USN-3160-1: Linux kernel vulnerabilities
20 December 2016
Several security issues were fixed in the kernel.
Releases
Packages
- linux - Linux kernel
Details
CAI Qian discovered that shared bind mounts in a mount namespace
exponentially added entries without restriction to the Linux kernel's mount
table. A local attacker could use this to cause a denial of service (system
crash). (CVE-2016-6213)
It was discovered that a race condition existed in the procfs
environ_read function in the Linux kernel, leading to an integer
underflow. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2016-7916)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 14.04
-
linux-image-3.13.0-106-generic
-
3.13.0-106.153
-
linux-image-3.13.0-106-generic-lpae
-
3.13.0-106.153
-
linux-image-3.13.0-106-lowlatency
-
3.13.0-106.153
-
linux-image-3.13.0-106-powerpc-e500
-
3.13.0-106.153
-
linux-image-3.13.0-106-powerpc-e500mc
-
3.13.0-106.153
-
linux-image-3.13.0-106-powerpc-smp
-
3.13.0-106.153
-
linux-image-3.13.0-106-powerpc64-emb
-
3.13.0-106.153
-
linux-image-3.13.0-106-powerpc64-smp
-
3.13.0-106.153
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
Related notices
- USN-3162-2: linux-image-4.8.0-1021-raspi2, linux-raspi2, linux-image-raspi2
- USN-3162-1: linux-image-4.8.0-32-powerpc-smp, linux-image-lowlatency, linux-image-powerpc-smp, linux-image-generic-lpae, linux-image-4.8.0-32-powerpc64-emb, linux-image-4.8.0-32-lowlatency, linux-image-generic, linux-image-4.8.0-32-generic-lpae, linux-image-powerpc-e500mc, linux, linux-image-powerpc64-emb, linux-image-4.8.0-32-generic, linux-image-4.8.0-32-powerpc-e500mc
- USN-3160-2: linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-106-generic-lpae, linux-lts-trusty, linux-image-3.13.0-106-generic, linux-image-generic-lts-trusty
- USN-3161-4: linux-image-4.4.0-1042-snapdragon, linux-snapdragon
- USN-3161-1: linux-image-4.4.0-57-powerpc-e500mc, linux-image-4.4.0-57-lowlatency, linux-image-4.4.0-57-powerpc64-smp, linux-image-4.4.0-57-generic-lpae, linux-image-4.4.0-57-generic, linux-image-4.4.0-57-powerpc-smp, linux-image-extra-4.4.0-57-generic, linux-image-4.4.0-57-powerpc64-emb, linux
- USN-3161-3: linux-image-4.4.0-1038-raspi2, linux-raspi2
- USN-3161-2: linux-lts-xenial, linux-image-4.4.0-57-powerpc-e500mc, linux-image-4.4.0-57-lowlatency, linux-image-4.4.0-57-powerpc64-smp, linux-image-4.4.0-57-generic-lpae, linux-image-4.4.0-57-generic, linux-image-4.4.0-57-powerpc-smp, linux-image-extra-4.4.0-57-generic, linux-image-4.4.0-57-powerpc64-emb
- USN-3159-2: linux-image-omap4, linux-ti-omap4, linux-image-3.2.0-1497-omap4
- USN-3159-1: linux-image-3.2.0-119-virtual, linux-image-3.2.0-119-highbank, linux-image-powerpc-smp, linux-image-3.2.0-119-powerpc64-smp, linux-image-3.2.0-119-generic, linux-image-3.2.0-119-omap, linux-image-generic, linux-image-omap, linux-image-3.2.0-119-generic-pae, linux-image-powerpc64-smp, linux-image-virtual, linux-image-3.2.0-119-powerpc-smp, linux, linux-image-generic-pae, linux-image-highbank