CVE-2025-20805

// CVE-2025-20805 PoC - MediaTek DPE Use After Free // This is a conceptual proof of concept demonstrating the vulnerability pattern // Requires system-level privileges to exploit #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated DPE object structure struct DPEObject { void* vtable; char* buffer; size_t size; int flags; }; // Vulnerable function pattern - accessing freed memory void trigger_use_after_free(struct DPEObject* obj) { // This simulates the vulnerable code path in DPE // After obj is freed, accessing obj->buffer leads to UAF if (obj != NULL && obj->buffer != NULL) { printf("Accessing buffer at %p\n", obj->buffer); // Potential arbitrary read/write here } } // Function to trigger the vulnerability int trigger_vulnerability() { struct DPEObject* obj = (struct DPEObject*)malloc(sizeof(struct DPEObject)); if (obj == NULL) return -1; // Initialize object obj->buffer = (char*)malloc(256); obj->size = 256; // Trigger normal operation trigger_use_after_free(obj); // Free the object (simulating the vulnerable condition) free(obj->buffer); free(obj); // UAF condition: obj pointer still exists, buffer was freed // In real exploit, attacker would spray heap and trigger reallocation trigger_use_after_free(obj); // Use after free! return 0; } int main() { printf("CVE-2025-20805 PoC - MediaTek DPE Use After Free\n"); printf("Requires system privileges to exploit\n"); trigger_vulnerability(); return 0; } /* Actual exploitation steps: 1. Obtain system-level privileges 2. Identify DPE driver interface through /dev/ or sysfs 3. Spray heap with controlled data using ioctl calls 4. Trigger object allocation in DPE 5. Free the object through specific ioctl 6. Reallocate freed memory with attacker-controlled data 7. Trigger use-after-free condition 8. Achieve privilege escalation to root */

{"cve": {"id": "CVE-2025-20805", "sourceIdentifier": "[email protected]", "published": "2026-01-06T02:15:44.717", "lastModified": "2026-01-08T19:22:41.417", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In dpe, there is a possible memory corruption due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10114696; Issue ID: MSV-4480."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 6.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:-:*:*:*:*:*:*", "matchCriteriaId": "02882AB1-7993-47DD-84A0-8DF4272D85ED"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6899:-:*:*:*:*:*:*:*", "matchCriteriaId": "C6E9F80F-9AC9-41E0-BB14-9DB6F14B62CD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*", "matchCriteriaId": "CBBB30DF-E963-4940-B742-F6801F68C3FC"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8793:-:*:*:*:*:*:*:*", "matchCriteriaId": "2FBD3487-F8CE-406C-8BD7-DD57FF8CD60B"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/January-2026", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}