CVE-2025-39861 (GCVE-0-2025-39861)

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-05-11 21:37
VLAI
Title
Bluetooth: vhci: Prevent use-after-free by removing debugfs files early
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: vhci: Prevent use-after-free by removing debugfs files early Move the creation of debugfs files into a dedicated function, and ensure they are explicitly removed during vhci_release(), before associated data structures are freed. Previously, debugfs files such as "force_suspend", "force_wakeup", and others were created under hdev->debugfs but not removed in vhci_release(). Since vhci_release() frees the backing vhci_data structure, any access to these files after release would result in use-after-free errors. Although hdev->debugfs is later freed in hci_release_dev(), user can access files after vhci_data is freed but before hdev->debugfs is released.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:23 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ab4e4380d4e158486e595013a2635190e07e28ce , < bd75eba88e88d7b896b0c737b02a74a12afc235f (git)
Affected: ab4e4380d4e158486e595013a2635190e07e28ce , < 1503756fffe76d5aea2371a4b8dee20c3577bcfd (git)
Affected: ab4e4380d4e158486e595013a2635190e07e28ce , < 7cc08f2f127b9a66f46ea918e34353811a7cb378 (git)
Affected: ab4e4380d4e158486e595013a2635190e07e28ce , < 28010791193a4503f054e8d69a950ef815deb539 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.105 , ≤ 6.6.* (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-01-14T19:23:17.100703Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-416",
                    "description": "CWE-416 Use After Free",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-14T19:23:11.773Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/bluetooth/hci_vhci.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "bd75eba88e88d7b896b0c737b02a74a12afc235f",
                  "status": "affected",
                  "version": "ab4e4380d4e158486e595013a2635190e07e28ce",
                  "versionType": "git"
                },
                {
                  "lessThan": "1503756fffe76d5aea2371a4b8dee20c3577bcfd",
                  "status": "affected",
                  "version": "ab4e4380d4e158486e595013a2635190e07e28ce",
                  "versionType": "git"
                },
                {
                  "lessThan": "7cc08f2f127b9a66f46ea918e34353811a7cb378",
                  "status": "affected",
                  "version": "ab4e4380d4e158486e595013a2635190e07e28ce",
                  "versionType": "git"
                },
                {
                  "lessThan": "28010791193a4503f054e8d69a950ef815deb539",
                  "status": "affected",
                  "version": "ab4e4380d4e158486e595013a2635190e07e28ce",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/bluetooth/hci_vhci.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.4"
                },
                {
                  "lessThan": "6.4",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.105",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.46",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.16.*",
                  "status": "unaffected",
                  "version": "6.16.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.105",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.46",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.16.6",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.17",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: vhci: Prevent use-after-free by removing debugfs files early\n\nMove the creation of debugfs files into a dedicated function, and ensure\nthey are explicitly removed during vhci_release(), before associated\ndata structures are freed.\n\nPreviously, debugfs files such as \"force_suspend\", \"force_wakeup\", and\nothers were created under hdev-\u003edebugfs but not removed in\nvhci_release(). Since vhci_release() frees the backing vhci_data\nstructure, any access to these files after release would result in\nuse-after-free errors.\n\nAlthough hdev-\u003edebugfs is later freed in hci_release_dev(), user can\naccess files after vhci_data is freed but before hdev-\u003edebugfs is\nreleased."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T21:37:51.680Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/bd75eba88e88d7b896b0c737b02a74a12afc235f"
            },
            {
              "url": "https://git.kernel.org/stable/c/1503756fffe76d5aea2371a4b8dee20c3577bcfd"
            },
            {
              "url": "https://git.kernel.org/stable/c/7cc08f2f127b9a66f46ea918e34353811a7cb378"
            },
            {
              "url": "https://git.kernel.org/stable/c/28010791193a4503f054e8d69a950ef815deb539"
            }
          ],
          "title": "Bluetooth: vhci: Prevent use-after-free by removing debugfs files early",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39861",
        "datePublished": "2025-09-19T15:26:31.519Z",
        "dateReserved": "2025-04-16T07:20:57.143Z",
        "dateUpdated": "2026-05-11T21:37:51.680Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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