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[USN-2590-1] Linux kernel vulnerabilities

Posted on 30 April 2015
Ubuntu Security

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Ubuntu Security Notice USN-2590-1
April 30, 2015

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

- Ubuntu 14.10

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Jan Beulich discovered the Xen virtual machine subsystem of the Linux
kernel did not properly restrict access to PCI command registers. A local=

guest user could exploit this flaw to cause a denial of service (host
crash). (CVE-2015-2150)

A stack overflow was discovered in the the microcode loader for the intel=

x86 platform. A local attacker could exploit this flaw to cause a denial =
of
service (kernel crash) or to potentially execute code with kernel
privileges. (CVE-2015-2666)

A privilege escalation was discovered in the fork syscal vi the int80 ent=
ry
on 64 bit kernels with 32 bit emulation support. An unprivileged local
attacker could exploit this flaw to increase their privileges on the
system. (CVE-2015-2830)

It was discovered that the Linux kernel's IPv6 networking stack has a fla=
w
that allows using route advertisement (RA) messages to set the 'hop_limit=
'
to values that are too low. An unprivileged attacker on a local network
could exploit this flaw to cause a denial of service (IPv6 messages
dropped). (CVE-2015-2922)

Update instructions:

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

Ubuntu 14.10:
linux-image-3.16.0-36-generic 3.16.0-36.48
linux-image-3.16.0-36-generic-lpae 3.16.0-36.48
linux-image-3.16.0-36-lowlatency 3.16.0-36.48
linux-image-3.16.0-36-powerpc-e500mc 3.16.0-36.48
linux-image-3.16.0-36-powerpc-smp 3.16.0-36.48
linux-image-3.16.0-36-powerpc64-emb 3.16.0-36.48
linux-image-3.16.0-36-powerpc64-smp 3.16.0-36.48

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 automaticall=
y
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2590-1
CVE-2015-2150, CVE-2015-2666, CVE-2015-2830, CVE-2015-2922

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.16.0-36.48

 

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