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              "value": "AV:L - The vulnerable path is reachable through local AF_QIPCRTR datagram sockets via bind/autobind, sendmsg lookup, rebind, and close/release; QRTR transports are local IPC/internal device transports rather than Internet-facing network services. A local unprivileged process on a QRTR-enabled system can create and race these sockets.\nAC:L - Although this is a race, the attacker can control both sides by repeatedly removing bound QRTR ports while concurrently causing QRTR port lookups through local sends or other QRTR activity. Syzkaller reached the race, and there are no special external conditions beyond attacker-driven concurrency.\nPR:L - Creating AF_QIPCRTR sockets and binding ephemeral or high-numbered QRTR ports does not require CAP_NET_ADMIN or root. Control-port binding has extra checks, but exploitation does not depend on becoming the controller.\nUI:N - No victim action is required once the attacker has local code execution. The attacker can create sockets, bind/send/close them, and run the race directly.\nS:U - The corruption is within the kernel networking/QRTR subsystem and does not cross a separate security authority such as a VM, IOMMU, or sandbox boundary. A local kernel compromise remains unchanged scope.\nC:H - The bug is a potential use-after-free of a QRTR socket object reachable through stale XArray/RCU lookups and refcount resurrection. Per kernel scoring guidance, UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - A UAF on a kernel socket object can potentially be shaped with heap spraying into write or control-flow primitives. When uncertain, this should be scored as high integrity impact rather than only a crash.\nA:H - The observed failure is a refcount saturation warning on a stale socket reference, and the underlying UAF can lead to kernel oops, panic, or memory corruption. This is high availability impact."
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/rfcomm/sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
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            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.12.94",
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                },
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                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                },
                {
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              "negate": false,
              "operator": "OR"
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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()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerable path is reached by Bluetooth RFCOMM/L2CAP traffic from a nearby peer, so the attacker must be within Bluetooth radio range rather than merely local or internet-routable.\nAC:L - The race is between an inbound RFCOMM connect indication and listener close; an attacker with an unprivileged local RFCOMM listener plus a controlled adjacent Bluetooth peer can drive both sides repeatedly.\nPR:L - Creating, binding, listening on, and closing an RFCOMM stream socket has no CAP_NET_ADMIN gate, so only low local privileges are needed to control the listener side of the race.\nUI:N - No victim user action is required once the vulnerable listener/race setup exists; the attacker drives the RFCOMM connection attempts and close timing.\nS:U - The corruption is within the kernel networking/Bluetooth socket lifetime domain and does not cross a separate security authority such as a VM or IOMMU boundary.\nC:H - This is a slab use-after-free of a kernel struct sock, and the stale pointer is reused for locking, queueing, state checks, and callback-related state, making high confidentiality impact defensible.\nI:H - The stale listener socket can be operated on after free, including accept-queue manipulation and potential callback use, so kernel memory corruption/control-flow exploitation is defensible.\nA:H - KASAN reported a slab-use-after-free in this path, and even non-exploited triggering can crash or oops the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:36.875Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f5ec76bdbeb80f75ad0be204371afffee0f8fac8"
        },
        {
          "url": "https://git.kernel.org/stable/c/a07d741c077d4e34b16458241a94d29039386553"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f73f92f66251065a5f39b09a47cf05ea14d3107"
        },
        {
          "url": "https://git.kernel.org/stable/c/de31973ef00e5aa55496f84cf6a44bb157a34e02"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0e33e409715c617e2a20f46f99aa5403a14dfda"
        },
        {
          "url": "https://git.kernel.org/stable/c/8802413ce63175fb522a2bd609fb043a3550c720"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f4462d12133106460d7c046b95aad2491e3fddf"
        },
        {
          "url": "https://git.kernel.org/stable/c/43c441edacf953b39517a44f5e5e10a93618b226"
        }
      ],
      "title": "Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53256",
    "datePublished": "2026-06-25T08:39:46.591Z",
    "dateReserved": "2026-06-09T07:44:35.394Z",
    "dateUpdated": "2026-08-05T12:34:36.875Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}