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Alerts This Week
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Ubuntu 16.04: USN-3633-1 Critical Denial Of Service Threat

ubuntu
Calendar Grey April 24, 2018
Scroller Ubuntu
An important flaw in Ubuntu 16.04 LTS has been identified, which could enable denial of service or unauthorized execution of programs with administrative rights.
The system could be made to crash or run programs as an administrator.

Summary

The system could be made to crash or run programs as an administrator.

Software Description:

- linux-euclid: Linux kernel for Intel Euclid systems

Details:

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation

in the Linux kernel improperly performed sign extension in some situations.

A local attacker could use this to cause a denial of service (system crash)

or possibly execute arbitrary code. (CVE-2017-16995)

Topics%20covered

Topics Covered

security advisory denial of service critical issue ubuntu linux kernel

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-9026-euclid   4.4.0-9026.28
  linux-image-euclid              4.4.0.9026.27

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-3633-1

CVE-2017-16995

Severity
critical
Lowest
Low
Medium
High
Critical

April 24, 2018

Topics%20covered

Topics Covered

security advisory denial of service critical issue ubuntu linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-euclid/4.4.0-9026.28

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