Tools for checking Spectre and Meltdown system vulnerabilities on Linux?

Question

I seek some reliable ways / tools for checking Spectre and Meltdown system vulnerabilities on Linux?

That are currently the following CVEs:

• CVE-2017-5753 [bounds check bypass] aka Spectre Variant 1

• CVE-2017-5715 [branch target injection] aka Spectre Variant 2

• CVE-2017-5754 [rogue data cache load] aka Meltdown aka Variant 3

• CVE-2018-3640 [rogue system register read] aka Variant 3a

• CVE-2018-3639 [speculative store bypass] aka Variant 4

Answer 1

I have found one good and maintained script on GitHub (link).

Usage is as simple as running the script with superuser privileges, e.g.:

sudo ./spectre-meltdown-checker.sh

Possible result with proper patches in place: