[USN-2948-2] Linux kernel (Utopic HWE) regression

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-2948-2
April 11, 2016

linux-lts-utopic regression
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

USN 2948-1 introduced a regression in the Ubuntu 14.10 Linux kernel
backported to Ubuntu 14.04 LTS.

Software Description:
- linux-lts-utopic: Linux hardware enablement kernel from Utopic for Trusty

Details:

USN-2948-1 fixed vulnerabilities in the Ubuntu 14.10 Linux kernel
backported to Ubuntu 14.04 LTS. An incorrect reference counting
fix in the radeon driver introduced a regression that could cause a
system crash. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Ralf Spenneberg discovered that the USB driver for Clie devices in the
 Linux kernel did not properly sanity check the endpoints reported by the
 device. An attacker with physical access could cause a denial of service
 (system crash). (CVE-2015-7566)
 
 Ralf Spenneberg discovered that the usbvision driver in the Linux kernel
 did not properly sanity check the interfaces and endpoints reported by the
 device. An attacker with physical access could cause a denial of service
 (system crash). (CVE-2015-7833)
 
 Venkatesh Pottem discovered a use-after-free vulnerability in the Linux
 kernel's CXGB3 driver. A local attacker could use this to cause a denial of
 service (system crash) or possibly execute arbitrary code. (CVE-2015-8812)
 
 It was discovered that a race condition existed in the ioctl handler for
 the TTY driver in the Linux kernel. A local attacker could use this to
 cause a denial of service (system crash) or expose sensitive information.
 (CVE-2016-0723)
 
 Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux
 Extended Verification Module (EVM). An attacker could use this to affect
 system integrity. (CVE-2016-2085)
 
 David Herrmann discovered that the Linux kernel incorrectly accounted file
 descriptors to the original opener for in-flight file descriptors sent over
 a unix domain socket. A local attacker could use this to cause a denial of
 service (resource exhaustion). (CVE-2016-2550)
 
 Ralf Spenneberg discovered that the USB driver for Treo devices in the
 Linux kernel did not properly sanity check the endpoints reported by the
 device. An attacker with physical access could cause a denial of service
 (system crash). (CVE-2016-2782)
 
 It was discovered that the Linux kernel did not enforce limits on the
 amount of data allocated to buffer pipes. A local attacker could use this
 to cause a denial of service (resource exhaustion). (CVE-2016-2847)

Update instructions:

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

Ubuntu 14.04 LTS:
  linux-image-3.16.0-70-generic   3.16.0-70.90~14.04.1
  linux-image-3.16.0-70-generic-lpae  3.16.0-70.90~14.04.1
  linux-image-3.16.0-70-lowlatency  3.16.0-70.90~14.04.1
  linux-image-3.16.0-70-powerpc-e500mc  3.16.0-70.90~14.04.1
  linux-image-3.16.0-70-powerpc-smp  3.16.0-70.90~14.04.1
  linux-image-3.16.0-70-powerpc64-emb  3.16.0-70.90~14.04.1
  linux-image-3.16.0-70-powerpc64-smp  3.16.0-70.90~14.04.1

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:
  http://www.ubuntu.com/usn/usn-2948-2
  http://www.ubuntu.com/usn/usn-2948-1
  https://bugs.launchpad.net/bugs/1566726

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1

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