1. Ubuntu Security Notices
  2. USN-2615-1

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

Publication date

20 May 2015

Overview

Several security issues were fixed in the kernel.

Releases

Packages

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)

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
14.04 trusty 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

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References

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