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CVE-2024-35347 is a vulnerability in AMD CPUs, specifically affecting the microcode signature verification process. The flaw allows systems to accept microcode updates that lack the critical microcode signing fix, leaving them exposed to potential exploitation. The vulnerability primarily impacts AMD Family 19h CPUs and is documented in AMD security bulletin AMD-SB-7033. The root cause is insufficient enforcement of microcode signature verification, which can only be fully remediated by applying a BIOS update that delivers the updated microcode with the signing fix. Without this update, systems remain vulnerable even if they receive microcode updates from the Linux firmware repository, as these do not address the underlying signature verification issue.
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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.
3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.