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USN-2886-1: Linux kernel vulnerabilities

1 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)

郭永刚 discovered that the ppp implementation in the Linux kernel did
not ensure that certain slot numbers are valid. A local attacker with the
privilege to call ioctl() on /dev/ppp could cause a denial of service
(system crash). (CVE-2015-7799)

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)

郭永刚 discovered that the Linux kernel networking implementation did
not validate protocol identifiers for certain protocol families, A local
attacker could use this to cause a denial of service (system crash) or
possibly gain administrative privileges. (CVE-2015-8543)

Dmitry Vyukov discovered that the pptp implementation in the Linux kernel
did not verify an address length when setting up a socket. A local attacker
could use this to craft an application that exposed sensitive information
from kernel memory. (CVE-2015-8569)

David Miller discovered that the Bluetooth implementation in the Linux
kernel did not properly validate the socket address length for Synchronous
Connection-Oriented (SCO) sockets. A local attacker could use this to
expose sensitive information. (CVE-2015-8575)

It was discovered that the Linux kernel's Filesystem in Userspace (FUSE)
implementation did not handle initial zero length segments properly. A
local attacker could use this to cause a denial of service (unkillable
task). (CVE-2015-8785)

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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 12.04

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-2889-2: linux-image-3.19.0-49-powerpc64-emb, linux-image-3.19.0-49-generic-lpae, linux-image-3.19.0-49-lowlatency, linux-image-3.19.0-49-generic, linux-image-extra-3.19.0-49-generic, linux-image-3.19.0-49-powerpc64-smp, linux-image-3.19.0-49-powerpc-smp, linux-lts-vivid, linux-image-3.19.0-49-powerpc-e500mc
  • USN-2887-2: linux-image-3.13.0-77-generic-lpae, linux-image-3.13.0-77-generic, linux-lts-trusty
  • USN-2887-1: linux, linux-image-3.13.0-77-generic-lpae, linux-image-3.13.0-77-lowlatency, linux-image-3.13.0-77-powerpc64-smp, linux-image-3.13.0-77-generic, linux-image-3.13.0-77-powerpc-e500mc, linux-image-3.13.0-77-powerpc-smp, linux-image-3.13.0-77-powerpc64-emb, linux-image-3.13.0-77-powerpc-e500, linux-image-extra-3.13.0-77-generic
  • USN-2890-2: linux-lts-wily, linux-image-4.2.0-27-powerpc-smp, linux-image-4.2.0-27-generic, linux-image-4.2.0-27-lowlatency, linux-image-extra-4.2.0-27-generic, linux-image-4.2.0-27-powerpc64-smp, linux-image-4.2.0-27-powerpc64-emb, linux-image-4.2.0-27-powerpc-e500mc, linux-image-4.2.0-27-generic-lpae
  • USN-2886-2: linux-image-3.2.0-1476-omap4, linux-ti-omap4
  • USN-2888-1: linux-image-3.16.0-60-powerpc-smp, linux-image-extra-3.16.0-60-generic, linux-image-3.16.0-60-powerpc64-smp, linux-image-3.16.0-60-lowlatency, linux-lts-utopic, linux-image-3.16.0-60-generic-lpae, linux-image-3.16.0-60-powerpc-e500mc, linux-image-3.16.0-60-powerpc64-emb, linux-image-3.16.0-60-generic
  • USN-2889-1: linux, linux-image-3.19.0-49-powerpc64-emb, linux-image-3.19.0-49-generic-lpae, linux-image-3.19.0-49-lowlatency, linux-image-3.19.0-49-generic, linux-image-3.19.0-49-powerpc64-smp, linux-image-3.19.0-49-powerpc-smp, linux-image-3.19.0-49-powerpc-e500mc
  • USN-2890-3: linux-raspi2, linux-image-4.2.0-1022-raspi2
  • USN-2890-1: linux, linux-image-4.2.0-27-generic, linux-image-4.2.0-27-powerpc-smp, linux-image-4.2.0-27-lowlatency, linux-image-4.2.0-27-powerpc64-smp, linux-image-4.2.0-27-powerpc64-emb, linux-image-4.2.0-27-powerpc-e500mc, linux-image-4.2.0-27-generic-lpae
  • USN-2843-2: linux-image-4.2.0-21-powerpc-smp, linux-image-4.2.0-21-powerpc64-smp, linux-lts-wily, linux-image-4.2.0-21-powerpc-e500mc, linux-image-extra-4.2.0-21-generic, linux-image-4.2.0-21-generic, linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-lowlatency, linux-image-4.2.0-21-generic-lpae
  • USN-2842-2: linux-image-3.19.0-41-powerpc64-smp, linux-image-3.19.0-41-generic, linux-image-extra-3.19.0-41-generic, linux-image-3.19.0-41-generic-lpae, linux-image-3.19.0-41-lowlatency, linux-image-3.19.0-41-powerpc-smp, linux-lts-vivid, linux-image-3.19.0-41-powerpc64-emb, linux-image-3.19.0-41-powerpc-e500mc
  • USN-2844-1: linux-image-3.16.0-56-generic, linux-image-3.16.0-56-generic-lpae, linux-lts-utopic, linux-image-3.16.0-56-powerpc64-smp, linux-image-3.16.0-56-powerpc-e500mc, linux-image-3.16.0-56-powerpc64-emb, linux-image-3.16.0-56-lowlatency, linux-image-3.16.0-56-powerpc-smp, linux-image-extra-3.16.0-56-generic
  • USN-2841-1: linux, linux-image-3.13.0-73-lowlatency, linux-image-extra-3.13.0-73-generic, linux-image-3.13.0-73-generic, linux-image-3.13.0-73-powerpc64-emb, linux-image-3.13.0-73-powerpc-e500mc, linux-image-3.13.0-73-generic-lpae, linux-image-3.13.0-73-powerpc-smp, linux-image-3.13.0-73-powerpc64-smp, linux-image-3.13.0-73-powerpc-e500
  • USN-2841-2: linux-image-3.13.0-73-generic, linux-lts-trusty, linux-image-3.13.0-73-generic-lpae
  • USN-2842-1: linux, linux-image-3.19.0-41-powerpc64-smp, linux-image-3.19.0-41-generic, linux-image-3.19.0-41-generic-lpae, linux-image-3.19.0-41-lowlatency, linux-image-3.19.0-41-powerpc-smp, linux-image-3.19.0-41-powerpc64-emb, linux-image-3.19.0-41-powerpc-e500mc
  • USN-2843-1: linux, linux-image-4.2.0-21-powerpc-smp, linux-image-4.2.0-21-powerpc64-smp, linux-image-4.2.0-21-powerpc-e500mc, linux-image-4.2.0-21-generic, linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-lowlatency, linux-image-4.2.0-21-generic-lpae
  • USN-2843-3: linux-raspi2, linux-image-4.2.0-1016-raspi2
  • USN-2910-1: linux-image-3.19.0-51-powerpc-smp, linux-lts-vivid, linux-image-3.19.0-51-generic, linux-image-3.19.0-51-powerpc-e500mc, linux-image-3.19.0-51-powerpc64-emb, linux-image-extra-3.19.0-51-generic, linux-image-3.19.0-51-generic-lpae, linux-image-3.19.0-51-lowlatency, linux-image-3.19.0-51-powerpc64-smp
  • USN-2907-1: linux, linux-image-3.13.0-79-powerpc-e500mc, linux-image-3.13.0-79-generic, linux-image-3.13.0-79-powerpc64-emb, linux-image-extra-3.13.0-79-generic, linux-image-3.13.0-79-powerpc-e500, linux-image-3.13.0-79-powerpc64-smp, linux-image-3.13.0-79-powerpc-smp, linux-image-3.13.0-79-lowlatency, linux-image-3.13.0-79-generic-lpae
  • USN-2907-2: linux-lts-trusty, linux-image-3.13.0-79-generic, linux-image-3.13.0-79-generic-lpae
  • USN-2909-1: linux-lts-utopic, linux-image-3.16.0-62-powerpc-smp, linux-image-3.16.0-62-powerpc-e500mc, linux-image-3.16.0-62-powerpc64-emb, linux-image-3.16.0-62-powerpc64-smp, linux-image-3.16.0-62-lowlatency, linux-image-extra-3.16.0-62-generic, linux-image-3.16.0-62-generic, linux-image-3.16.0-62-generic-lpae
  • USN-2908-2: linux-image-4.2.0-30-lowlatency, linux-image-4.2.0-30-powerpc-e500mc, linux-image-4.2.0-30-powerpc64-smp, linux-image-4.2.0-30-generic, linux-lts-wily, linux-image-4.2.0-30-generic-lpae, linux-image-extra-4.2.0-30-generic, linux-image-4.2.0-30-powerpc-smp, linux-image-4.2.0-30-powerpc64-emb
  • USN-2908-3: linux-raspi2, linux-image-4.2.0-1025-raspi2
  • USN-2908-1: linux, linux-image-4.2.0-30-lowlatency, linux-image-4.2.0-30-powerpc-e500mc, linux-image-4.2.0-30-powerpc64-smp, linux-image-4.2.0-30-generic, linux-image-4.2.0-30-generic-lpae, linux-image-4.2.0-30-powerpc-smp, linux-image-4.2.0-30-powerpc64-emb

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