CVE-2026-20815

// CVE-2026-20815 PoC - Race Condition in camsvc // This PoC demonstrates the concept of exploiting a race condition // Requires: Local access with low privilege account #include <windows.h> #include <stdio.h> #include <threads.h> #define MAX_ATTEMPTS 10000 // Simulated vulnerable function BOOL VulnerableOperation() { // Simulating shared resource access without proper locking static BOOL resource_in_use = FALSE; if (resource_in_use) { // Race window - attacker can exploit here return FALSE; } resource_in_use = TRUE; // Small delay creates race condition window Sleep(1); // Attacker can manipulate state during this window resource_in_use = FALSE; return TRUE; } int RaceConditionThread(void* arg) { for (int i = 0; i < MAX_ATTEMPTS; i++) { if (VulnerableOperation()) { // Success - privilege escalation possible printf("Race condition won at attempt %d\n", i); return 1; } } return 0; } int main() { printf("CVE-2026-20815 camsvc Race Condition PoC\n"); printf("Target: Windows camsvc Service\n"); printf("Attempting race condition exploitation...\n"); // Create multiple threads to increase race condition probability thrd_t t1, t2, t3; thrd_create(&t1, RaceConditionThread, NULL); thrd_create(&t2, RaceConditionThread, NULL); thrd_create(&t3, RaceConditionThread, NULL); thrd_join(t1, &(int){0}); thrd_join(t2, &(int){0}); thrd_join(t3, &(int){0}); printf("PoC execution complete\n"); printf("Note: This is a conceptual PoC. Actual exploitation requires specific camsvc interaction.\n"); return 0; }

{"cve": {"id": "CVE-2026-20815", "sourceIdentifier": "[email protected]", "published": "2026-01-13T18:16:08.273", "lastModified": "2026-01-14T20:27:14.820", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally."}, {"lang": "es", "value": "Ejecución concurrente utilizando un recurso compartido con sincronización inadecuada ('condición de carrera') en el Servicio de Gestión de Acceso a Capacidades (camsvc) permite a un atacante autorizado elevar privilegios localmente."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.7623", "matchCriteriaId": "D249551B-1433-4E5E-A587-40F782E91E09"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26200.7623", "matchCriteriaId": "22082D4E-E68F-4E48-98FB-42DFDEE2E2A8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.32230", "matchCriteriaId": "D44880ED-E8E9-49A8-BD56-503C63D40000"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20815", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}