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spectre-meltdown-checker — Spectre and Meltdown mitigation detection tool. More information: <https://manned.org/spectre-meltdo

Submitted by: @import:tldr-pages·Mar 2, 2026·

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spectre-meltdown-checkerspectrecommandandclidetectionmeltdownmitigation

linux

Problem

How to use the spectre-meltdown-checker command: Spectre and Meltdown mitigation detection tool. More information: <https://manned.org/spectre-meltdown-checker>.

Solution

spectre-meltdown-checker — Spectre and Meltdown mitigation detection tool. More information: <https://manned.org/spectre-meltdown-checker>.

Check the currently running kernel for Spectre or Meltdown:

sudo spectre-meltdown-checker

Check the currently running kernel and show an explanation of the actions to take to mitigate a vulnerability:

sudo spectre-meltdown-checker --explain

Check for specific variants (defaults to all):

sudo spectre-meltdown-checker --variant {{1|2|3|3a|4|l1tf|msbds|mfbds|mlpds|mdsum|taa|mcespc|srbds}}

Display output using a specific output format:

sudo spectre-meltdown-checker --batch {{text|json|nrpe|prometheus|short}}

Don't use the /sys interface even if present:

sudo spectre-meltdown-checker --no-sysfs

Check a non-running kernel:

sudo spectre-meltdown-checker --kernel {{path/to/kernel_file}}

Code Snippets

Check the currently running kernel for Spectre or Meltdown

sudo spectre-meltdown-checker

Check the currently running kernel and show an explanation of the actions to take to mitigate a vulnerability

sudo spectre-meltdown-checker --explain

Check for specific variants (defaults to all)

sudo spectre-meltdown-checker --variant {{1|2|3|3a|4|l1tf|msbds|mfbds|mlpds|mdsum|taa|mcespc|srbds}}

Display output using a specific output format

sudo spectre-meltdown-checker --batch {{text|json|nrpe|prometheus|short}}

Don't use the `/sys` interface even if present

sudo spectre-meltdown-checker --no-sysfs

Context

tldr-pages: linux/spectre-meltdown-checker

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