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Ubuntu 14.04 LTS USN-2466-1 Critical: Kernel Flaw Denial of Service

ubuntu
Calendar Grey January 13, 2015
Dist Ubuntu Esm H88
A significant vulnerability in the Linux kernel has been addressed in Ubuntu 14.04 LTS. It is essential to implement the required updates to fortify your system immediately.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

A null pointer dereference flaw was discovered in the the Linux kernel's

SCTP implementation when ASCONF is used. A remote attacker could exploit

this flaw to cause a denial of service (system crash) via a malformed INIT

chunk. (CVE-2014-7841)

A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual

Machine) subsystem of the Linux kernel was discovered. A guest OS user

could exploit this flaw to cause a denial of service (guest OS crash) via a

specially crafted application. (CVE-2014-7842)

Miloš Prchlík reported a flaw in how the ARM64 platform handles a single

byte overflow in __clear_user. A local user could exploit this flaw to

cause a denial of service (system crash) by reading one byte beyond a

/dev/zero page boundary. (CVE-2014-7843)

A stack buffer overflow was discovered in the ioctl command handling for

the Technotrend/Haup...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service remote exploit kernel flaw ubuntu

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-44-generic   3.13.0-44.73
  linux-image-3.13.0-44-generic-lpae  3.13.0-44.73
  linux-image-3.13.0-44-lowlatency  3.13.0-44.73
  linux-image-3.13.0-44-powerpc-e500  3.13.0-44.73
  linux-image-3.13.0-44-powerpc-e500mc  3.13.0-44.73
  linux-image-3.13.0-44-powerpc-smp  3.13.0-44.73
  linux-image-3.13.0-44-powerpc64-emb  3.13.0-44.73
  linux-image-3.13.0-44-powerpc64-smp  3.13.0-44.73

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-2466-1

CVE-2014-7841, CVE-2014-7842, CVE-2014-7843, CVE-2014-8884

Severity
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January 13, 2015

Topics%20covered

Topics Covered

security advisory denial of service remote exploit kernel flaw ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-44.73

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