CVE-2026-90254 (GCVE-0-2026-90254)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-10-19 09:00
VLAI
Title
Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths adv_timeout_expire() hands a kmalloc()ed instance byte to hci_cmd_sync_queue() with a NULL destroy callback, and only adv_timeout_expire_sync() frees it. That leaks on two paths: - the return value is not checked, and hci_cmd_sync_queue() does not take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM); - a cancelled entry is not released, as _hci_cmd_sync_cancel_entry() does not free entry->data when there is no destroy callback. hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered. Free the buffer from a destroy callback, and in the caller when the entry could not be queued at all.
Severity
No CVSS data available.
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: c249ea9b4309cf3250c5bbb42a05d38d0ed9071c , < c2019224a766245b7db39d87fdfe84c3fdc879d9 (git)
Affected: c249ea9b4309cf3250c5bbb42a05d38d0ed9071c , < 193182c6467f508a8a61d5db506d796ffed6eee6 (git)
Affected: c249ea9b4309cf3250c5bbb42a05d38d0ed9071c , < 2e3d827cd56865c14f6ca118bbccd7801091fb21 (git)
Affected: c249ea9b4309cf3250c5bbb42a05d38d0ed9071c , < 9c3b6c1413bd0b4993642d987616331f84d9b7f5 (git)
Affected: c249ea9b4309cf3250c5bbb42a05d38d0ed9071c , < bb5ca1cc7744c41c59002bd6523714a685ae6595 (git)
Affected: c249ea9b4309cf3250c5bbb42a05d38d0ed9071c , < 120d8dc042e3d45073bb6e50ee7b058a0b182627 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c2019224a766245b7db39d87fdfe84c3fdc879d9",
              "status": "affected",
              "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
              "versionType": "git"
            },
            {
              "lessThan": "193182c6467f508a8a61d5db506d796ffed6eee6",
              "status": "affected",
              "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
              "versionType": "git"
            },
            {
              "lessThan": "2e3d827cd56865c14f6ca118bbccd7801091fb21",
              "status": "affected",
              "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
              "versionType": "git"
            },
            {
              "lessThan": "9c3b6c1413bd0b4993642d987616331f84d9b7f5",
              "status": "affected",
              "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
              "versionType": "git"
            },
            {
              "lessThan": "bb5ca1cc7744c41c59002bd6523714a685ae6595",
              "status": "affected",
              "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
              "versionType": "git"
            },
            {
              "lessThan": "120d8dc042e3d45073bb6e50ee7b058a0b182627",
              "status": "affected",
              "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: free the advertising instance on the failure and cancel paths\n\nadv_timeout_expire() hands a kmalloc()ed instance byte to\nhci_cmd_sync_queue() with a NULL destroy callback, and only\nadv_timeout_expire_sync() frees it. That leaks on two paths:\n\n - the return value is not checked, and hci_cmd_sync_queue() does not\n   take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM);\n\n - a cancelled entry is not released, as _hci_cmd_sync_cancel_entry()\n   does not free entry-\u003edata when there is no destroy callback.\n   hci_cmd_sync_clear() cancels every pending entry when the controller\n   is unregistered.\n\nFree the buffer from a destroy callback, and in the caller when the entry\ncould not be queued at all."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:00:30.990Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c2019224a766245b7db39d87fdfe84c3fdc879d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/193182c6467f508a8a61d5db506d796ffed6eee6"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e3d827cd56865c14f6ca118bbccd7801091fb21"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb5ca1cc7744c41c59002bd6523714a685ae6595"
        },
        {
          "url": "https://git.kernel.org/stable/c/120d8dc042e3d45073bb6e50ee7b058a0b182627"
        }
      ],
      "title": "Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90254",
    "datePublished": "2026-09-17T16:07:54.123Z",
    "dateReserved": "2026-09-11T19:38:34.796Z",
    "dateUpdated": "2026-10-19T09:00:30.990Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-90254",
      "date": "2026-10-23",
      "epss": "0.00206",
      "percentile": "0.1007"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/bluetooth/hci_sync.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "c2019224a766245b7db39d87fdfe84c3fdc879d9",
                    "status": "affected",
                    "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "193182c6467f508a8a61d5db506d796ffed6eee6",
                    "status": "affected",
                    "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2e3d827cd56865c14f6ca118bbccd7801091fb21",
                    "status": "affected",
                    "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "9c3b6c1413bd0b4993642d987616331f84d9b7f5",
                    "status": "affected",
                    "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "bb5ca1cc7744c41c59002bd6523714a685ae6595",
                    "status": "affected",
                    "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "120d8dc042e3d45073bb6e50ee7b058a0b182627",
                    "status": "affected",
                    "version": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/bluetooth/hci_sync.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.1"
                  },
                  {
                    "lessThan": "6.1",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.188",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.157",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.52",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "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: hci_sync: free the advertising instance on the failure and cancel paths\n\nadv_timeout_expire() hands a kmalloc()ed instance byte to\nhci_cmd_sync_queue() with a NULL destroy callback, and only\nadv_timeout_expire_sync() frees it. That leaks on two paths:\n\n - the return value is not checked, and hci_cmd_sync_queue() does not\n   take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM);\n\n - a cancelled entry is not released, as _hci_cmd_sync_cancel_entry()\n   does not free entry-\u003edata when there is no destroy callback.\n   hci_cmd_sync_clear() cancels every pending entry when the controller\n   is unregistered.\n\nFree the buffer from a destroy callback, and in the caller when the entry\ncould not be queued at all."
          }
        ],
        "id": "CVE-2026-90254",
        "lastModified": "2026-10-19T09:19:17.390",
        "metrics": {},
        "published": "2026-09-17T17:17:21.730",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/120d8dc042e3d45073bb6e50ee7b058a0b182627"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/193182c6467f508a8a61d5db506d796ffed6eee6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2e3d827cd56865c14f6ca118bbccd7801091fb21"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bb5ca1cc7744c41c59002bd6523714a685ae6595"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c2019224a766245b7db39d87fdfe84c3fdc879d9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-05T20:02:43+00:00",
      "cve": "CVE-2026-90254",
      "id": "CVE-2026-90254",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "186",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90254.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-20T00:41:00Z",
      "cve": "CVE-2026-90254",
      "id": "CVE-2026-90254",
      "initial_release_date": "2026-09-18T00:19:12Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "318",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90254",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90254.json",
      "version": "5"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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

Loading timeline…




    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.