1. Ubuntu Security Notices
  2. USN-3405-1

USN-3405-1: Linux kernel vulnerabilities

Publication date

28 August 2017

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-gke - Linux kernel for Google Container Engine (GKE) systems
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

Details

It was discovered that a use-after-free vulnerability existed in the POSIX
message queue implementation in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-11176)

Huang Weller discovered that the ext4 filesystem implementation in the
Linux kernel mishandled a needs-flushing-before-commit list. A local
attacker could use this to expose sensitive information. (CVE-2017-7495)

It was discovered that a buffer overflow existed in the Broadcom FullMAC
WLAN driver in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2017-7541)

It was discovered that the Linux kernel did not honor the UEFI secure boot
mode when performing a kexec operation. A...

It was discovered that a use-after-free vulnerability existed in the POSIX
message queue implementation in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-11176)

Huang Weller discovered that the ext4 filesystem implementation in the
Linux kernel mishandled a needs-flushing-before-commit list. A local
attacker could use this to expose sensitive information. (CVE-2017-7495)

It was discovered that a buffer overflow existed in the Broadcom FullMAC
WLAN driver in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2017-7541)

It was discovered that the Linux kernel did not honor the UEFI secure boot
mode when performing a kexec operation. A local attacker could use this to
bypass secure boot restrictions. (CVE-2015-7837)

Update instructions

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

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
16.04 xenial linux-image-4.4.0-1028-gke –  4.4.0-1028.28
linux-image-4.4.0-1032-aws –  4.4.0-1032.41
linux-image-4.4.0-1071-raspi2 –  4.4.0-1071.79
linux-image-4.4.0-1073-snapdragon –  4.4.0-1073.78
linux-image-4.4.0-93-generic –  4.4.0-93.116
linux-image-4.4.0-93-generic-lpae –  4.4.0-93.116
linux-image-4.4.0-93-lowlatency –  4.4.0-93.116
linux-image-4.4.0-93-powerpc-e500mc –  4.4.0-93.116
linux-image-4.4.0-93-powerpc-smp –  4.4.0-93.116
linux-image-4.4.0-93-powerpc64-emb –  4.4.0-93.116
linux-image-4.4.0-93-powerpc64-smp –  4.4.0-93.116

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References

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