVE-2011-4347)

Stephan Bärwolf discovered a flaw in the KVM (kernel-based virtual

machine) subsystem of the Linux kernel. A local unprivileged user can crash

use this flaw to crash VMs causing a deny of service. (CVE-2012-0045)

A flaw was discovered in the Linux kernel's cifs file system. An

unprivileged local user could exploit this flaw to crash the system leading

to a denial of service. (CVE-2012-1090)

H. Peter Anvin reported a flaw in the Linux kernel tha...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel system update software vulnerabilities

Update Instructions

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

Ubuntu 11.10:
  linux-image-3.0.0-19-generic    3.0.0-19.33
  linux-image-3.0.0-19-generic-pae  3.0.0-19.33
  linux-image-3.0.0-19-omap       3.0.0-19.33
  linux-image-3.0.0-19-powerpc    3.0.0-19.33
  linux-image-3.0.0-19-powerpc-smp  3.0.0-19.33
  linux-image-3.0.0-19-powerpc64-smp  3.0.0-19.33
  linux-image-3.0.0-19-server     3.0.0-19.33
  linux-image-3.0.0-19-virtual    3.0.0-19.33

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-1431-1

CVE-2011-4086, CVE-2011-4347, CVE-2012-0045, CVE-2012-1090,

CVE-2012-1097, CVE-2012-1146, CVE-2012-1179

Severity
critical
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Critical

May 01, 2012

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel system update software vulnerabilities

Package Information

https://launchpad.net/ubuntu/+source/linux/3.0.0-19.33

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