USN-2544-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2544-1

24th March, 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

Eric Windisch discovered flaw in how the Linux kernel's XFS file system

replaces remote attributes. A local access with access to an XFS file

system could exploit this flaw to escalate their privileges.

(CVE-2015-0274)

A flaw was discovered in the automatic loading of modules in the crypto

subsystem of the Linux kernel. A local user could exploit this flaw to load

installed kernel modules, increasing the attack surface and potentially

using this to gain administrative privileges. (CVE-2013-7421)

The Linux kernel's splice system call did not correctly validate its

parameters. A local, unprivileged user could exploit this flaw to cause a

denial of service (system crash). (CVE-2014-7822)

A flaw was discovered in the crypto subsystem when screening module names

for automatic module loading if the name contained a valid crypto module

name, eg. vfat(aes). A local user could exploit this flaw to load installed

kernel modules, increasing the attack surface and potentially using this to

gain administrative privileges. (CVE-2014-9644)

Update instructions

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

Ubuntu 14.04 LTS:

linux-image-3.13.0-48-powerpc-smp 3.13.0-48.80

linux-image-3.13.0-48-powerpc-e500mc 3.13.0-48.80

linux-image-3.13.0-48-generic-lpae 3.13.0-48.80

linux-image-3.13.0-48-powerpc-e500 3.13.0-48.80

linux-image-3.13.0-48-generic 3.13.0-48.80

linux-image-3.13.0-48-powerpc64-smp 3.13.0-48.80

linux-image-3.13.0-48-lowlatency 3.13.0-48.80

linux-image-3.13.0-48-powerpc64-emb 3.13.0-48.80

To update your system, please follow these instructions: http://ift.tt/17VXqjU.

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-2013-7421, CVE-2014-7822, CVE-2014-9644, CVE-2015-0274

from Ubuntu Security Notices http://ift.tt/1NaaLWm