Bluetooth: hci_sync: Fix inquiry cache use-after-free

{
  "id": "5a988b390cfa1f1ca97bea0c3dac1e8797d16909d2ead3c9a63466ea04eda834",
  "url": "https://osv.dev/vulnerability/CVE-2026-98737",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci_sync: Fix inquiry cache use-after-free",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix inquiry cache use-after-free The sync command worker holds hdev->req_lock, but inquiry-cache updates and flushes use hdev->lock. Both hci_acl_create_conn_sync() and hci_stop_discovery_sync() look up entries and read their fields without taking hdev->lock. After either lookup returns, a concurrent HCIINQUIRY ioctl can acquire hdev->lock and flush the cache, freeing the entry. The worker then reads the freed entry while preparing a create-connection or remote-name-cancel command. The list traversal also races with cache updates and removal. KASAN reported these accesses: BUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5f1/0x650 Workqueue: hci0 hci_cmd_sync_work Call Trace: hci_acl_create_conn_sync+0x5f1/0x650 hci_cmd_sync_work+0x13c/0x290 Allocated by task 90: hci_inquiry_cache_update+0x3e6/0x7d0 hci_inquiry_result_evt+0x3cb/0x560 Freed by task 93: hci_inquiry_cache_flush+0x111/0x2b0 hci_inquiry+0x2f2/0x780 hci_sock_ioctl+0x269/0x5f0 BUG: KASAN: slab-use-after-free in hci_stop_discovery_sync+0x3b1/0x3c0 Workqueue: hci0 hci_cmd_sync_work Call Trace: hci_stop_discovery_sync+0x3b1/0x3c0 hci_cmd_sync_work+0x173/0x300 Allocated by task 86: hci_inquiry_cache_update+0x483/0x940 hci_inquiry_result_evt+0x3cb/0x560 Freed by task 91: hci_inquiry_cache_flush+0x13e/0x2f0 hci_inquiry+0x2f2/0x780 hci_sock_ioctl+0x269/0x5f0 Hold hdev->lock across each lookup and all reads from its result.",
    "evidence": "osv:CVE-2026-98737",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98737",
      "aliases": [
        "CVE-2026-98737"
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "ddc9edb244cc8b5266595e8fc220e7813f2b603a"
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                {
                  "fixed": "52edf1c0e59dea37b8368c4a2559dca96b2fdfea"
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                {
                  "fixed": "333257e6e4a7bcaaea82fd357121d0f1e6b76c7b"
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                {
                  "fixed": "a642f498f0b08f2aa9f4a69468db92f57a72349d"
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                {
                  "fixed": "8ed67535fdff40ca652bcd4ac7da68d11d01bd34"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98737.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
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                {
                  "fixed": "6.6.160"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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                {
                  "fixed": "6.12.113"
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            {
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              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.56"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.10"
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              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98737.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.368318631Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/333257e6e4a7bcaaea82fd357121d0f1e6b76c7b",
        "https://git.kernel.org/stable/c/52edf1c0e59dea37b8368c4a2559dca96b2fdfea",
        "https://git.kernel.org/stable/c/8ed67535fdff40ca652bcd4ac7da68d11d01bd34",
        "https://git.kernel.org/stable/c/a642f498f0b08f2aa9f4a69468db92f57a72349d",
        "https://git.kernel.org/stable/c/ddc9edb244cc8b5266595e8fc220e7813f2b603a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98737.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98737",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98737.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98737",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 489802,
  "published_at": "2026-10-18T15:47:14.936+00:00"
}