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CVE-2021-26401 is an insufficient speculative-execution mitigation affecting the AMD LFENCE/JMP sequence (MITIGATION V2-2) intended to mitigate Spectre Variant 2 (CVE-2017-5715). On AMD Zen, Zen+, Zen 2, and Zen 3 processors, an incorrectly predicted indirect branch can retain a speculative-execution window large enough to permit exploitation despite the LFENCE/JMP sequence. The condition was observed when a specific workload executes on a simultaneous multithreading sibling thread.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
CPU mitigation update related to CVE-2017-5715.
CPU LFENCE/JMP mitigation update associated with CVE-2017-5715.
Hardware/CPU mitigation update associated with CVE-2017-5715.
Hardware/CPU LFENCE/JMP mitigation update associated with CVE-2017-5715.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.