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USN-3053-1: Linux kernel (Vivid HWE) vulnerabilities

10 August 2016

Several security issues were fixed in the kernel.

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Releases

Packages

Details

A missing permission check when settings ACLs was discovered in nfsd. A
local user could exploit this flaw to gain access to any file by setting an
ACL. (CVE-2016-1237)

It was discovered that the keyring implementation in the Linux kernel did
not ensure a data structure was initialized before referencing it after an
error condition occurred. A local attacker could use this to cause a denial
of service (system crash). (CVE-2016-4470)

Sasha Levin discovered that a use-after-free existed in the percpu
allocator in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code with
administrative privileges. (CVE-2016-4794)

Kangjie Lu discovered an information leak in the netlink implementation of
the Linux kernel. A local attacker could use this to obtain sensitive
information from kernel memory. (CVE-2016-5243)

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.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 14.04

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.

Related notices

  • USN-3070-1: linux-image-4.4.0-36-powerpc64-smp, linux, linux-image-4.4.0-36-powerpc-e500mc, linux-image-4.4.0-36-powerpc-smp, linux-image-4.4.0-36-generic-lpae, linux-image-4.4.0-36-powerpc64-emb, linux-image-extra-4.4.0-36-generic, linux-image-4.4.0-36-lowlatency, linux-image-4.4.0-36-generic
  • USN-3070-2: linux-image-4.4.0-1021-raspi2, linux-raspi2
  • USN-3070-3: linux-image-4.4.0-1024-snapdragon, linux-snapdragon
  • USN-3070-4: linux-lts-xenial, linux-image-4.4.0-36-powerpc64-smp, linux-image-4.4.0-36-powerpc-e500mc, linux-image-4.4.0-36-powerpc-smp, linux-image-4.4.0-36-generic-lpae, linux-image-4.4.0-36-powerpc64-emb, linux-image-extra-4.4.0-36-generic, linux-image-4.4.0-36-lowlatency, linux-image-4.4.0-36-generic
  • USN-3052-1: linux-image-3.13.0-93-powerpc-e500, linux-image-3.13.0-93-powerpc64-smp, linux-image-extra-3.13.0-93-generic, linux-image-3.13.0-93-generic, linux, linux-image-3.13.0-93-powerpc-smp, linux-image-3.13.0-93-powerpc64-emb, linux-image-3.13.0-93-generic-lpae, linux-image-3.13.0-93-powerpc-e500mc, linux-image-3.13.0-93-lowlatency
  • USN-3057-1: linux-image-4.4.0-1022-snapdragon, linux-snapdragon
  • USN-3054-1: linux-lts-xenial, linux-image-4.4.0-34-generic-lpae, linux-image-4.4.0-34-powerpc-smp, linux-image-4.4.0-34-powerpc-e500mc, linux-image-extra-4.4.0-34-generic, linux-image-4.4.0-34-generic, linux-image-4.4.0-34-powerpc64-emb, linux-image-4.4.0-34-powerpc64-smp, linux-image-4.4.0-34-lowlatency
  • USN-3050-1: linux-ti-omap4, linux-image-3.2.0-1485-omap4
  • USN-3056-1: linux-raspi2, linux-image-4.4.0-1019-raspi2
  • USN-3051-1: linux-image-3.13.0-93-generic-lpae, linux-image-3.13.0-93-generic, linux-lts-trusty
  • USN-3055-1: linux, linux-image-4.4.0-34-generic-lpae, linux-image-4.4.0-34-powerpc-smp, linux-image-4.4.0-34-powerpc-e500mc, linux-image-extra-4.4.0-34-generic, linux-image-4.4.0-34-generic, linux-image-4.4.0-34-powerpc64-emb, linux-image-4.4.0-34-powerpc64-smp, linux-image-4.4.0-34-lowlatency
  • USN-3049-1: linux-image-3.2.0-107-omap, linux-image-3.2.0-107-generic-pae, linux-image-3.2.0-107-generic, linux, linux-image-3.2.0-107-powerpc64-smp, linux-image-3.2.0-107-highbank, linux-image-3.2.0-107-virtual, linux-image-3.2.0-107-powerpc-smp