星球 - USN-3084-3: Linux kernel (Raspberry Pi 2) vulnerabilities

來自:Ubuntu security notices | 2016/9/24 4:42:54

Ubuntu Security Notice USN-3084-3


19th September, 2016


linux-raspi2 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-raspi2
    - Linux kernel for Raspberry Pi 2







Details


Pengfei Wang discovered a race condition in the audit subsystem in the
Linux kernel. A local attacker could use this to corrupt audit logs or
disrupt system-call auditing. (CVE-2016-6136)



It was discovered that the powerpc and powerpc64 hypervisor-mode KVM
implementation in the Linux kernel for did not properly maintain state
about transactional memory. An unprivileged attacker in a guest could cause
a denial of service (CPU lockup) in the host OS. (CVE-2016-5412)



Pengfei Wang discovered a race condition in the Chrome OS embedded
controller device driver in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash). (CVE-2016-6156)



Update instructions


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




Ubuntu 16.04 LTS:




linux-image-4.4.0-1023-raspi2

4.4.0-1023.29






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-2016-5412,

CVE-2016-6136,

CVE-2016-6156