CVE-2026-97975 (GCVE-0-2026-97975)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-10-21 12:53
VLAI
Title
Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del() A NULL pointer dereference in klist_put() occurs when a child device (such as a BNEP network device in bnep_session) is concurrently being unregistered while hci_conn_del_sysfs() reparents child devices. This is caused by a race condition between hci_conn_del_sysfs() and concurrent child device unregistration (e.g. bnep_session calling unregister_netdev()). During device unregistration, device_del() snapshots a non-NULL parent pointer. Concurrently, hci_conn_del_sysfs() finds the child device using device_find_any_child() and calls device_move() to reparent it to NULL, which removes the node from its parent's klist and clears knode_parent. Subsequently, device_del() calls klist_del(&dev->p->knode_parent) using the stale parent snapshot, causing klist_put() to dereference knode_klist(n)->put on an already removed node, resulting in a NULL pointer dereference. This race was introduced by commit 27aabf27fd01 ("Bluetooth: fix use-after-free in device_for_each_child()"), which replaced device_find_child(..., __match_tty) with device_find_any_child() in hci_conn_del_sysfs(). That change was intended to avoid a use-after-free where conn->dev outlived its parent hdev->dev when child devices held references to conn->dev, because conn->dev only held a reference to hdev->dev while registered in sysfs. Fix the issue properly by taking an explicit reference to the parent device with get_device(&hdev->dev) in hci_conn_init_sysfs() and dropping it with put_device(parent) in bt_link_release() when the conn device is freed. This ensures that hdev->dev remains valid for the entire lifecycle of conn->dev, resolving the underlying use-after-free. With the parent reference held properly, restore the __match_tty filter in hci_conn_del_sysfs() so that device_move() is only invoked on persistent RFCOMM TTY devices as originally intended, eliminating the race condition with unregistering network devices.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: de5a44f351ca7efd9add9851b218f5353e2224b7 , < 55b76500546e5f2e7fdd7ae7283530b620de6e61 (git)
Affected: 7b277bd569bb6a2777f0014f84b4344f444fd49d , < 66cc55b69928b742d24b4c5b66d195ae96900e48 (git)
Affected: 27aabf27fd014ae037cc179c61b0bee7cff55b3d , < eeabdb25c3209569367e99a85ca9a503b64a646d (git)
Affected: 27aabf27fd014ae037cc179c61b0bee7cff55b3d , < 9e9ece97b8e716890793de261574b8efef7d8702 (git)
Affected: 27aabf27fd014ae037cc179c61b0bee7cff55b3d , < 9b851b09b392da68bd715601f10a5adb2d8d19b8 (git)
Affected: 6894717a1ea363c5a27010ba604f957c309d282d (git)
Affected: fb91ce37dc9a37ea23cf32b6d7b667004e93d4c5 (git)
Affected: a9584c897d1cba6265c78010bbb45ca5722c88bc (git)
Affected: 0f67ca2a80acf8b207240405b7f72d660665d3df (git)
Affected: 91e2a2e4d1336333804cd31162984f01ad8cc70f (git)
Affected: 6.6.64 , < 6.6.160 (semver)
Affected: 6.12.2 , < 6.12.114 (semver)
Affected: 5.4.297 , < 5.5 (semver)
Affected: 5.10.231 , < 5.11 (semver)
Affected: 5.15.174 , < 5.16 (semver)
Affected: 6.1.120 , < 6.2 (semver)
Affected: 6.11.11 , < 6.12 (semver)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()\n\nA NULL pointer dereference in klist_put() occurs when a child device (such\nas a BNEP network device in bnep_session) is concurrently being\nunregistered while hci_conn_del_sysfs() reparents child devices.\n\nThis is caused by a race condition between hci_conn_del_sysfs() and\nconcurrent child device unregistration (e.g. bnep_session calling\nunregister_netdev()). During device unregistration, device_del() snapshots\na non-NULL parent pointer. Concurrently, hci_conn_del_sysfs() finds the\nchild device using device_find_any_child() and calls device_move() to\nreparent it to NULL, which removes the node from its parent\u0027s klist and\nclears knode_parent. Subsequently, device_del() calls\nklist_del(\u0026dev-\u003ep-\u003eknode_parent) using the stale parent snapshot, causing\nklist_put() to dereference knode_klist(n)-\u003eput on an already removed node,\nresulting in a NULL pointer dereference.\n\nThis race was introduced by commit 27aabf27fd01 (\"Bluetooth: fix\nuse-after-free in device_for_each_child()\"), which replaced\ndevice_find_child(..., __match_tty) with device_find_any_child() in\nhci_conn_del_sysfs(). That change was intended to avoid a use-after-free\nwhere conn-\u003edev outlived its parent hdev-\u003edev when child devices held\nreferences to conn-\u003edev, because conn-\u003edev only held a reference to\nhdev-\u003edev while registered in sysfs.\n\nFix the issue properly by taking an explicit reference to the parent device\nwith get_device(\u0026hdev-\u003edev) in hci_conn_init_sysfs() and dropping it with\nput_device(parent) in bt_link_release() when the conn device is freed. This\nensures that hdev-\u003edev remains valid for the entire lifecycle of conn-\u003edev,\nresolving the underlying use-after-free. With the parent reference held\nproperly, restore the __match_tty filter in hci_conn_del_sysfs() so that\ndevice_move() is only invoked on persistent RFCOMM TTY devices as\noriginally intended, eliminating the race condition with unregistering\nnetwork devices."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/55b76500546e5f2e7fdd7ae7283530b620de6e61"
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          "url": "https://git.kernel.org/stable/c/66cc55b69928b742d24b4c5b66d195ae96900e48"
        },
        {
          "url": "https://git.kernel.org/stable/c/eeabdb25c3209569367e99a85ca9a503b64a646d"
        },
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          "url": "https://git.kernel.org/stable/c/9e9ece97b8e716890793de261574b8efef7d8702"
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        {
          "url": "https://git.kernel.org/stable/c/9b851b09b392da68bd715601f10a5adb2d8d19b8"
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      ],
      "title": "Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()",
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    "cveId": "CVE-2026-97975",
    "datePublished": "2026-09-25T10:23:13.971Z",
    "dateReserved": "2026-09-25T10:18:58.207Z",
    "dateUpdated": "2026-10-21T12:53:55.330Z",
    "state": "PUBLISHED"
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      "date": "2026-11-13",
      "epss": "0.00168",
      "percentile": "0.0623"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-24T14:46:20.000Z",
      "cve": "CVE-2026-97975",
      "id": "msrc_CVE-2026-97975",
      "initial_release_date": "2026-09-28T02:03:18.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97975.json",
      "version": "4"
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      "cve": {
        "affected": [
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                "product": "Linux",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()\n\nA NULL pointer dereference in klist_put() occurs when a child device (such\nas a BNEP network device in bnep_session) is concurrently being\nunregistered while hci_conn_del_sysfs() reparents child devices.\n\nThis is caused by a race condition between hci_conn_del_sysfs() and\nconcurrent child device unregistration (e.g. bnep_session calling\nunregister_netdev()). During device unregistration, device_del() snapshots\na non-NULL parent pointer. Concurrently, hci_conn_del_sysfs() finds the\nchild device using device_find_any_child() and calls device_move() to\nreparent it to NULL, which removes the node from its parent\u0027s klist and\nclears knode_parent. Subsequently, device_del() calls\nklist_del(\u0026dev-\u003ep-\u003eknode_parent) using the stale parent snapshot, causing\nklist_put() to dereference knode_klist(n)-\u003eput on an already removed node,\nresulting in a NULL pointer dereference.\n\nThis race was introduced by commit 27aabf27fd01 (\"Bluetooth: fix\nuse-after-free in device_for_each_child()\"), which replaced\ndevice_find_child(..., __match_tty) with device_find_any_child() in\nhci_conn_del_sysfs(). That change was intended to avoid a use-after-free\nwhere conn-\u003edev outlived its parent hdev-\u003edev when child devices held\nreferences to conn-\u003edev, because conn-\u003edev only held a reference to\nhdev-\u003edev while registered in sysfs.\n\nFix the issue properly by taking an explicit reference to the parent device\nwith get_device(\u0026hdev-\u003edev) in hci_conn_init_sysfs() and dropping it with\nput_device(parent) in bt_link_release() when the conn device is freed. This\nensures that hdev-\u003edev remains valid for the entire lifecycle of conn-\u003edev,\nresolving the underlying use-after-free. With the parent reference held\nproperly, restore the __match_tty filter in hci_conn_del_sysfs() so that\ndevice_move() is only invoked on persistent RFCOMM TTY devices as\noriginally intended, eliminating the race condition with unregistering\nnetwork devices."
          }
        ],
        "id": "CVE-2026-97975",
        "lastModified": "2026-10-21T13:21:18.100",
        "metrics": {},
        "published": "2026-09-25T11:17:25.427",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/55b76500546e5f2e7fdd7ae7283530b620de6e61"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/66cc55b69928b742d24b4c5b66d195ae96900e48"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9b851b09b392da68bd715601f10a5adb2d8d19b8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9e9ece97b8e716890793de261574b8efef7d8702"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eeabdb25c3209569367e99a85ca9a503b64a646d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T02:34:14+00:00",
      "cve": "CVE-2026-97975",
      "id": "CVE-2026-97975",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_affected": "124",
      "product_status:known_not_affected": "79",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97975.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-12T00:54:17Z",
      "cve": "CVE-2026-97975",
      "id": "CVE-2026-97975",
      "initial_release_date": "2026-09-28T23:41:49Z",
      "product_status:known_affected": "81",
      "product_status:known_not_affected": "269",
      "product_status:recommended": "73",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-97975",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-97975.json",
      "version": "5"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.

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

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.