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Ubuntu 15.10 USN-2843-3 Critical: linux-raspi2 Denial of Service Issue

ubuntu
Calendar Grey December 17, 2015
Scroller Ubuntu
Several security issues were fixed in Ubuntu's linux-raspi2 kernel impacting various configurations and stability.
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:

郭永刚 discovered that the ppp implementation in the Linux kernel did

not ensure that certain slot numbers are valid. A local attacker with the

privilege to call ioctl() on /dev/ppp could cause a denial of service

(system crash). (CVE-2015-7799)

Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted

to garbage collect incompletely instantiated keys. A local unprivileged

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

(CVE-2015-7872)

It was discovered that the virtual video osd test driver in the Linux

kernel did not properly initialize data structures. A local attacker could

use this to obtain sensitive information from the kernel. (CVE-2015-7884)

It was discovered that the driver for Digi Neo and ClassicBoard devices did

not properly initialize data structures. A local attacker coul...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu linux-raspi2

Update Instructions

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

Ubuntu 15.10:
  linux-image-4.2.0-1016-raspi2   4.2.0-1016.23

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-2843-3

https://ubuntu.com/security/notices/USN-2843-1

CVE-2015-7799, CVE-2015-7872, CVE-2015-7884, CVE-2015-7885

Severity
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Critical

December 17, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu linux-raspi2

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi2/4.2.0-1016.23

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