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Ubuntu Security Notice USN-2908-5

Ubuntu Security Notice USN-2908-5
Posted Feb 27, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2908-5 - USN-2908-2 fixed vulnerabilities in the Ubuntu 15.10 Linux kernel backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a regression that broke graphics displays for Ubuntu 14.04 LTS guests running the Ubuntu 15.10 backport kernel within VMWare virtual machines. This update fixes the problem. Various other issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2013-4312, CVE-2015-8785, CVE-2016-1575, CVE-2016-1576, CVE-2016-2069
SHA-256 | 5e10ec647672807200c174c55a66cdcc9b1b8e1775c7a5dfb35815b6935f9d01

Ubuntu Security Notice USN-2908-5

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Content-Disposition: inline

==========================================================================Ubuntu Security Notice USN-2908-5
February 27, 2016

linux-lts-wily regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

USN-2908-2 introduced a regression in the Ubuntu 15.10 Linux kernel
backported to Ubuntu 14.04 LTS.

Software Description:
- linux-lts-wily: Linux hardware enablement kernel from Wily for Trusty

Details:

USN-2908-2 fixed vulnerabilities in the Ubuntu 15.10 Linux kernel
backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a
regression that broke graphics displays for Ubuntu 14.04 LTS guests
running the Ubuntu 15.10 backport kernel within VMWare virtual
machines. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,
incorrectly propagated file attributes, including setuid. A local
unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly
propagated security sensitive extended attributes, such as POSIX ACLs. A
local unprivileged attacker could use this to gain privileges.
(CVE-2016-1575)

It was discovered that the Linux kernel did not properly enforce rlimits
for file descriptors sent over UNIX domain sockets. A local attacker could
use this to cause a denial of service. (CVE-2013-4312)

It was discovered that the Linux kernel's Filesystem in Userspace (FUSE)
implementation did not handle initial zero length segments properly. A
local attacker could use this to cause a denial of service (unkillable
task). (CVE-2015-8785)

Andy Lutomirski discovered a race condition in the Linux kernel's
translation lookaside buffer (TLB) handling of flush events. A local
attacker could use this to cause a denial of service or possibly leak
sensitive information. (CVE-2016-2069)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-4.2.0-30-generic 4.2.0-30.36~14.04.1
linux-image-4.2.0-30-generic-lpae 4.2.0-30.36~14.04.1
linux-image-4.2.0-30-lowlatency 4.2.0-30.36~14.04.1
linux-image-4.2.0-30-powerpc-e500mc 4.2.0-30.36~14.04.1
linux-image-4.2.0-30-powerpc-smp 4.2.0-30.36~14.04.1
linux-image-4.2.0-30-powerpc64-emb 4.2.0-30.36~14.04.1
linux-image-4.2.0-30-powerpc64-smp 4.2.0-30.36~14.04.1

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

References:
http://www.ubuntu.com/usn/usn-2908-5
http://www.ubuntu.com/usn/usn-2908-1
https://launchpad.net/bugs/1548587

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-wily/4.2.0-30.36~14.04.1
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