{"id":"CVE-2026-64405","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()\n\nhci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection\nwas pending, but hdev->sent_cmd can b…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()\n\nhci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection\nwas pending, but hdev->sent_cmd can b…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.1.83, < 6.1.118","linux_kernel >= 6.4.16, < 6.5","linux_kernel >= 6.5.3, < 6.6.145","linux_kernel >= 6.7, < 6.12.97","linux_kernel >= 6.13, < 6.18.39","linux_kernel >= 6.19, < 7.1.4","linux_kernel = 7.2"],"patched":["linux_kernel 7.1.4"],"published":"2026-07-25","updated":"2026-09-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64405","references":[{"url":"https://git.kernel.org/stable/c/12917f591cea1af36087dba5b9ec888652f0b42a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/61701912c58a05f6a043f097cc177a964abef348","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/70c397b62ee015e19b3924d9da741c8dda017819","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/83b22d7f7c384564fa42c3cf19bec715c693d7a2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/903227b6168bb99fd57d4e3c9c1b5014986198e0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b42cb640a0493d16b61ddd267420274be15efdc1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00119,"epssPercentile":0.02016,"ingestedAt":"2026-09-05T14:40:37.423Z","slug":"CVE-2026-64405","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()\n\nhci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection\nwas pending, but hdev->sent_cmd can be NULL while req_status is still\nHCI_REQ_PEND, leading to a NULL pointer dereference and a general\nprotection fault from the hci_rx_work() receive path.\n\nInstead of inspecting hdev->sent_cmd, track the in-flight create\nconnection command with a new per-connection HCI_CONN_CREATE flag and\nroute all cancellation through hci_cancel_connect_sync(), which\ndispatches to a dedicated per-type cancel function. The create command\nis in exactly one of two states: still queued, or in flight. The cancel\nfunction holds cmd_sync_work_lock across the whole decision: the worker\ntakes this lock to dequeue every entry, so while it is held a queued\ncommand cannot start running and an in-flight command cannot complete\nand let the next command become pending. This keeps the flag test and\nhci_cmd_sync_cancel() atomic with respect to the worker, so a queued\ncommand is simply dequeued, and an in-flight command owned by this\nconnection is cancelled without the risk of cancelling an unrelated\ncommand that became pending in the meantime. CIS uses the same flag\nmechanism via HCI_CONN_CREATE_CIS but cannot be dequeued per-connection.\n\nhci_acl_create_conn_sync() and hci_le_create_conn_sync() clear\nHCI_CONN_CREATE after the create command completes, but the command\nstatus handler can free conn via hci_conn_del() (for example when the\ncontroller rejects the connection) while the worker is still blocked on\nthe connection complete event. Hold a reference on conn across the\ncreate command so the flag can be cleared without a use-after-free.\n\n## Affected\n\n- `linux_kernel >= 6.1.83, < 6.1.118`\n- `linux_kernel >= 6.4.16, < 6.5`\n- `linux_kernel >= 6.5.3, < 6.6.145`\n- `linux_kernel >= 6.7, < 6.12.97`\n- `linux_kernel >= 6.13, < 6.18.39`\n- `linux_kernel >= 6.19, < 7.1.4`\n- `linux_kernel = 7.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.1.4`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}