USN-2615-1: Linux kernel (Utopic HWE) vulnerabilities

20 May 2015

linux-lts-utopic 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-lts-utopic - Linux hardware enablement kernel from Utopic

Details

Alexandre Oliva reported a race condition flaw in the btrfs file system’s handling of extended attributes (xattrs). A local attacker could exploit this flaw to bypass ACLs and potentially escalate privileges. (CVE-2014-9710)

A memory corruption issue was discovered in AES decryption when using the Intel AES-NI accelerated code path. A remote attacker could exploit this flaw to cause a denial of service (system crash) or potentially escalate privileges on Intel base machines with AEC-GCM mode IPSec security association. (CVE-2015-3331)

A flaw was discovered in the Linux kernel’s IPv4 networking when using TCP fast open to initiate a connection. An unprivileged local user could exploit this flaw to cause a denial of service (system crash). (CVE-2015-3332)

Update instructions

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

Ubuntu 14.04 LTS
linux-image-3.16.0-38-generic - 3.16.0-38.52~14.04.1
linux-image-3.16.0-38-generic-lpae - 3.16.0-38.52~14.04.1
linux-image-3.16.0-38-lowlatency - 3.16.0-38.52~14.04.1
linux-image-3.16.0-38-powerpc-e500mc - 3.16.0-38.52~14.04.1
linux-image-3.16.0-38-powerpc-smp - 3.16.0-38.52~14.04.1
linux-image-3.16.0-38-powerpc64-emb - 3.16.0-38.52~14.04.1
linux-image-3.16.0-38-powerpc64-smp - 3.16.0-38.52~14.04.1

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