7.8 - USN-2713-1

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