7.2 - USN-3291-1

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 versions:

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

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-3291-1
CVE-2017-7187, CVE-2017-7261, CVE-2017-7294, CVE-2017-7616

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-78.99