CVE-2026-53256 (GCVE-0-2026-53256)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:41
VLAI
Title
Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind() rfcomm_get_sock_by_channel() scans rfcomm_sk_list under the list lock, but returns the selected listener after dropping that lock without taking a reference. rfcomm_connect_ind() then locks the listener, queues a child socket on it, and may notify it after unlocking it. The buggy scenario involves two paths, with each column showing the order within that path: rfcomm_connect_ind(): listener close: 1. Find parent in 1. close() enters rfcomm_get_sock_by_channel() rfcomm_sock_release(). 2. Drop rfcomm_sk_list.lock 2. rfcomm_sock_shutdown() without pinning parent. closes the listener. 3. Call lock_sock(parent) and 3. rfcomm_sock_kill() bt_accept_enqueue(parent, unlinks and puts parent. sk, true). 4. Read parent flags and may 4. parent can be freed. call sk_state_change(). If close wins the race, parent can be freed before rfcomm_connect_ind() reaches lock_sock(), bt_accept_enqueue(), or the deferred-setup callback. Take a reference on the listener before leaving rfcomm_sk_list.lock. After lock_sock() succeeds, recheck that it is still in BT_LISTEN before queueing a child, cache the deferred-setup bit while the parent is locked, and drop the reference after the last parent use. KASAN reported a slab-use-after-free in lock_sock_nested() from rfcomm_connect_ind(), with the freeing stack going through rfcomm_sock_kill() and rfcomm_sock_release().
Severity
8 (High)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f5ec76bdbeb80f75ad0be204371afffee0f8fac8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a07d741c077d4e34b16458241a94d29039386553 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1f73f92f66251065a5f39b09a47cf05ea14d3107 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < de31973ef00e5aa55496f84cf6a44bb157a34e02 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b0e33e409715c617e2a20f46f99aa5403a14dfda (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8802413ce63175fb522a2bd609fb043a3550c720 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6f4462d12133106460d7c046b95aad2491e3fddf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 43c441edacf953b39517a44f5e5e10a93618b226 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()\n\nrfcomm_get_sock_by_channel() scans rfcomm_sk_list under the list lock,\nbut returns the selected listener after dropping that lock without\ntaking a reference. rfcomm_connect_ind() then locks the listener,\nqueues a child socket on it, and may notify it after unlocking it.\n\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\n\nrfcomm_connect_ind():            listener close:\n  1. Find parent in              1. close() enters\n     rfcomm_get_sock_by_channel()   rfcomm_sock_release().\n  2. Drop rfcomm_sk_list.lock    2. rfcomm_sock_shutdown()\n     without pinning parent.        closes the listener.\n  3. Call lock_sock(parent) and  3. rfcomm_sock_kill()\n     bt_accept_enqueue(parent,      unlinks and puts parent.\n     sk, true).\n  4. Read parent flags and may   4. parent can be freed.\n     call sk_state_change().\n\nIf close wins the race, parent can be freed before\nrfcomm_connect_ind() reaches lock_sock(), bt_accept_enqueue(), or the\ndeferred-setup callback.\n\nTake a reference on the listener before leaving rfcomm_sk_list.lock.\nAfter lock_sock() succeeds, recheck that it is still in BT_LISTEN\nbefore queueing a child, cache the deferred-setup bit while the parent\nis locked, and drop the reference after the last parent use.\n\nKASAN reported a slab-use-after-free in lock_sock_nested() from\nrfcomm_connect_ind(), with the freeing stack going through\nrfcomm_sock_kill() and rfcomm_sock_release()."
        }
      ],
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            "baseScore": 8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
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      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:41:00.818Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/a07d741c077d4e34b16458241a94d29039386553"
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        },
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          "url": "https://git.kernel.org/stable/c/6f4462d12133106460d7c046b95aad2491e3fddf"
        },
        {
          "url": "https://git.kernel.org/stable/c/43c441edacf953b39517a44f5e5e10a93618b226"
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      ],
      "title": "Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()",
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        "engine": "bippy-1.2.0"
      }
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    "datePublished": "2026-06-25T08:39:46.591Z",
    "dateReserved": "2026-06-09T07:44:35.394Z",
    "dateUpdated": "2026-06-28T06:41:00.818Z",
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Drop rfcomm_sk_list.lock    2. rfcomm_sock_shutdown()\\n     without pinning parent.        closes the listener.\\n  3. Call lock_sock(parent) and  3. rfcomm_sock_kill()\\n     bt_accept_enqueue(parent,      unlinks and puts parent.\\n     sk, true).\\n  4. Read parent flags and may   4. parent can be freed.\\n     call sk_state_change().\\n\\nIf close wins the race, parent can be freed before\\nrfcomm_connect_ind() reaches lock_sock(), bt_accept_enqueue(), or the\\ndeferred-setup callback.\\n\\nTake a reference on the listener before leaving rfcomm_sk_list.lock.\\nAfter lock_sock() succeeds, recheck that it is still in BT_LISTEN\\nbefore queueing a child, cache the deferred-setup bit while the parent\\nis locked, and drop the reference after the last parent use.\\n\\nKASAN reported a slab-use-after-free in lock_sock_nested() from\\nrfcomm_connect_ind(), with the freeing stack going through\\nrfcomm_sock_kill() and 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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