Rapid7 Vulnerability & Exploit Database

Ubuntu: USN-2908-5: Linux kernel (Wily HWE) regression

Back to Search

Ubuntu: USN-2908-5: Linux kernel (Wily HWE) regression

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
02/27/2016
Created
07/25/2018
Added
02/27/2016
Modified
07/09/2020

Description

USN-2908-2 fixed vulnerabilities in the Ubuntu 15.10 Linux kernel backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a regression that broke graphics displays for Ubuntu 14.04 LTS guests running the Ubuntu 15.10 backport kernel within VMWare virtual machines. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount, incorrectly propagated file attributes, including setuid. A local unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly propagated security sensitive extended attributes, such as POSIX ACLs. A local unprivileged attacker could use this to gain privileges. (CVE-2016-1575)

It was discovered that the Linux kernel did not properly enforce rlimits for file descriptors sent over UNIX domain sockets. A local attacker could use this to cause a denial of service. (CVE-2013-4312)

It was discovered that the Linux kernel's Filesystem in Userspace (FUSE) implementation did not handle initial zero length segments properly. A local attacker could use this to cause a denial of service (unkillable task). (CVE-2015-8785)

Andy Lutomirski discovered a race condition in the Linux kernel's translation lookaside buffer (TLB) handling of flush events. A local attacker could use this to cause a denial of service or possibly leak sensitive information. (CVE-2016-2069)

Solution(s)

  • ubuntu-upgrade-linux-image-4-2-0-30-generic
  • ubuntu-upgrade-linux-image-4-2-0-30-generic-lpae
  • ubuntu-upgrade-linux-image-4-2-0-30-lowlatency
  • ubuntu-upgrade-linux-image-4-2-0-30-powerpc-e500mc
  • ubuntu-upgrade-linux-image-4-2-0-30-powerpc-smp
  • ubuntu-upgrade-linux-image-4-2-0-30-powerpc64-emb
  • ubuntu-upgrade-linux-image-4-2-0-30-powerpc64-smp

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;