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Ubuntu 11.04 USN-1281-1 Critical: Kernel Access And DoS Issues

ubuntu
Calendar Grey November 24, 2011
Scroller Ubuntu
Numerous essential security patches for Ubuntu 11.04 released to address vulnerabilities in the kernel and enhance access permissions.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-ti-omap4: Linux kernel for OMAP4

Details:

Andrea Righi discovered a race condition in the KSM memory merging support.

If KSM was being used, a local attacker could exploit this to crash the

system, leading to a denial of service. (CVE-2011-2183)

It was discovered that an mmap() call with the MAP_PRIVATE flag on

"/dev/zero" was incorrectly handled. A local attacker could exploit this to

crash the system, leading to a denial of service. (CVE-2011-2479)

Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly

handled unlock requests. A local attacker could exploit this to cause a

denial of service. (CVE-2011-2491)

Vasiliy Kulikov discovered that taskstats did not enforce access

restrictions. A local attacker could exploit this to read certain

information, leading to a loss of privacy. (CVE-2011-2494)

Vasiliy Kulikov discovered that /proc/PID/io did not enforce acc...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical access control linux-ti-omap4

Update Instructions

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

Ubuntu 11.04:
  linux-image-2.6.38-1209-omap4   2.6.38-1209.17

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

https://ubuntu.com/security/notices/USN-1281-1

CVE-2011-2183, CVE-2011-2479, CVE-2011-2491, CVE-2011-2494,

CVE-2011-2495, CVE-2011-2496, CVE-2011-2517, CVE-2011-2905,

CVE-2011-2909, CVE-2011-3363

Severity
critical
Lowest
Low
Medium
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Critical

November 24, 2011

Topics%20covered

Topics Covered

security advisory denial of service critical access control linux-ti-omap4

Package Information

https://launchpad.net/ubuntu/+source/linux-ti-omap4/2.6.38-1209.17

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