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Ubuntu 16.04 LTS USN-3084-3 Critical: Kernel Denial Of Service Issues

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Calendar Grey September 19, 2016
Scroller Ubuntu
Updates resolving linux-raspi2 problems rolled out in Ubuntu 16.04 LTS. Major security flaws mitigated along with guidance on applying the upgrades.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

Pengfei Wang discovered a race condition in the audit subsystem in the

Linux kernel. A local attacker could use this to corrupt audit logs or

disrupt system-call auditing. (CVE-2016-6136)

It was discovered that the powerpc and powerpc64 hypervisor-mode KVM

implementation in the Linux kernel for did not properly maintain state

about transactional memory. An unprivileged attacker in a guest could cause

a denial of service (CPU lockup) in the host OS. (CVE-2016-5412)

Pengfei Wang discovered a race condition in the Chrome OS embedded

controller device driver in the Linux kernel. A local attacker could use

this to cause a denial of service (system crash). (CVE-2016-6156)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel Raspberry Pi audit subsystem

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1023-raspi2   4.4.0-1023.29

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

https://ubuntu.com/security/notices/USN-3084-1

CVE-2016-5412, CVE-2016-6136, CVE-2016-6156

Severity
critical
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Low
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Critical

September 19, 2016

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel Raspberry Pi audit subsystem

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1023.29

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