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Ubuntu 11.10 USN-1720-1 Critical: Kernel Denial Of Service Issues

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Calendar Grey February 12, 2013
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Ubuntu Security Notice USN-1730-1 highlights vulnerabilities found in the Linux kernel and provides crucial updates to address these issues. It is essential to act promptly.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

It was discovered that hypervkvpd, which is distributed in the Linux

kernel, was not correctly validating the origin on Netlink messages. An

untrusted local user can cause a denial of service of Linux guests in

Hyper-V virtualization environments. (CVE-2012-2669)

Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem

that can expose stale data. An unprivileged user could exploit this flaw to

cause an information leak. (CVE-2012-4508)

Florian Weimer discovered that hypervkvpd, which is distributed in the

Linux kernel, was not correctly validating source addresses of netlink

packets. An untrusted local user can cause a denial of service by causing

hypervkvpd to exit. (CVE-2012-5532)

Andrew Cooper of Citrix reported a Xen stack corruption in the Linux

kernel. An unprivileged user in a 32bit PVOPS guest can cause the guest

kernel to cras...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service information leak kernel update instructions ubuntu stack corruption

Update Instructions

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

Ubuntu 11.10:
  linux-image-3.0.0-31-generic    3.0.0-31.48
  linux-image-3.0.0-31-generic-pae  3.0.0-31.48
  linux-image-3.0.0-31-omap       3.0.0-31.48
  linux-image-3.0.0-31-powerpc    3.0.0-31.48
  linux-image-3.0.0-31-powerpc-smp  3.0.0-31.48
  linux-image-3.0.0-31-powerpc64-smp  3.0.0-31.48
  linux-image-3.0.0-31-server     3.0.0-31.48
  linux-image-3.0.0-31-virtual    3.0.0-31.48

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-1720-1

CVE-2012-2669, CVE-2012-4508, CVE-2012-5532, CVE-2013-0190

Severity
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Critical

February 12, 2013

Topics%20covered

Topics Covered

security advisory denial of service information leak kernel update instructions ubuntu stack corruption

Package Information

https://launchpad.net/ubuntu/+source/linux/3.0.0-31.48

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