USN-3291-1: Linux kernel vulnerabilities

17 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 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

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