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Ubuntu 11.04: USN-1457-1 Critical: Kernel Denial Of Service Flaws

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Calendar Grey May 31, 2012
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Multiple vulnerabilities resolved in Ubuntu 11.04's Linux kernel, tackling service interruption and security concerns via patches.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Andy Adamson discovered a flaw in the Linux kernel's NFSv4 implementation.

A remote NFS server (attacker) could exploit this flaw to cause a denial of

service. (CVE-2011-4131)

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual

cpu setup. An unprivileged local user could exploit this flaw to crash the

system leading to a denial of service. (CVE-2012-1601)

A flaw was discovered in the Linux kernel's KVM (kernel virtual machine).

An administrative user in the guest OS could leverage this flaw to cause a

denial of service in the host OS. (CVE-2012-2121)

Steve Grubb reported a flaw with Linux fscaps (file system base

capabilities) when used to increase the permissions of a process. For

application on which fscaps are in use a local attacker can disable address

space randomization to make attacking the process with raised privileges

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu kernel system update

Update Instructions

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

Ubuntu 11.04:
  linux-image-2.6.38-15-generic   2.6.38-15.60
  linux-image-2.6.38-15-generic-pae  2.6.38-15.60
  linux-image-2.6.38-15-omap      2.6.38-15.60
  linux-image-2.6.38-15-powerpc   2.6.38-15.60
  linux-image-2.6.38-15-powerpc-smp  2.6.38-15.60
  linux-image-2.6.38-15-powerpc64-smp  2.6.38-15.60
  linux-image-2.6.38-15-server    2.6.38-15.60
  linux-image-2.6.38-15-versatile  2.6.38-15.60
  linux-image-2.6.38-15-virtual   2.6.38-15.60

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-1457-1

CVE-2011-4131, CVE-2012-1601, CVE-2012-2121, CVE-2012-2123,

CVE-2012-2133

Severity
critical
Lowest
Low
Medium
High
Critical

May 31, 2012

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu kernel system update

Package Information

https://launchpad.net/ubuntu/+source/linux/2.6.38-15.60

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