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Ubuntu 16.04 LTS USN-3070-1 Critical: Kernel Access Control and DoS Fixes

ubuntu
Calendar Grey August 29, 2016
Scroller Ubuntu
Essential kernel patches for Ubuntu 16.04 address vulnerabilities in access management and Denial of Service (DoS) threats. Ensure your system is safe with these vital updates.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

A missing permission check when settings ACLs was discovered in nfsd. A

local user could exploit this flaw to gain access to any file by setting an

ACL. (CVE-2016-1237)

Kangjie Lu discovered an information leak in the Reliable Datagram Sockets

(RDS) implementation in the Linux kernel. A local attacker could use this

to obtain potentially sensitive information from kernel memory.

(CVE-2016-5244)

James Patrick-Evans discovered that the airspy USB device driver in the

Linux kernel did not properly handle certain error conditions. An attacker

with physical access could use this to cause a denial of service (memory

consumption). (CVE-2016-5400)

Yue Cao et al discovered a flaw in the TCP implementation's handling of

challenge acks in the Linux kernel. A remote attacker could use this to

cause a denial of service (reset connection) or inject content into an TCP

stream. (CVE-2016-56...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service update access control kernel ubuntu linux

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-36-generic    4.4.0-36.55
  linux-image-4.4.0-36-generic-lpae  4.4.0-36.55
  linux-image-4.4.0-36-lowlatency  4.4.0-36.55
  linux-image-4.4.0-36-powerpc-e500mc  4.4.0-36.55
  linux-image-4.4.0-36-powerpc-smp  4.4.0-36.55
  linux-image-4.4.0-36-powerpc64-emb  4.4.0-36.55
  linux-image-4.4.0-36-powerpc64-smp  4.4.0-36.55

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-3070-1

CVE-2016-1237, CVE-2016-5244, CVE-2016-5400, CVE-2016-5696,

CVE-2016-5728, CVE-2016-5828, CVE-2016-5829, CVE-2016-6197

Severity
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Critical

August 29, 2016

Topics%20covered

Topics Covered

security advisory denial of service update access control kernel ubuntu linux

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-36.55

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