USN-2748-1: Linux kernel vulnerabilities

28 September 2015

linux vulnerabilities

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

  • Ubuntu 14.04 LTS


Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel


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 versions:

Ubuntu 14.04 LTS
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-lowlatency - 3.13.0-65.105
linux-image-3.13.0-65-powerpc-e500 - 3.13.0-65.105
linux-image-3.13.0-65-powerpc-e500mc - 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-powerpc64-smp - 3.13.0-65.105

To update your system, please follow these instructions:

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.