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USN-2889-2: Linux kernel (Vivid HWE) vulnerabilities

2 February 2016

Several security issues were fixed in the kernel.

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Releases

Packages

Details

It was discovered that a use-after-free vulnerability existed in the
AF_UNIX implementation in the Linux kernel. A local attacker could use
crafted epoll_ctl calls to cause a denial of service (system crash) or
expose sensitive information. (CVE-2013-7446)

It was discovered that the KVM implementation in the Linux kernel did not
properly restore the values of the Programmable Interrupt Timer (PIT). A
user-assisted attacker in a KVM guest could cause a denial of service in
the host (system crash). (CVE-2015-7513)

Sasha Levin discovered that the Reliable Datagram Sockets (RDS)
implementation in the Linux kernel had a race condition when checking
whether a socket was bound or not. A local attacker could use this to cause
a denial of service (system crash). (CVE-2015-7990)

It was discovered that the Btrfs implementation in the Linux kernel
incorrectly handled compressed inline extants on truncation. A local
attacker could use this to expose sensitive information. (CVE-2015-8374)

It was discovered that the netfilter Network Address Translation (NAT)
implementation did not ensure that data structures were initialized when
handling IPv4 addresses. An attacker could use this to cause a denial of
service (system crash). (CVE-2015-8787)

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-2887-2: linux-lts-trusty, linux-image-3.13.0-77-generic, linux-image-3.13.0-77-generic-lpae
  • USN-2887-1: linux-image-3.13.0-77-generic, linux-image-3.13.0-77-lowlatency, linux-image-3.13.0-77-generic-lpae, linux, linux-image-extra-3.13.0-77-generic, linux-image-3.13.0-77-powerpc-e500mc, linux-image-3.13.0-77-powerpc64-smp, linux-image-3.13.0-77-powerpc-e500, linux-image-3.13.0-77-powerpc64-emb, linux-image-3.13.0-77-powerpc-smp
  • USN-2890-2: linux-image-4.2.0-27-lowlatency, linux-image-4.2.0-27-powerpc64-smp, linux-image-4.2.0-27-generic, linux-image-4.2.0-27-powerpc64-emb, linux-lts-wily, linux-image-4.2.0-27-generic-lpae, linux-image-4.2.0-27-powerpc-e500mc, linux-image-extra-4.2.0-27-generic, linux-image-4.2.0-27-powerpc-smp
  • USN-2886-2: linux-ti-omap4, linux-image-3.2.0-1476-omap4
  • USN-2886-1: linux-image-3.2.0-98-highbank, linux, linux-image-3.2.0-98-powerpc-smp, linux-image-3.2.0-98-virtual, linux-image-3.2.0-98-omap, linux-image-3.2.0-98-generic-pae, linux-image-3.2.0-98-powerpc64-smp, linux-image-3.2.0-98-generic
  • USN-2888-1: linux-lts-utopic, linux-image-3.16.0-60-generic-lpae, linux-image-3.16.0-60-generic, linux-image-3.16.0-60-powerpc64-emb, linux-image-3.16.0-60-powerpc64-smp, linux-image-3.16.0-60-powerpc-e500mc, linux-image-3.16.0-60-lowlatency, linux-image-extra-3.16.0-60-generic, linux-image-3.16.0-60-powerpc-smp
  • USN-2889-1: linux-image-3.19.0-49-lowlatency, linux-image-3.19.0-49-powerpc64-smp, linux, linux-image-3.19.0-49-powerpc64-emb, linux-image-3.19.0-49-powerpc-e500mc, linux-image-3.19.0-49-generic-lpae, linux-image-3.19.0-49-generic, linux-image-3.19.0-49-powerpc-smp
  • USN-2890-3: linux-raspi2, linux-image-4.2.0-1022-raspi2
  • USN-2890-1: linux-image-4.2.0-27-lowlatency, linux, linux-image-4.2.0-27-powerpc64-smp, linux-image-4.2.0-27-generic, linux-image-4.2.0-27-powerpc64-emb, linux-image-4.2.0-27-generic-lpae, linux-image-4.2.0-27-powerpc-e500mc, linux-image-4.2.0-27-powerpc-smp