星球 - USN-3057-1: Linux kernel (Qualcomm Snapdragon) vulnerabilities

來自:Ubuntu security notices | 2016/8/14 18:18:19

Ubuntu Security Notice USN-3057-1


10th August, 2016


linux-snapdragon vulnerabilities


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




  • Ubuntu 16.04 LTS





Summary


Several security issues were fixed in the kernel.





Software description





  • linux-snapdragon
    - Linux kernel for Snapdragon Processors







Details


Ben Hawkes discovered an integer overflow in the Linux netfilter
implementation. On systems running 32 bit kernels, a local unprivileged
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code with administrative privileges.
(CVE-2016-3135)



It was discovered that the keyring implementation in the Linux kernel did
not ensure a data structure was initialized before referencing it after an
error condition occurred. A local attacker could use this to cause a denial
of service (system crash). (CVE-2016-4470)



Sasha Levin discovered that a use-after-free existed in the percpu
allocator in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code with
administrative privileges. (CVE-2016-4794)



Kangjie Lu discovered an information leak in the netlink implementation of
the Linux kernel. A local attacker could use this to obtain sensitive
information from kernel memory. (CVE-2016-5243)



Update instructions


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




Ubuntu 16.04 LTS:




linux-image-4.4.0-1022-snapdragon

4.4.0-1022.25






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.
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




CVE-2016-3135,

CVE-2016-4470,

CVE-2016-4794,

CVE-2016-5243