CVE-2026-27924

/* * PoC for CVE-2026-27924 (Conceptual) * Triggering Use After Free in Desktop Window Manager * Note: This is a simplified simulation for demonstration purposes. */ #include <windows.h> #include <iostream> void SimulateUAF() { HANDLE hHeap = GetProcessHeap(); // Allocate memory for the vulnerable object PVOID vulnerableObject = HeapAlloc(hHeap, HEAP_ZERO_MEMORY, 0x100); std::cout << "[+] Object allocated at: " << vulnerableObject << std::endl; // Step 1: Trigger the free (Vulnerability Trigger) // In the real vulnerability, specific DWM messages cause this. HeapFree(hHeap, 0, vulnerableObject); std::cout << "[+] Object freed." << std::endl; // Step 2: Allocate controlled memory to occupy the freed space // (Heap Grooming/Spraying) PVOID controlledObject = HeapAlloc(hHeap, HEAP_ZERO_MEMORY, 0x100); memset(controlledObject, 0x41, 0x100); // Fill with 'A's (0x41) std::cout << "[+] Controlled memory allocated at: " << controlledObject << std::endl; // Step 3: Use After Free // The system attempts to use the freed pointer, now controlled by attacker. if (vulnerableObject == controlledObject) { std::cout << "[!] Successfully replaced freed memory. UAF condition triggered." << std::endl; // Malicious code execution would occur here in a real exploit. } HeapFree(hHeap, 0, controlledObject); } int main() { std::cout << "[*] Starting PoC for CVE-2026-27924..." << std::endl; SimulateUAF(); return 0; }

{"cve": {"id": "CVE-2026-27924", "sourceIdentifier": "[email protected]", "published": "2026-04-14T18:17:03.020", "lastModified": "2026-04-22T17:40:36.760", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.19044.7184", "matchCriteriaId": "88A175C4-E033-4FE7-B2BF-8BAE14321BC4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.19044.7184", "matchCriteriaId": "86DBF14A-F486-4FE7-9126-D1D54952FC6C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.19044.7184", "matchCriteriaId": "C375372B-D3D4-4B11-AAD8-69AC344C24BC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.19045.7184", "matchCriteriaId": "8CE2E268-E776-4697-9E43-33ABA4CDBE05"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.19045.7184", "matchCriteriaId": "269B8E88-6473-41DD-BA33-D9184B82CA58"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.19045.7184", "matchCriteriaId": "FCBB431B-EF21-4454-BDA3-D8F276BE7A64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.22631.6936", "matchCriteriaId": "B33CE091-B873-4C30-BA05-54A8C1839212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.22631.6936", "matchCriteriaId": "E3AF28F3-D486-4B88-9E0E-371241024174"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.20348.5020", "matchCriteriaId": "DC6837B7-5DFD-4AF7-B436-3C6FEF48BA60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.25398.2274", "matchCriteriaId": "55A1F3AB-5299-4495-9A73-FDA23C6FD88D"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27924", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}