USN-3291-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3291-1

16th May, 2017

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

Dmitry Vyukov discovered that the generic SCSI (sg) subsystem in the Linux
kernel contained a stack-based buffer overflow. A local attacker with
access to an sg device could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2017-7187)

It was discovered that a NULL pointer dereference existed in the Direct
Rendering Manager (DRM) driver for VMWare devices in the Linux kernel. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2017-7261)

Li Qiang discovered that an integer overflow vulnerability existed in the
Direct Rendering Manager (DRM) driver for VMWare devices in the Linux
kernel. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2017-7294)

It was discovered that an information leak existed in the set_mempolicy and
mbind compat syscalls in the Linux kernel. A local attacker could use this
to expose sensitive information (kernel memory). (CVE-2017-7616)

Update instructions

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

Ubuntu 16.04 LTS:
linux-image-powerpc-smp 4.4.0.78.84
linux-image-powerpc-e500mc 4.4.0.78.84
linux-image-4.4.0-78-powerpc64-emb 4.4.0-78.99
linux-image-generic 4.4.0.78.84
linux-image-4.4.0-78-powerpc-smp 4.4.0-78.99
linux-image-4.4.0-78-generic 4.4.0-78.99
linux-image-4.4.0-78-lowlatency 4.4.0-78.99
linux-image-powerpc64-emb 4.4.0.78.84
linux-image-4.4.0-78-generic-lpae 4.4.0-78.99
linux-image-powerpc64-smp 4.4.0.78.84
linux-image-generic-lpae 4.4.0.78.84
linux-image-4.4.0-78-powerpc-e500mc 4.4.0-78.99
linux-image-lowlatency 4.4.0.78.84
linux-image-4.4.0-78-powerpc64-smp 4.4.0-78.99

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-2017-7187, CVE-2017-7261, CVE-2017-7294, CVE-2017-7616