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CVE-2025-54505 is a transient execution side-channel vulnerability affecting certain AMD CPUs, including Zen 1 and Zen+ based processors. The issue is described as Floating Point Divider State Sampling (FPDSS). The hardware floating-point divider may retain partial quotient data from prior operations, creating a stale-data disclosure condition that can be sampled by a local, user-privileged attacker through transient execution techniques. In virtualized environments, this can cross security boundaries by allowing one guest context to infer data associated with another guest or execution context on the same physical processor. The primary security consequence is loss of confidentiality rather than direct integrity or availability impact.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Citrix-addressed vulnerability listed in the July 1, 2026 security updates affecting Citrix products; specific technical details are not provided in the content.
A hardware-side issue, Floating Point Divider State Sampling, affecting certain AMD CPUs that could allow one guest VM to infer data from another VM.
A hardware information-leak issue on certain AMD CPUs, mitigated in Xen environments to prevent one guest VM from inferring data from another VM.
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.