CVE-2026-98290 (GCVE-0-2026-98290)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-07 06:49
VLAI
Title
Bluetooth: RFCOMM: avoid socket lock inversion in listener cleanup
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.
Severity
7.5 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6619 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b7ce436a5d798bc59e71797952566608a4b4626b , < eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c (git)
Affected: b7ce436a5d798bc59e71797952566608a4b4626b , < 4aafb47301a799d3e01230d6568c4e93524e1523 (git)
Affected: b7ce436a5d798bc59e71797952566608a4b4626b , < c741977e413f5b49d306700820fb55ccb8269f5a (git)
Affected: b7ce436a5d798bc59e71797952566608a4b4626b , < c6792c441767256030606eb82dca5d5fc360dd9a (git)
Affected: b7ce436a5d798bc59e71797952566608a4b4626b , < bfce253f039eb5f58b810af267942a9f59207254 (git)
Affected: b7ce436a5d798bc59e71797952566608a4b4626b , < 18174b166547ef41973cc19feb5ef9cab39a8def (git)
Affected: b7ce436a5d798bc59e71797952566608a4b4626b , < 801fb950cae7048eb7d83b18857d1ca37b8cd5a4 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/rfcomm/sock.c"
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              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
        {
          "nodes": [
            {
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      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - A Bluetooth peer drives both halves of this bug. Its RFCOMM SABM creates a child in rfcomm_connect_ind(), and its later DISC makes krfcommd call rfcomm_sk_state_change() on that child (taking lock_sock(child) under rfcomm_mutex, and dereferencing bt_sk(child)-\u003eparent). Bluetooth requires radio range, so the vector is Adjacent.\nAC:H - The peer can send SABM and DISC at will, but both the ABBA deadlock and the late-enqueue window need the victim to close its listener at that moment. That window runs from rfcomm_sock_shutdown dropping the listener lock to cleanup_listen setting BT_CLOSED, and the peer cannot control when the application closes the socket.\nPR:N - rfcomm_connect_ind() only checks for a BT_LISTEN socket on the channel and for room in the backlog before it enqueues a child, so the peer needs no credentials.\nUI:N - No victim action beyond normal operation is needed. A service closing its RFCOMM listener on its own (exit, restart, or Bluetooth teardown) is a timing condition and is counted in AC:H.\nS:U - The deadlock and the dangling parent pointer both stay inside kernel RFCOMM socket state and do not cross a virtualization or hardware boundary.\nC:H - A child enqueued after the drain keeps bt_sk(sk)-\u003eparent pointing at the listener, but bt_accept_enqueue takes no reference on it, so rfcomm_sock_kill frees the listener while the pointer is still live. A later state change then reads the freed sock through parent-\u003esk_data_ready, a use-after-free that can be groomed for disclosure.\nI:H - On the peer\u0027s DISC, rfcomm_sk_state_change calls bt_accept_unlink(), which does list_del on the freed listener\u0027s accept_q and decrements its backlog, then makes an indirect call through the freed parent-\u003esk_data_ready. That is a write to freed memory and a call through a function pointer an attacker can replace.\nA:H - The ABBA blocks krfcommd forever while it holds rfcomm_mutex (rfcomm_dlc_close in the closer against lock_sock(child) in rfcomm_sk_state_change). That stops all RFCOMM processing and hangs the closing task, and the use-after-free path can oops the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T06:49:55.796Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4aafb47301a799d3e01230d6568c4e93524e1523"
        },
        {
          "url": "https://git.kernel.org/stable/c/c741977e413f5b49d306700820fb55ccb8269f5a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c6792c441767256030606eb82dca5d5fc360dd9a"
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        },
        {
          "url": "https://git.kernel.org/stable/c/801fb950cae7048eb7d83b18857d1ca37b8cd5a4"
        }
      ],
      "title": "Bluetooth: RFCOMM: avoid socket lock inversion in listener cleanup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98290",
    "datePublished": "2026-10-06T08:45:50.299Z",
    "dateReserved": "2026-09-25T10:25:14.336Z",
    "dateUpdated": "2026-10-07T06:49:55.796Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-11",
      "epss": "0.00257",
      "percentile": "0.1602"
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          {
            "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"
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          },
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            "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",
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          },
          {
            "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-10T23:25:20+00:00",
      "cve": "CVE-2026-98290",
      "id": "CVE-2026-98290",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "248",
      "product_status:known_not_affected": "29",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: RFCOMM: avoid socket lock inversion in listener cleanup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98290.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-07T16:28:07Z",
      "cve": "CVE-2026-98290",
      "id": "CVE-2026-98290",
      "initial_release_date": "2026-10-07T16:28:07Z",
      "product_status:known_affected": "84",
      "product_status:known_not_affected": "263",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98290",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98290.json",
      "version": "2"
    }
  }
}



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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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.