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Ubuntu Security Notice USN-2843-3

Ubuntu Security Notice USN-2843-3
Posted Dec 17, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2843-3 - =E9=83=AD=E6=B0=B8=E5=88=9A 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). 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). Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-7799, CVE-2015-7872, CVE-2015-7884, CVE-2015-7885
SHA-256 | 49334a6b730ea953bb24db7899076e4caa9a090dbe9937e4c72b50efb8cce3a4

Ubuntu Security Notice USN-2843-3

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Content-Disposition: inline


============================================================================
Ubuntu Security Notice USN-2843-3
December 17, 2015

linux-raspi2 vulnerabilities
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.10

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

=E9=83=AD=E6=B0=B8=E5=88=9A 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 could use this to
obtain sensitive information from the kernel. (CVE-2015-7885)

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:
http://www.ubuntu.com/usn/usn-2843-3
http://www.ubuntu.com/usn/usn-2843-1
CVE-2015-7799, CVE-2015-7872, CVE-2015-7884, CVE-2015-7885

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