I'm running my new (2 days old) relay using:

  • my own dedicated server Dell T20 with hardware:

    • CPU: Intel Xeon E3-1225 v3 @ 3.20GHz (Haswell)

    • RAM: 32 GB DDR3 ECC

    • NET: overall maximum bandwidth of 30 Mbit down / 30 Mbit up

  • UEFI / BIOS patch version A19 (latest)

  • Debian version 10 Buster (testing)

  • kernel version 4.19.0-2 (latest)

  • intel-microcode package installed

  • Tor version (recommended)

  • I monitor the relay with Nyx all day long


Nowadays, with all kinds of Spectre vulnerabilities and similar threats, I would like to know if my hardware and the operating system is safe from these and if I can do anything else than regularly check for all updates?

1 Answer 1


Spectre check script available

I have found one very good and maintained shell script to check for these vulnerabilities. It's hosted on GitHub:


So, today (2019-Mar-08), there is a release v0.40 available, but the link above will always take you to the latest release.

How to use it

It's as simple as downloading the Source code (tar.gz), extracting it, and running the script with root privileges like so:

sudo ./spectre-meltdown-checker.sh

Note, that you might get more information than you need or want. If you want quick and short info, run:

sudo ./spectre-meltdown-checker.sh --batch text

Example output

Taken from the short version on my server above:

CVE-2017-5753: OK (Mitigation: __user pointer sanitization)
CVE-2017-5715: OK (Full retpoline + IBPB are mitigating the vulnerability)
CVE-2017-5754: OK (Mitigation: PTI)
CVE-2018-3640: OK (your CPU microcode mitigates the vulnerability)
CVE-2018-3639: OK (Mitigation: Speculative Store Bypass disabled via prctl and seccomp)
CVE-2018-3615: OK (your CPU vendor reported your CPU model as not vulnerable)
CVE-2018-3620: OK (Mitigation: PTE Inversion)
CVE-2018-3646: OK (this system is not running an hypervisor)

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