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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)

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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 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.

References

Related notices

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

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Further reading