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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98737

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98737

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd",
        "lessThan": "ddc9edb244cc8b5266595e8fc220e7813f2b603a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd",
        "lessThan": "52edf1c0e59dea37b8368c4a2559dca96b2fdfea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd",
        "lessThan": "333257e6e4a7bcaaea82fd357121d0f1e6b76c7b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd",
        "lessThan": "a642f498f0b08f2aa9f4a69468db92f57a72349d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd",
        "lessThan": "8ed67535fdff40ca652bcd4ac7da68d11d01bd34",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_sync.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.17"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.17",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.56",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_sync.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98737

Source reference: /cveMetadata/cveId

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Event
#48936 · Revision 1
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