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Ubuntu Security Notice USN-2634-1
June 10, 2015

linux vulnerabilities

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

• Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:

• linux: Linux kernel

Details:

Wen Xu discovered a use-after-free flaw in the Linux kernel's ipv4 ping
support. A local user could exploit this flaw to cause a denial of service
(system crash) or gain administrative privileges on the system.
(CVE-2015-3636)

A memory corruption flaw was discovered in the Linux kernel's scsi
subsystem. A local attacker could potentially exploit this flaw to cause a
denial of service (system crash). (CVE-2015-4036)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-54-generic 3.13.0-54.91
linux-image-3.13.0-54-generic-lpae 3.13.0-54.91
linux-image-3.13.0-54-lowlatency 3.13.0-54.91
linux-image-3.13.0-54-powerpc-e500 3.13.0-54.91
linux-image-3.13.0-54-powerpc-e500mc 3.13.0-54.91
linux-image-3.13.0-54-powerpc-smp 3.13.0-54.91
linux-image-3.13.0-54-powerpc64-emb 3.13.0-54.91
linux-image-3.13.0-54-powerpc64-smp 3.13.0-54.91

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-2634-1
CVE-2015-3636, CVE-2015-4036

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-54.91

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