‘CacheOut’ Attack: update microcode without a reboot and you're safe

Published: Feb 11, 2020 5:31:11 PM / Last update: Jun 10, 2020 / by Alexandra Mitroshkina


At the end of January 2020, another speculative execution vulnerability was found in Intel processors. Any modern Intel CPU built before October 2018 is likely vulnerable to a discovered hardware issue that could allow attackers to leak sensitive data from the OS kernel, co-resident virtual machines, and even from Intel's secured SGX enclave.

Dubbed CacheOut a.k.a. L1 Data Eviction Sampling (L1DES) and assigned CVE-2020-0549, the new microarchitectural attack allows an attacker to choose which data to leak from the CPU's L1 Cache, unlike previously demonstrated MDS attacks where attackers need to wait for the targeted data to be available. The flaw can't be exploited remotely from a web browser and also doesn't affect AMD processors.


More than a year ago, KernelCare has released the patches for a similar class of vulnerability - L1 Terminal Fault (L1TF). It turned out that the KernelCare patch against L1 Terminal Fault (L1TF) covers the L1 Data Eviction Sampling (L1DES) vulnerability. 


If you are a KernelCare user - all that is left for you to do in order to protect your infrastructure is to update microcode without a reboot using KernelCare instructions.


If you are not yet using KernelCare - sign up for a free trial to get the patches for Linux kernels and devices automatically, without a reboot.


Try KernelCare for FREE


Read more about live patching of critical CVEs without a reboot here:

About KernelCare

KernelCare is a live patching system that patches Linux kernel vulnerabilities automatically, with no reboots. It's used on over 300,000 servers, and has been used to patch servers running for 6+ years. It works with all major Linux distributions, such as RHEL, CentOS, Amazon Linux, and Ubuntu. It also interoperates with common vulnerability scanners such as Nessus, Tenable, Rapid7, and Qualys. To talk with a consultant about how KernelCare might meet your enterprise’s specific needs, contact us directly at sales@kernelcare.com.

Topics: KernelCare Blog, Cache Out Vulnerability

Alexandra Mitroshkina

Written by Alexandra Mitroshkina

Product Marketing Manager of KernelCare with 8 years experience in Advertising, Marketing and Project management for IT, mHealth and FinTech areas

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