Vulnerability-Lookup

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

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/18174b166547ef41973cc19feb5ef9cab39a8def
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4aafb47301a799d3e01230d6568c4e93524e1523
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/801fb950cae7048eb7d83b18857d1ca37b8cd5a4
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bfce253f039eb5f58b810af267942a9f59207254
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c6792c441767256030606eb82dca5d5fc360dd9a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c741977e413f5b49d306700820fb55ccb8269f5a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c

Impacted products

	Vendor	Product	Version

JSON

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"
}

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

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-07 06:49

Title

Bluetooth: RFCOMM: avoid socket lock inversion in listener cleanup

Summary

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

7 references

URL	Tags
https://git.kernel.org/stable/c/eb4adaa46e4c9e6ef…
https://git.kernel.org/stable/c/4aafb47301a799d3e…
https://git.kernel.org/stable/c/c741977e413f5b49d…
https://git.kernel.org/stable/c/c6792c44176725603…
https://git.kernel.org/stable/c/bfce253f039eb5f58…
https://git.kernel.org/stable/c/18174b166547ef419…
https://git.kernel.org/stable/c/801fb950cae7048eb…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfce253f039eb5f58b810af267942a9f59207254"
        },
        {
          "url": "https://git.kernel.org/stable/c/18174b166547ef41973cc19feb5ef9cab39a8def"
        },
        {
          "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"
      }
    }
  },
  "cveMetadata": {
    "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

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