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Ubuntu 16.04 LTS USN-2965-1: Critical Kernel Security Issues

ubuntu
Calendar Grey May 6, 2016
Scroller Ubuntu
Numerous kernel patches rectify numerous vulnerabilities and possible weaknesses within Ubuntu environments. Urgent updates recommended.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Jann Horn discovered that the extended Berkeley Packet Filter (eBPF)

implementation in the Linux kernel did not properly reference count file

descriptors, leading to a use-after-free. A local unprivileged attacker

could use this to gain administrative privileges. (CVE-2016-4557)

Ralf Spenneberg discovered that the USB sound subsystem in the Linux kernel

did not properly validate USB device descriptors. An attacker with physical

access could use this to cause a denial of service (system crash).

(CVE-2016-2184)

Ralf Spenneberg discovered that the ATI Wonder Remote II USB driver in the

Linux kernel did not properly validate USB device descriptors. An attacker

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

crash). (CVE-2016-2185)

Ralf Spenneberg discovered that the PowerMate USB driver in the Linux

kernel did not properly validate USB device descriptors...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel use-after-free

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-22-generic    4.4.0-22.39
  linux-image-4.4.0-22-generic-lpae  4.4.0-22.39
  linux-image-4.4.0-22-lowlatency  4.4.0-22.39
  linux-image-4.4.0-22-powerpc-e500mc  4.4.0-22.39
  linux-image-4.4.0-22-powerpc-smp  4.4.0-22.39
  linux-image-4.4.0-22-powerpc64-emb  4.4.0-22.39
  linux-image-4.4.0-22-powerpc64-smp  4.4.0-22.39

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-2965-1

CVE-2016-2184, CVE-2016-2185, CVE-2016-2186, CVE-2016-2188,

CVE-2016-3136, CVE-2016-3137, CVE-2016-3138, CVE-2016-3140,

CVE-2016-3156, CVE-2016-3157, CVE-2016-3672, CVE-2016-3689,

CVE-2016-3951, CVE-2016-3955, CVE-2016-4557

Severity
critical
Lowest
Low
Medium
High
Critical

May 06, 2016

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel use-after-free

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-22.39

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