USN-2888-1: Linux kernel (Utopic HWE) vulnerabilities

Ubuntu Security Notice USN-2888-1

1st February, 2016

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

It was discovered that a use-after-free vulnerability existed in the
AF_UNIX implementation in the Linux kernel. A local attacker could use
crafted epoll_ctl calls to cause a denial of service (system crash) or
expose sensitive information. (CVE-2013-7446)

It was discovered that the KVM implementation in the Linux kernel did not
properly restore the values of the Programmable Interrupt Timer (PIT). A
user-assisted attacker in a KVM guest could cause a denial of service in
the host (system crash). (CVE-2015-7513)

It was discovered that the Linux kernel keyring subsystem contained a race
between read and revoke operations. A local attacker could use this to
cause a denial of service (system crash). (CVE-2015-7550)

Sasha Levin discovered that the Reliable Datagram Sockets (RDS)
implementation in the Linux kernel had a race condition when checking
whether a socket was bound or not. A local attacker could use this to cause
a denial of service (system crash). (CVE-2015-7990)

It was discovered that the Btrfs implementation in the Linux kernel
incorrectly handled compressed inline extants on truncation. A local
attacker could use this to expose sensitive information. (CVE-2015-8374)

郭永刚 discovered that the Linux kernel networking implementation did
not validate protocol identifiers for certain protocol families, A local
attacker could use this to cause a denial of service (system crash) or
possibly gain administrative privileges. (CVE-2015-8543)

Dmitry Vyukov discovered that the pptp implementation in the Linux kernel
did not verify an address length when setting up a socket. A local attacker
could use this to craft an application that exposed sensitive information
from kernel memory. (CVE-2015-8569)

David Miller discovered that the Bluetooth implementation in the Linux
kernel did not properly validate the socket address length for Synchronous
Connection-Oriented (SCO) sockets. A local attacker could use this to
expose sensitive information. (CVE-2015-8575)

Update instructions

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

Ubuntu 14.04 LTS:

linux-image-3.16.0-60-powerpc64-smp

3.16.0-60.80~14.04.1

linux-image-3.16.0-60-lowlatency

3.16.0-60.80~14.04.1

linux-image-3.16.0-60-generic

3.16.0-60.80~14.04.1

linux-image-3.16.0-60-generic-lpae

3.16.0-60.80~14.04.1

linux-image-3.16.0-60-powerpc-e500mc

3.16.0-60.80~14.04.1

linux-image-3.16.0-60-powerpc64-emb

3.16.0-60.80~14.04.1

linux-image-3.16.0-60-powerpc-smp

3.16.0-60.80~14.04.1

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

CVE-2013-7446,

CVE-2015-7513,

CVE-2015-7550,

CVE-2015-7990,

CVE-2015-8374,

CVE-2015-8543,

CVE-2015-8569,

CVE-2015-8575