Skip to content
Heist/ feed
High

Bluetooth: hci_conn: fix potential UAF in create_big_sync

Type: advisorySource: Official CVE List1 source record

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().

Announced Source revision 1
Original source ↗

CVE-2026-46111

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46111

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "eca0ae4aea66914515e5e3098ea051b518ee5316",
        "lessThan": "d41093723e47255d7d74df86e2736711c1b8486e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eca0ae4aea66914515e5e3098ea051b518ee5316",
        "lessThan": "6823f730bf195fc296d9edd09e2ca94bc1ff5584",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eca0ae4aea66914515e5e3098ea051b518ee5316",
        "lessThan": "1750a2df0eab61dc421a7afae74abdd239a44b85",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eca0ae4aea66914515e5e3098ea051b518ee5316",
        "lessThan": "dc34f8d8240f25dd137dc2758ebbcc75e3779142",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eca0ae4aea66914515e5e3098ea051b518ee5316",
        "lessThan": "f8eaf92c57ad99358dd372580d5ff87623343a72",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eca0ae4aea66914515e5e3098ea051b518ee5316",
        "lessThan": "0beddb0c380bed5f5b8e61ddbe14635bb73d0b41",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_conn.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.90",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.32",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_conn.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46111

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40119 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement