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

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-08-19 16:28
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().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < d41093723e47255d7d74df86e2736711c1b8486e (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 6823f730bf195fc296d9edd09e2ca94bc1ff5584 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 1750a2df0eab61dc421a7afae74abdd239a44b85 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < dc34f8d8240f25dd137dc2758ebbcc75e3779142 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < f8eaf92c57ad99358dd372580d5ff87623343a72 (git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 0beddb0c380bed5f5b8e61ddbe14635bb73d0b41 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (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)
guessed Create a notification for this product.
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              "value": "AV:L - The UAF is reached only through a local ISO socket connect() syscall (BTPROTO_ISO \u2192 iso_connect_bis \u2192 hci_connect_bis); BIG broadcast setup is locally initiated and requires no Bluetooth peer or over-the-air frame, so the attacker needs local system access.\nAC:L - This is a use-after-free where the attacker controls both sides of the race \u2014 initiating the async create_big work via connect() and freeing the conn (e.g., closing the socket) \u2014 and can retry at will, so the condition is within attacker control.\nPR:L - Creating and connecting an ISO socket requires no capability check (iso_sock_create/bt_sock_create perform none), so any unprivileged local user can reach the path on systems where the ISO/BIS feature is enabled.\nUI:N - The attacker performs all steps (open socket, connect, race a teardown); no victim interaction is required.\nS:U - The use-after-free is contained within the kernel\u0027s own memory/security authority and does not cross into another security boundary such as a VM or IOMMU domain.\nC:H - A UAF of the hci_conn object gives the attacker control over the freed object\u0027s contents, enabling kernel-memory disclosure (e.g., leaking pointers/data placed in the reclaimed allocation).\nI:H - The freed hci_conn is dereferenced and written via hci_connect_cfm() and hci_conn_del() (including list_del_rcu on conn_hash), so heap grooming of the freed slab yields an arbitrary-write/control-flow primitive.\nA:H - Dereferencing and deleting a freed hci_conn reliably causes memory corruption leading to a kernel oops/panic."
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    "datePublished": "2026-05-28T09:35:19.970Z",
    "dateReserved": "2026-05-13T15:03:33.098Z",
    "dateUpdated": "2026-08-19T16:28:01.615Z",
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    "redhat_vex": {
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      "current_release_date": "2026-08-05T14:46:18+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",
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      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T16:56:23Z",
      "cve": "CVE-2026-46111",
      "id": "CVE-2026-46111",
      "initial_release_date": "2026-05-29T01:17:03Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "482",
      "product_status:known_not_affected": "221",
      "product_status:recommended": "283",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46111",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46111.json",
      "version": "18"
    }
  }
}



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Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.