USN-2748-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2748-1

28th September, 2015

linux vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux
    – Linux kernel

Details

Benjamin Randazzo discovered an information leak in the md (multiple
device) driver when the bitmap_info.file is disabled. A local privileged
attacker could use this to obtain sensitive information from the kernel.
(CVE-2015-5697)

Marc-André Lureau discovered that the vhost driver did not properly
release the userspace provided log file descriptor. A privileged attacker
could use this to cause a denial of service (resource exhaustion).
(CVE-2015-6252)

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-65-powerpc-e500

3.13.0-65.105
linux-image-3.13.0-65-powerpc64-smp

3.13.0-65.105
linux-image-3.13.0-65-powerpc-smp

3.13.0-65.105
linux-image-3.13.0-65-powerpc64-emb

3.13.0-65.105
linux-image-3.13.0-65-generic

3.13.0-65.105
linux-image-3.13.0-65-generic-lpae

3.13.0-65.105
linux-image-3.13.0-65-powerpc-e500mc

3.13.0-65.105
linux-image-3.13.0-65-lowlatency

3.13.0-65.105

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2015-5697,

CVE-2015-6252

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