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

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-09-17 16:07
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
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)
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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-rc1 , ≤ * (original_commit_for_fix)
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{
  "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",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.1"
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
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              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "operator": "OR"
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      "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": "2026-09-17T16:07:54.123Z",
        "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"
        },
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          "url": "https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5"
        },
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        },
        {
          "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": "2026-09-17T16:07:54.123Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-25",
      "epss": "0.00215",
      "percentile": "0.10561"
    },
    "nvd": {
      "cve": {
        "affected": [
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
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                ],
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        "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": "2026-09-17T17:17:21.730",
        "metrics": {},
        "published": "2026-09-17T17:17:21.730",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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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.



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.