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Ubuntu 15.10: USN-2947-3 Critical DoS Threats in Linux Kernel

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Calendar Grey April 6, 2016
Scroller Ubuntu
Kernel weaknesses addressed for Ubuntu 15.10, essential patches for ensuring system protection and reliability.
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:

Ralf Spenneberg discovered that the usbvision driver in the Linux kernel

did not properly sanity check the interfaces and endpoints reported by the

device. An attacker with physical access could cause a denial of service

(system crash). (CVE-2015-7833)

Venkatesh Pottem discovered a use-after-free vulnerability in the Linux

kernel's CXGB3 driver. A local attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2015-8812)

Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux

Extended Verification Module (EVM). An attacker could use this to affect

system integrity. (CVE-2016-2085)

It was discovered that the extended Berkeley Packet Filter (eBPF)

implementation in the Linux kernel did not correctly compute branch offsets

for backward jumps after ctx expansion. A local attacker cou...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory ubuntu system crash dos linux kernel

Update Instructions

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

Ubuntu 15.10:
  linux-image-4.2.0-1028-raspi2   4.2.0-1028.36

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-2947-3

https://ubuntu.com/security/notices/USN-2947-1

CVE-2015-7833, CVE-2015-8812, CVE-2016-2085, CVE-2016-2383,

CVE-2016-2550, CVE-2016-2847

Severity
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Critical

April 06, 2016

Topics%20covered

Topics Covered

security advisory ubuntu system crash dos linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi2/4.2.0-1028.36

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