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USN-3405-1: Linux kernel vulnerabilities

28 August 2017

Several security issues were fixed in the Linux kernel.

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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 local attacker could use this to
bypass secure boot restrictions. (CVE-2015-7837)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 16.04

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

Related notices

  • USN-3405-2: linux-lts-xenial, linux-image-4.4.0-93-lowlatency, linux-image-4.4.0-93-generic-lpae, linux-image-4.4.0-93-powerpc64-emb, linux-image-4.4.0-93-powerpc-smp, linux-image-extra-4.4.0-93-generic, linux-image-4.4.0-93-generic, linux-image-4.4.0-93-powerpc-e500mc, linux-image-4.4.0-93-powerpc64-smp
  • USN-3468-2: linux-hwe, linux-image-4.10.0-38-generic, linux-image-4.10.0-38-generic-lpae, linux-image-extra-4.10.0-38-generic, linux-image-4.10.0-38-lowlatency
  • USN-3468-3: linux-image-4.10.0-1008-gcp, linux-gcp, linux-image-extra-4.10.0-1008-gcp
  • USN-3470-2: linux-image-3.13.0-135-generic-lpae, linux-image-3.13.0-135-generic, linux-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty
  • USN-3470-1: linux-image-3.13.0-135-generic-lpae, linux-image-3.13.0-135-powerpc-smp, linux-image-3.13.0-135-generic, linux-image-3.13.0-135-powerpc64-emb, linux, linux-image-3.13.0-135-powerpc-e500, linux-image-3.13.0-135-powerpc-e500mc, linux-image-3.13.0-135-lowlatency, linux-image-3.13.0-135-powerpc64-smp, linux-image-extra-3.13.0-135-generic
  • USN-3468-1: linux-image-4.10.0-1020-raspi2, linux-image-4.10.0-38-generic, linux-image-generic-lpae, linux-image-4.10.0-38-generic-lpae, linux-image-lowlatency, linux, linux-image-4.10.0-38-lowlatency, linux-raspi2, linux-image-generic, linux-image-raspi2
  • USN-3406-1: linux-image-3.13.0-129-generic-lpae, linux-image-3.13.0-129-powerpc-e500, linux-image-3.13.0-129-generic, linux-image-3.13.0-129-powerpc-e500mc, linux-image-3.13.0-129-powerpc64-emb, linux, linux-image-3.13.0-129-powerpc-smp, linux-image-3.13.0-129-powerpc64-smp, linux-image-3.13.0-129-lowlatency, linux-image-extra-3.13.0-129-generic
  • USN-3406-2: linux-image-3.13.0-129-generic-lpae, linux-image-3.13.0-129-generic, linux-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty
  • USN-3419-1: linux-image-4.10.0-35-lowlatency, linux-image-4.10.0-35-generic-lpae, linux-image-generic-lpae, linux-image-lowlatency, linux, linux-image-4.10.0-1018-raspi2, linux-image-generic, linux-raspi2, linux-image-4.10.0-35-generic, linux-image-raspi2
  • USN-3419-2: linux-image-4.10.0-35-lowlatency, linux-image-4.10.0-35-generic-lpae, linux-hwe, linux-image-extra-4.10.0-35-generic, linux-image-4.10.0-35-generic
  • USN-3422-2: linux-image-3.13.0-132-generic, linux-lts-trusty, linux-image-3.13.0-132-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty
  • USN-3422-1: linux-image-3.13.0-132-generic, linux-image-3.13.0-132-powerpc64-emb, linux-image-3.13.0-132-powerpc64-smp, linux-image-3.13.0-132-powerpc-e500, linux, linux-image-3.13.0-132-generic-lpae, linux-image-3.13.0-132-powerpc-smp, linux-image-extra-3.13.0-132-generic, linux-image-3.13.0-132-powerpc-e500mc, linux-image-3.13.0-132-lowlatency

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