CVE-2026-33840

{"id": "CVE-2026-33840", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2026-05-12T18:17:06.163", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33840", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally."}], "lastModified": "2026-06-01T19:16:25.380", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "048AD3CD-DD62-4B62-9302-61779D998B4A", "versionEndExcluding": "10.0.26100.8390"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "3682F4DD-0870-4E39-B75E-649C89BB1E08", "versionEndExcluding": "10.0.26100.8390"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "C2C93D38-DFD7-4DE1-95B8-6D73E4A545D6", "versionEndExcluding": "10.0.26200.8390"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "05EB89A0-2ADD-4B67-A644-41FE1DE69E4A", "versionEndExcluding": "10.0.26200.8390"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "D45A5D2F-E058-4033-B184-BAE224FC1CEA", "versionEndExcluding": "10.0.28000.2113"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "5127F350-9271-4B74-84E0-D7E5D2D5640E", "versionEndExcluding": "10.0.28000.2113"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9ABAB3B9-28AF-4278-8E78-E1191B1AFC0C", "versionEndExcluding": "10.0.26100.32772"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}