Ubuntu Security Notice USN-2841-1
17th December, 2015
linux vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 14.04 LTS
Summary
Several security issues were fixed in the kernel.
Software description
- linux
– Linux kernel
Details
Jan Beulich discovered that the KVM svm hypervisor implementation in the
Linux kernel did not properly catch Debug exceptions on AMD processors. An
attacker in a guest virtual machine could use this to cause a denial of
service (system crash) in the host OS. (CVE-2015-8104)
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)
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 version:
- Ubuntu 14.04 LTS:
-
linux-image-3.13.0-73-powerpc-smp
3.13.0-73.116
-
linux-image-3.13.0-73-powerpc-e500
3.13.0-73.116
-
linux-image-3.13.0-73-powerpc64-smp
3.13.0-73.116
-
linux-image-3.13.0-73-powerpc64-emb
3.13.0-73.116
-
linux-image-3.13.0-73-powerpc-e500mc
3.13.0-73.116
-
linux-image-3.13.0-73-generic-lpae
3.13.0-73.116
-
linux-image-3.13.0-73-lowlatency
3.13.0-73.116
-
linux-image-3.13.0-73-generic
3.13.0-73.116
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
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
Source: ubuntu-usn
