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USN-2889-1: Linux kernel vulnerabilities

2 February 2016

Several security issues were fixed in the kernel.




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)

Update instructions

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

Ubuntu 15.04

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