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Ubuntu 12.04 LTS USN-2444-1 Critical: OMAP4 Kernel Denial of Service

ubuntu
Calendar Grey December 12, 2014
Dist Ubuntu Esm H88
Concerns regarding safety in the linux-ti-omap4 kernel for Ubuntu have been resolved. Discover the enhancements and possible vulnerabilities.
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:

An information leak in the Linux kernel was discovered that could leak the

high 16 bits of the kernel stack address on 32-bit Kernel Virtual Machine

(KVM) paravirt guests. A user in the guest OS could exploit this leak to

obtain information that could potentially be used to aid in attacking the

kernel. (CVE-2014-8134)

Rabin Vincent, Robert Swiecki, Russell King discovered that the ftrace

subsystem of the Linux kernel does not properly handle private syscall

numbers. A local user could exploit this flaw to cause a denial of service

(OOPS). (CVE-2014-7826)

Rabin Vincent, Robert Swiecki, Russell Kinglaw discovered a flaw in how the

perf subsystem of the Linux kernel handles private systecall numbers. A

local user could exploit this to cause a denial of service (OOPS) or bypass

ASLR protections via a crafted application. (CVE-2014-7825)

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue information leak Ubuntu kernel OMAP4

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-1457-omap4    3.2.0-1457.77

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-2444-1

CVE-2014-7825, CVE-2014-7826, CVE-2014-7841, CVE-2014-8134,

CVE-2014-8884, CVE-2014-9090

Severity
critical
Lowest
Low
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Critical

December 12, 2014

Topics%20covered

Topics Covered

security advisory denial of service security issue information leak Ubuntu kernel OMAP4

Package Information

https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1457.77

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