UnratedFix available

Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.188, 6.12.110, 6.18.52, 6.6.157, 7.2.6
CVEs: CVE-2026-90254
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 22:54 UTC · Revision 1

Source evidence

Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths

core-osv · Original source

Published 17 Sept 2026, 16:07 UTC

osv:CVE-2026-90254

Kernel

Fixed versions: 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6

Complete source record

{
  "id": "40e06f4b8e7db0775df9231220d238ac6a964411acc431f258ba7dee45608bd6",
  "url": "https://osv.dev/vulnerability/CVE-2026-90254",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-90254",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90254",
      "aliases": [
        "CVE-2026-90254"
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      "affected": [
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          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "events": [
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                  "fixed": "9c3b6c1413bd0b4993642d987616331f84d9b7f5"
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                {
                  "fixed": "bb5ca1cc7744c41c59002bd6523714a685ae6595"
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                  "fixed": "120d8dc042e3d45073bb6e50ee7b058a0b182627"
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              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                  "fixed": "7.2.6"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90254.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.133582214Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/120d8dc042e3d45073bb6e50ee7b058a0b182627",
        "https://git.kernel.org/stable/c/193182c6467f508a8a61d5db506d796ffed6eee6",
        "https://git.kernel.org/stable/c/2e3d827cd56865c14f6ca118bbccd7801091fb21",
        "https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5",
        "https://git.kernel.org/stable/c/bb5ca1cc7744c41c59002bd6523714a685ae6595",
        "https://git.kernel.org/stable/c/c2019224a766245b7db39d87fdfe84c3fdc879d9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90254.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90254",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90254.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90254",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 507759,
  "published_at": "2026-09-17T16:07:54.123+00:00"
}