USN-2858-1: Linux kernel vulnerability
5 January 2016
The system could be made to run programs as an administrator.
Releases
Packages
- linux - Linux kernel
Details
Nathan Williams discovered that overlayfs in the Linux kernel incorrectly
handled setattr operations. A local unprivileged attacker could use this to
create files with administrative permission attributes and execute
arbitrary code with elevated privileges.
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 15.10
-
linux-image-4.2.0-23-powerpc64-emb
-
4.2.0-23.28
-
linux-image-4.2.0-23-lowlatency
-
4.2.0-23.28
-
linux-image-4.2.0-23-powerpc64-smp
-
4.2.0-23.28
-
linux-image-4.2.0-23-generic
-
4.2.0-23.28
-
linux-image-4.2.0-23-powerpc-smp
-
4.2.0-23.28
-
linux-image-4.2.0-23-generic-lpae
-
4.2.0-23.28
-
linux-image-4.2.0-23-powerpc-e500mc
-
4.2.0-23.28
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-2857-2: linux-image-3.19.0-43-generic-lpae, linux-image-extra-3.19.0-43-generic, linux-image-3.19.0-43-powerpc64-smp, linux-image-3.19.0-43-powerpc-smp, linux-image-3.19.0-43-generic, linux-image-3.19.0-43-lowlatency, linux-image-3.19.0-43-powerpc64-emb, linux-image-3.19.0-43-powerpc-e500mc, linux-lts-vivid
- USN-2857-1: linux-image-3.19.0-43-generic-lpae, linux-image-3.19.0-43-powerpc64-smp, linux-image-3.19.0-43-powerpc-smp, linux-image-3.19.0-43-generic, linux-image-3.19.0-43-lowlatency, linux-image-3.19.0-43-powerpc64-emb, linux, linux-image-3.19.0-43-powerpc-e500mc
- USN-2858-2: linux-image-4.2.0-23-powerpc-e500mc, linux-image-4.2.0-23-generic-lpae, linux-image-4.2.0-23-powerpc-smp, linux-image-4.2.0-23-generic, linux-image-4.2.0-23-lowlatency, linux-image-4.2.0-23-powerpc64-emb, linux-lts-wily, linux-image-4.2.0-23-powerpc64-smp, linux-image-extra-4.2.0-23-generic
- USN-2858-3: linux-raspi2, linux-image-4.2.0-1018-raspi2