[USN-2713-1] Linux kernel vulnerabilities

[John Johansen]

==========================================================================
Ubuntu Security Notice USN-2713-1
August 18, 2015

linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Marcelo Ricardo Leitner discovered a race condition in the Linux kernel's
SCTP address configuration lists when using Address Configuration Change
(ASCONF) options on a socket. An unprivileged local user could exploit this
flaw to cause a denial of service (system crash). (CVE-2015-3212)

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker could exploit this flaw to cause a denial of
service using a flood of UDP packets with invalid checksums.
(CVE-2015-5364)

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker can cause a denial of service against
applications that use epoll by injecting a single packet with an invalid
checksum. (CVE-2015-5366)

Update instructions:

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-89-generic    3.2.0-89.127
  linux-image-3.2.0-89-generic-pae  3.2.0-89.127
  linux-image-3.2.0-89-highbank   3.2.0-89.127
  linux-image-3.2.0-89-omap       3.2.0-89.127
  linux-image-3.2.0-89-powerpc-smp  3.2.0-89.127
  linux-image-3.2.0-89-powerpc64-smp  3.2.0-89.127
  linux-image-3.2.0-89-virtual    3.2.0-89.127

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
  http://www.ubuntu.com/usn/usn-2713-1
  CVE-2015-3212, CVE-2015-5364, CVE-2015-5366

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-89.127


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