Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 542
Alerts This Week
Warning Icon 1 542

Ubuntu 14.04 LTS USN-2890-2 Critical: Linux Kernel Denial of Service

ubuntu
Calendar Grey February 2, 2016
Scroller Ubuntu
A variety of security patches were deployed for the Linux kernel in Ubuntu 14.04 LTS, targeting key vulnerabilities and potential exploits.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-wily: Linux hardware enablement kernel from Wily

Details:

It was discovered that a use-after-free vulnerability existed in the

AF_UNIX implementation in the Linux kernel. A local attacker could use

crafted epoll_ctl calls to cause a denial of service (system crash) or

expose sensitive information. (CVE-2013-7446)

It was discovered that the KVM implementation in the Linux kernel did not

properly restore the values of the Programmable Interrupt Timer (PIT). A

user-assisted attacker in a KVM guest could cause a denial of service in

the host (system crash). (CVE-2015-7513)

It was discovered that the Linux kernel keyring subsystem contained a race

between read and revoke operations. A local attacker could use this to

cause a denial of service (system crash). (CVE-2015-7550)

Sasha Levin discovered that the Reliable Datagram Sockets (RDS)

implementation in the Linux kernel had ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical issue system crash linux-lts-wily

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.2.0-27-generic    4.2.0-27.32~14.04.1
  linux-image-4.2.0-27-generic-lpae  4.2.0-27.32~14.04.1
  linux-image-4.2.0-27-lowlatency  4.2.0-27.32~14.04.1
  linux-image-4.2.0-27-powerpc-e500mc  4.2.0-27.32~14.04.1
  linux-image-4.2.0-27-powerpc-smp  4.2.0-27.32~14.04.1
  linux-image-4.2.0-27-powerpc64-emb  4.2.0-27.32~14.04.1
  linux-image-4.2.0-27-powerpc64-smp  4.2.0-27.32~14.04.1

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

https://ubuntu.com/security/notices/USN-2890-2

https://ubuntu.com/security/notices/USN-2890-1

CVE-2013-7446, CVE-2015-7513, CVE-2015-7550, CVE-2015-7990,

CVE-2015-8374, CVE-2015-8543, CVE-2015-8569, CVE-2015-8575,

CVE-2015-8787

Severity
critical
Lowest
Low
Medium
High
Critical

February 02, 2016

Topics%20covered

Topics Covered

security advisory denial of service critical issue system crash linux-lts-wily

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-wily/4.2.0-27.32~14.04.1

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.