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Bluetooth: hci_sync: Fix advertising data UAFs

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix advertising data UAFs hci_find_adv_instance() returns an adv_info pointer that is valid only while hdev->lock is held. The advertising command-sync paths perform instance lookups without that lock and, in some cases, retain the pointer while waiting for a controller response. An advertising termination event can therefore interleave as follows: hci_cmd_sync_work hci_rx_work hci_find_adv_instance() __hci_cmd_sync_status() wait for controller reply hci_dev_lock() hci_remove_adv_instance() kfree(adv) adv->scan_rsp_changed = false KASAN reported: BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300 Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88 Workqueue: hci0 hci_cmd_sync_work Call Trace: hci_set_ext_scan_rsp_data_sync+0x2e1/0x300 hci_schedule_adv_instance_sync+0x390/0x4c0 hci_cmd_sync_work+0x173/0x300 Allocated by task 87: hci_add_adv_instance+0x538/0xac0 add_advertising+0x885/0x1160 Freed by task 89: kfree+0x131/0x3c0 hci_remove_adv_instance+0x1d8/0x3b0 hci_le_ext_adv_term_evt+0x17b/0x730 Protect the instance lookup and payload construction in the extended advertising, scan response, and periodic advertising data paths. Snapshot the advertising parameters under hdev->lock, but release the lock before waiting for the controller. Clear advertising-data dirty bits before issuing their commands and restore them after a failure using a fresh looku

Announced Source revision 1
Original source ↗

CVE-2026-74509

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-2026-74509

Linux

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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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": "cba6b758711cab946c787f7c15be92cc749b8e1f",
        "lessThan": "565971488191bf54a87a417abafab6ad0de72201",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cba6b758711cab946c787f7c15be92cc749b8e1f",
        "lessThan": "c4cec575a6d6f7c36808a3a0017b0675968bb06b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cba6b758711cab946c787f7c15be92cc749b8e1f",
        "lessThan": "95cdcd8c82a501931fd3ae9b3811b0b6da167e94",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cba6b758711cab946c787f7c15be92cc749b8e1f",
        "lessThan": "eb1d8318764de7216e6dbba29a24d69f7ce51348",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cba6b758711cab946c787f7c15be92cc749b8e1f",
        "lessThan": "b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cba6b758711cab946c787f7c15be92cc749b8e1f",
        "lessThan": "cdc36db204ffd97b947d64374cf23a210dc74777",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "42fe380baaaccbe635c34ca07b29d19b9ec2498d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.210",
        "lessThan": "5.16",
        "versionType": "semver"
      }
    ],
    "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": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.154",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_sync.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74509

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33186 · Revision 1
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Publisher date
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