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doc: update README with some info about variant3 and variant4
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@ -86,13 +86,13 @@ sudo ./spectre-meltdown-checker.sh
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**CVE-2018-3640** rogue system register read (Variant 3a)
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- Impact: TBC
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- Mitigation: TBC
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- Mitigation: microcode update only
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- Performance impact of the mitigation: negligible
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**CVE-2018-3639** speculative store bypass (Variant 4)
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- Impact: software using JIT (no known exploitation against kernel)
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- Mitigation: TBC
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- Mitigation: microcode update + kernel update making possible for affected software to protect itself
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- Performance impact of the mitigation: low to medium
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## Understanding what this script does and doesn't
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