EUVD-2026-56612
GHSA-5xgh-p4xm-3hc9
Severity by source
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Local access and low privilege required; high complexity for side-channel timing; scope change reflects cross-boundary read; no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
No cwe for this issue in AMD Zen allows an authorized attacker to disclose information locally.
AnalysisAI
Information disclosure in AMD Zen processor microarchitecture, surfaced through Windows system software, enables a local low-privileged attacker to read high-sensitivity data across security boundaries. The CVSS Scope Changed metric (S:C) combined with C:H and the AMD Zen tag strongly suggests a microarchitectural side-channel capable of leaking data from outside the attacker's security context - a pattern consistent with speculative execution or cache-based cross-boundary leakage. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires physical or remote shell access as a low-privileged local user account (PR:L) on a Windows system running on AMD Zen processor hardware - the AMD Zen microarchitecture is a hard prerequisite and this vulnerability does not apply to non-AMD or non-Zen systems. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS score of 5.6 (Medium) reflects a balanced but non-trivial risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released security updates from Microsoft for the affected Windows version in your environment. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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