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Ubuntu 12.04 LTS USN-2465-1 Moderate: Linux Kernel DoS Issues

ubuntu
Calendar Grey January 13, 2015
Dist Ubuntu Esm H88
Several vulnerabilities in the Ubuntu 12.04 LTS kernel have been resolved; essential system upgrades necessitate a restart and a recompilation process.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-trusty: Linux hardware enablement kernel from Trusty

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...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory kernel update instructions ubuntu system crash linux dos

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.13.0-44-generic   3.13.0-44.73~precise1
  linux-image-3.13.0-44-generic-lpae  3.13.0-44.73~precise1

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-2465-1

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

January 13, 2015

Topics%20covered

Topics Covered

security advisory kernel update instructions ubuntu system crash linux dos

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-44.73~precise1

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