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TCP SACK PANIC: Linux Kernel Vulnerability

2.7.2019 by UKFast

Three related flaws have been found in the Linux kernel’s handling of TCP networking.  Let’s take a look at what this means and what you can do about it. What is the vulnerability? The flaws were found in the Linux kernel’s handling of TCP Selective Acknowledgement (SACK) packets, handling with low Maximum Segment Size (MSS). The issues have been assigned multiple CVEs: CVE-2019-11477 is considered an Important severity, whereas CVE-2019-11478 and CVE-2019-11479 are considered a Moderate severity. The most severe vulnerability could allow a remote attacker to trigger a SACK PANIC in systems running the affected software. This causes a huge drop in network efficiency and, as a result, impacts…

Women in STEM: What’s changed in 2018?

6.9.2018 by Jenn Granger

It’s been a great day for the world of science and tech today, as we found out about a huge step forward for women wanting to pursue a career in STEM! Leading astronomer Professor Dame Jocelyn Bell Burnell has been…

Linux Training Hits the Next Level!

2.7.2018 by Jenn Granger

At UKFast, we’re very excited to announce our very special partnership with the LPI has just stepped up its game. As a Gold Approved Training Provider of the LPI (Linux Professional Institute), we have just been selected as one of…

Learning Linux

2.5.2017 by Alice Cullen

It is reported that Benjamin Franklin once said: “Tell me and I forget. Teach me and I remember. Involve me and I learn.” It’s a quote that we hold quite close here at UKFast. We’re always trying to help our…

It Behooves You to Patch This Linux Vulnerability

28.10.2016 by Jenn Granger

It’s well-known that the tech community is a big fan of weird and wonderful nicknames for their vulnerabilities, but while the name of the new one – ‘Dirty COW’ –  is particularly special, don’t let the tongue-in-cheek name fool you;…

Become a Linux Legend

11.10.2016 by Jenn Granger

If you enjoy both a good workshop and the hit operating system Linux – and let’s face it, who doesn’t? – then we’ve got a special treat in store for you! As we continue our crusade to bridge the digital skills…

Fast Fridays – 7th October 2016

7.10.2016 by Jenn Granger

Happy Friday humans, you’ve made it through another week and are mere hours away from the sweet taste of the weekend (which tastes like sleep and fun in case you were wondering). In this week’s blog we’ve been talking about…

Top of the Classroom

27.7.2016 by Guest

At UKFast we are always looking for new ways to get creative in the classroom and find new ways to tackle that pesky digital skills gap we always read so much about! Well, this time we’ve decided to take our…

A New Update you Need to be A(VM)ware Of

23.2.2016 by Jenn Granger

Last week a vulnerability in the glibc was causing a ruckus, and we waited on tenterhooks for an update from VMware. Here’s the latest information on the situation, and on how we’re protecting our customers! Last week Google and Redhat…

The Linux Bug Getting Everyone’s Knickers in a Twist

17.2.2016 by Jenn Granger

Here to spice up your Wednesday is a new 'mega bug' in Linux. The vulnerability potentially affects hundreds of thousands of Linux users and has the internet all of a bother. While it’s still in the early stages and it…