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Ubuntu Security Notice USN-3146-1

Ubuntu Security Notice USN-3146-1
Posted Nov 30, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3146-1 - It was discovered that the __get_user_asm_ex implementation in the Linux kernel for x86/x86_64 contained extended asm statements that were incompatible with the exception table. A local attacker could use this to gain administrative privileges. Andreas Gruenbacher and Jan Kara discovered that the filesystem implementation in the Linux kernel did not clear the setgid bit during a setxattr call. A local attacker could use this to possibly elevate group privileges. Various other issues were also addressed.

tags | advisory, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644
SHA-256 | 866d7bda3219cca441808b8427f774eec5e84f72709d3a29611f6b9bc47b4ee1

Ubuntu Security Notice USN-3146-1

Change Mirror Download

==========================================================================
Ubuntu Security Notice USN-3146-1
November 30, 2016

linux vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

It was discovered that the __get_user_asm_ex implementation in the Linux
kernel for x86/x86_64 contained extended asm statements that were
incompatible with the exception table. A local attacker could use this to
gain administrative privileges. (CVE-2016-9644)

Andreas Gruenbacher and Jan Kara discovered that the filesystem
implementation in the Linux kernel did not clear the setgid bit during a
setxattr call. A local attacker could use this to possibly elevate group
privileges. (CVE-2016-7097)

Marco Grassi discovered that the driver for Areca RAID Controllers in the
Linux kernel did not properly validate control messages. A local attacker
could use this to cause a denial of service (system crash) or possibly gain
privileges. (CVE-2016-7425)

Daxing Guo discovered a stack-based buffer overflow in the Broadcom
IEEE802.11n FullMAC driver in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or possibly gain
privileges. (CVE-2016-8658)

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.4.0-51-generic 4.4.0-51.72
linux-image-4.4.0-51-generic-lpae 4.4.0-51.72
linux-image-4.4.0-51-lowlatency 4.4.0-51.72
linux-image-4.4.0-51-powerpc-e500mc 4.4.0-51.72
linux-image-4.4.0-51-powerpc-smp 4.4.0-51.72
linux-image-4.4.0-51-powerpc64-emb 4.4.0-51.72
linux-image-4.4.0-51-powerpc64-smp 4.4.0-51.72
linux-image-generic 4.4.0.51.54
linux-image-generic-lpae 4.4.0.51.54
linux-image-lowlatency 4.4.0.51.54
linux-image-powerpc-e500mc 4.4.0.51.54
linux-image-powerpc-smp 4.4.0.51.54
linux-image-powerpc64-emb 4.4.0.51.54
linux-image-powerpc64-smp 4.4.0.51.54

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-3146-1
CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-51.72


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