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Ubuntu 12.04 LTS USN-1947-1 Critical: Linux Kernel Denial of Service

ubuntu
Calendar Grey September 7, 2013
Scroller Ubuntu
Tackling vulnerabilities in the Ubuntu Linux kernel, focusing on denial of service threats and the importance of applying patch updates regularly.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-quantal: Linux hardware enablement kernel from Quantal

Details:

A denial of service flaw was discovered in the Btrfs file system in the

Linux kernel. A local user could cause a denial of service by creating a

large number of files with names that have the same CRC32 hash value.

(CVE-2012-5374)

A denial of service flaw was discovered in the Btrfs file system in the

Linux kernel. A local user could cause a denial of service (prevent file

creation) for a victim, by creating a file with a specific CRC32C hash

value in a directory important to the victim. (CVE-2012-5375)

Vasily Kulikov discovered a flaw in the Linux Kernel's perf tool that

allows specified to be run as root. A local could exploit this flaw to run

commands as root when using the perf tool. user could exploit this

(CVE-2013-1060)

A flaw was discovered in the Xen subsystem of the Linux kernel when it

provides r...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel patch ubuntu linux-lts-quantal

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.5.0-40-generic    3.5.0-40.62~precise1

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-1947-1

CVE-2012-5374, CVE-2012-5375, CVE-2013-1060, CVE-2013-2140,

CVE-2013-2232, CVE-2013-2234, CVE-2013-4162, CVE-2013-4163

Severity
critical
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Critical

September 07, 2013

Topics%20covered

Topics Covered

security advisory denial of service kernel patch ubuntu linux-lts-quantal

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-quantal/3.5.0-40.62~precise1

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