CVE-2026-64405Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn() hci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection was pending, but hdev->sent_cmd can be NULL while req_status is still HCI_REQ_PEND, leading to a NULL pointer dereference and a general protection fault from the hci_rx_work() receive path. Instead of inspecting hdev->sent_cmd, track the in-flight create connection command with a new per-connection HCI_CONN_CREATE flag and route all cancellation through hci_cancel_connect_sync(), which dispatches to a dedicated per-type cancel function. The create command is in exactly one of two states: still queued, or in flight. The cancel function holds cmd_sync_work_lock across the whole decision: the worker takes this lock to dequeue every entry, so while it is held a queued command cannot start running and an in-flight command cannot complete and let the next command become pending. This keeps the flag test and hci_cmd_sync_cancel() atomic with respect to the worker, so a queued command is simply dequeued, and an in-flight command owned by this connection is cancelled without the risk of cancelling an unrelated command that became pending in the meantime. CIS uses the same flag mechanism via HCI_CONN_CREATE_CIS but cannot be dequeued per-connection. hci_acl_create_conn_sync() and hci_le_create_conn_sync() clear HCI_CONN_CREATE after the create command completes, but the command status handler can free conn via hci_conn_del() (for example when the controller rejects the connection) while the worker is still blocked on the connection complete event. Hold a reference on conn across the create command so the flag can be cleared without a use-after-free.

Timeline

Scores

EPSS (exploitation in 30 days)

0.12% · top 98% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

• Linux · Linux

  • affected 6083089ab00631617f9eac678df3ab050a9d837a – < 903227b6168bb99fd57d4e3c9c1b5014986198e0
  • affected a13f316e90fdb1fb6df6582e845aa9b3270f3581 – < 83b22d7f7c384564fa42c3cf19bec715c693d7a2
  • affected a13f316e90fdb1fb6df6582e845aa9b3270f3581 – < 70c397b62ee015e19b3924d9da741c8dda017819
  • affected a13f316e90fdb1fb6df6582e845aa9b3270f3581 – < 61701912c58a05f6a043f097cc177a964abef348
  • affected a13f316e90fdb1fb6df6582e845aa9b3270f3581 – < b42cb640a0493d16b61ddd267420274be15efdc1
  • affected a13f316e90fdb1fb6df6582e845aa9b3270f3581 – < 12917f591cea1af36087dba5b9ec888652f0b42a
  • affected e4511a67fcdba9729d1c7cfc6d2e645c765ce801
  • affected 4ab81f16c68a602b2b69e333ae08d8748a9398de
  • affected 6.1.83 – < 6.1.118
  • affected 6.4.16 – < 6.5
  • affected 6.5.3 – < 6.6

• Linux · Linux

  • affected 6.6
  • unaffected < 6.6
  • unaffected 6.1.118 – ≤ 6.1.*
  • unaffected 6.6.145 – ≤ 6.6.*
  • unaffected 6.12.97 – ≤ 6.12.*
  • unaffected 6.18.39 – ≤ 6.18.*
  • unaffected 7.1.4 – ≤ 7.1.*
  • unaffected 7.2 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-48949 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-64405](https://cveledger.app/badge/CVE-2026-64405.svg)](https://cveledger.app/cve/CVE-2026-64405)

Record last updated 6 Nov 2026, 16:44 UTC.