FKIE_CVE-2026-98290

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-07 07:17
Severity
7.5 (High) - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: avoid socket lock inversion in listener cleanup rfcomm_sock_cleanup_listen() closes unaccepted child sockets through rfcomm_sock_close(), which takes the child socket lock before rfcomm_dlc_close() acquires rfcomm_mutex. The RFCOMM worker takes these locks in reverse order while handling connections and DLC state changes, so lockdep reports a possible deadlock. Close dequeued children without taking their socket lock. The accept queue owns a reference to each child, and bt_accept_dequeue() locks the child while unlinking it and clearing its parent pointer. Dropping the child lock makes it important to prevent a concurrent rfcomm_connect_ind() from enqueueing a new child after cleanup observes an empty queue. Set a listening socket to BT_CLOSED while its lock is still held, before dropping the lock and draining the queue. The state check in rfcomm_connect_ind() then rejects new children once cleanup starts.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18174b166547ef41973cc19feb5ef9cab39a8def
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4aafb47301a799d3e01230d6568c4e93524e1523
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/801fb950cae7048eb7d83b18857d1ca37b8cd5a4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bfce253f039eb5f58b810af267942a9f59207254
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c6792c441767256030606eb82dca5d5fc360dd9a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c741977e413f5b49d306700820fb55ccb8269f5a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/rfcomm/sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c",
              "status": "affected",
              "version": "b7ce436a5d798bc59e71797952566608a4b4626b",
              "versionType": "git"
            },
            {
              "lessThan": "4aafb47301a799d3e01230d6568c4e93524e1523",
              "status": "affected",
              "version": "b7ce436a5d798bc59e71797952566608a4b4626b",
              "versionType": "git"
            },
            {
              "lessThan": "c741977e413f5b49d306700820fb55ccb8269f5a",
              "status": "affected",
              "version": "b7ce436a5d798bc59e71797952566608a4b4626b",
              "versionType": "git"
            },
            {
              "lessThan": "c6792c441767256030606eb82dca5d5fc360dd9a",
              "status": "affected",
              "version": "b7ce436a5d798bc59e71797952566608a4b4626b",
              "versionType": "git"
            },
            {
              "lessThan": "bfce253f039eb5f58b810af267942a9f59207254",
              "status": "affected",
              "version": "b7ce436a5d798bc59e71797952566608a4b4626b",
              "versionType": "git"
            },
            {
              "lessThan": "18174b166547ef41973cc19feb5ef9cab39a8def",
              "status": "affected",
              "version": "b7ce436a5d798bc59e71797952566608a4b4626b",
              "versionType": "git"
            },
            {
              "lessThan": "801fb950cae7048eb7d83b18857d1ca37b8cd5a4",
              "status": "affected",
              "version": "b7ce436a5d798bc59e71797952566608a4b4626b",
              "versionType": "git"
            }
          ]
        },
        {
          "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": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: avoid socket lock inversion in listener cleanup\n\nrfcomm_sock_cleanup_listen() closes unaccepted child sockets through\nrfcomm_sock_close(), which takes the child socket lock before\nrfcomm_dlc_close() acquires rfcomm_mutex. The RFCOMM worker takes these\nlocks in reverse order while handling connections and DLC state changes,\nso lockdep reports a possible deadlock.\n\nClose dequeued children without taking their socket lock. The accept queue\nowns a reference to each child, and bt_accept_dequeue() locks the child\nwhile unlinking it and clearing its parent pointer.\n\nDropping the child lock makes it important to prevent a concurrent\nrfcomm_connect_ind() from enqueueing a new child after cleanup observes an\nempty queue. Set a listening socket to BT_CLOSED while its lock is still\nheld, before dropping the lock and draining the queue. The state check in\nrfcomm_connect_ind() then rejects new children once cleanup starts."
    }
  ],
  "id": "CVE-2026-98290",
  "lastModified": "2026-10-07T07:17:08.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-06T09:18:19.317",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/18174b166547ef41973cc19feb5ef9cab39a8def"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4aafb47301a799d3e01230d6568c4e93524e1523"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/801fb950cae7048eb7d83b18857d1ca37b8cd5a4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bfce253f039eb5f58b810af267942a9f59207254"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c6792c441767256030606eb82dca5d5fc360dd9a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c741977e413f5b49d306700820fb55ccb8269f5a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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