CVE-2026-97908 (GCVE-0-2026-97908)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-10-30 12:37
VLAI
Title
Bluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev The command and ACL RPMsg endpoints store struct btqcomsmd as their callback private data. The receive callbacks dereference btq->hdev without taking an hci_dev reference. The current teardown order frees the hci_dev before destroying the RPMsg endpoints in both the hci_register_dev() error path and the driver remove path. If WCNSS delivers data in that window, the endpoint callback can run with an already freed hci_dev and pass it to the Bluetooth core. For qcom_smd endpoints, rpmsg_destroy_ept() closes the channel and clears the callback under the channel recv_lock. The receive path holds the same lock while invoking the callback, so destroying the endpoints first both prevents new callbacks and serializes with any callback already running. Destroy the command and ACL endpoints before hci_free_dev(). Keep hci_unregister_dev() first during remove so the HCI core stops issuing operations before the transport endpoints are shut down. In the full registration-error cleanup path, return directly after freeing the hci_dev to avoid falling through to the partial-construction labels and destroying the endpoints twice.
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: 5052de8deff5619a9b7071f00084fd0264b58e17 , < b9b34cc149f8344d1cffbf318eb1c8cb414f74ac (git)
Affected: 5052de8deff5619a9b7071f00084fd0264b58e17 , < e2a0d9401368ec29bd0cdbfe9545d2a800429875 (git)
Affected: 5052de8deff5619a9b7071f00084fd0264b58e17 , < f5e4f81f4e075cd5ec062f81b576b88cdee998d1 (git)
Affected: 5052de8deff5619a9b7071f00084fd0264b58e17 , < aaa7f676418e1eb2c4ef0d4e4b07812b25e7b404 (git)
Affected: 5052de8deff5619a9b7071f00084fd0264b58e17 , < 962dcc1d8a52e64428cae07806e7f6b8d3ec6ac0 (git)
Affected: 5052de8deff5619a9b7071f00084fd0264b58e17 , < 2dcc2240b4e5f6e5dce1736f82666aba40eb3b13 (git)
Affected: 5052de8deff5619a9b7071f00084fd0264b58e17 , < 2d016208a011558f211ec9687889df8318654730 (git)
Affected: 5052de8deff5619a9b7071f00084fd0264b58e17 , < f5a427b16e45210dee656b0860728f3d496dee85 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev\n\nThe command and ACL RPMsg endpoints store struct btqcomsmd as their\ncallback private data. The receive callbacks dereference btq-\u003ehdev\nwithout taking an hci_dev reference.\n\nThe current teardown order frees the hci_dev before destroying the RPMsg\nendpoints in both the hci_register_dev() error path and the driver remove\npath. If WCNSS delivers data in that window, the endpoint callback can\nrun with an already freed hci_dev and pass it to the Bluetooth core.\n\nFor qcom_smd endpoints, rpmsg_destroy_ept() closes the channel and clears\nthe callback under the channel recv_lock. The receive path holds the same\nlock while invoking the callback, so destroying the endpoints first both\nprevents new callbacks and serializes with any callback already running.\n\nDestroy the command and ACL endpoints before hci_free_dev(). Keep\nhci_unregister_dev() first during remove so the HCI core stops issuing\noperations before the transport endpoints are shut down. In the full\nregistration-error cleanup path, return directly after freeing the hci_dev\nto avoid falling through to the partial-construction labels and destroying\nthe endpoints twice."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:37:42.482Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/b9b34cc149f8344d1cffbf318eb1c8cb414f74ac"
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        },
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          "url": "https://git.kernel.org/stable/c/f5a427b16e45210dee656b0860728f3d496dee85"
        }
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    "cveId": "CVE-2026-97908",
    "datePublished": "2026-09-25T10:22:32.837Z",
    "dateReserved": "2026-09-25T10:18:58.200Z",
    "dateUpdated": "2026-10-30T12:37:42.482Z",
    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97908.json",
      "version": "5"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev\n\nThe command and ACL RPMsg endpoints store struct btqcomsmd as their\ncallback private data. The receive callbacks dereference btq-\u003ehdev\nwithout taking an hci_dev reference.\n\nThe current teardown order frees the hci_dev before destroying the RPMsg\nendpoints in both the hci_register_dev() error path and the driver remove\npath. If WCNSS delivers data in that window, the endpoint callback can\nrun with an already freed hci_dev and pass it to the Bluetooth core.\n\nFor qcom_smd endpoints, rpmsg_destroy_ept() closes the channel and clears\nthe callback under the channel recv_lock. The receive path holds the same\nlock while invoking the callback, so destroying the endpoints first both\nprevents new callbacks and serializes with any callback already running.\n\nDestroy the command and ACL endpoints before hci_free_dev(). Keep\nhci_unregister_dev() first during remove so the HCI core stops issuing\noperations before the transport endpoints are shut down. In the full\nregistration-error cleanup path, return directly after freeing the hci_dev\nto avoid falling through to the partial-construction labels and destroying\nthe endpoints twice."
          }
        ],
        "id": "CVE-2026-97908",
        "lastModified": "2026-10-30T13:21:10.340",
        "metrics": {},
        "published": "2026-09-25T11:17:17.730",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T02:32:10+00:00",
      "cve": "CVE-2026-97908",
      "id": "CVE-2026-97908",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97908.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-11T01:08:58Z",
      "cve": "CVE-2026-97908",
      "id": "CVE-2026-97908",
      "initial_release_date": "2026-10-01T00:38:21Z",
      "product_status:known_affected": "730",
      "product_status:known_not_affected": "35",
      "product_status:recommended": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-97908",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-97908.json",
      "version": "11"
    }
  }
}



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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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