U radu jezgre operacijskog sustava Ubuntu 11.04 otkriveno je nekoliko sigurnosnih ranjivosti. Lokalni ih napadači mogu iskoristiti za pregled povjerljivih podataka i izvođenje napada uskraćivanjem usluge.

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Ubuntu Security Notice USN-1567-1
September 14, 2012

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

- Ubuntu 11.04

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

A flaw was found in how the Linux kernel passed the replacement session
keyring to a child process. An unprivileged local user could exploit this
flaw to cause a denial of service (panic). (CVE-2012-2745)

Ben Hutchings reported a flaw in the Linux kernel with some network drivers
that support TSO (TCP segment offload). A local or peer user could exploit
this flaw to to cause a denial of service. (CVE-2012-3412)

Jay Fenlason and Doug Ledford discovered a bug in the Linux kernel
implementation of RDS sockets. A local unprivileged user could potentially
use this flaw to read privileged information from the kernel.
(CVE-2012-3430)

A flaw was discovered in the madvise feature of the Linux kernel's memory
subsystem. An unprivileged local use could exploit the flaw to cause a
denial of service (crash the system). (CVE-2012-3511)

Update instructions:

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

Ubuntu 11.04:
  linux-image-2.6.38-16-generic   2.6.38-16.67
  linux-image-2.6.38-16-generic-pae  2.6.38-16.67
  linux-image-2.6.38-16-omap      2.6.38-16.67
  linux-image-2.6.38-16-powerpc   2.6.38-16.67
  linux-image-2.6.38-16-powerpc-smp  2.6.38-16.67
  linux-image-2.6.38-16-powerpc64-smp  2.6.38-16.67
  linux-image-2.6.38-16-server    2.6.38-16.67
  linux-image-2.6.38-16-versatile  2.6.38-16.67
  linux-image-2.6.38-16-virtual   2.6.38-16.67

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-1567-1
  CVE-2012-2745, CVE-2012-3412, CVE-2012-3430, CVE-2012-3511

Package Information:
  https://launchpad.net/ubuntu/+source/linux/2.6.38-16.67