CVE-2026-46111 (GCVE-0-2026-46111)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-06-14 17:55
VLAI
Title
Bluetooth: hci_conn: fix potential UAF in create_big_sync
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in create_big_sync Add hci_conn_valid() check in create_big_sync() to detect stale connections before proceeding with BIG creation. Handle the resulting -ECANCELED in create_big_complete() and re-validate the connection under hci_dev_lock() before dereferencing, matching the pattern used by create_le_conn_complete() and create_pa_complete(). Keep the hci_conn object alive across the async boundary by taking a reference via hci_conn_get() when queueing create_big_sync(), and dropping it in the completion callback. The refcount and the lock are complementary: the refcount keeps the object allocated, while hci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on hdev->conn_hash, as required by hci_conn_del(). hci_conn_put() is called outside hci_dev_unlock() so the final put (which resolves to kfree() via bt_link_release) does not run under hdev->lock, though the release path would be safe either way. Without this, create_big_complete() would unconditionally dereference the conn pointer on error, causing a use-after-free via hci_connect_cfm() and hci_conn_del().
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 6823f730bf195fc296d9edd09e2ca94bc1ff5584 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 1750a2df0eab61dc421a7afae74abdd239a44b85 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < dc34f8d8240f25dd137dc2758ebbcc75e3779142 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < f8eaf92c57ad99358dd372580d5ff87623343a72 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 0beddb0c380bed5f5b8e61ddbe14635bb73d0b41 (git)
Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.90 , ≤ 6.12.* (semver)
Unaffected: 6.18.32 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Show details on NVD website

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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:40:55+00:00",
      "cve": "CVE-2026-46111",
      "id": "CVE-2026-46111",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_conn: fix potential UAF in create_big_sync",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46111.json",
      "version": "3"
    }
  }
}



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