CVE-2026-74509 (GCVE-0-2026-74509)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-27 12:39
VLAI
Title
Bluetooth: hci_sync: Fix advertising data UAFs
Summary
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 lookup. Likewise, update the reported transmit power through a fresh lookup after the parameter command completes. No adv_info pointer then survives an HCI command wait.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cba6b758711cab946c787f7c15be92cc749b8e1f , < 565971488191bf54a87a417abafab6ad0de72201 (git)
Affected: cba6b758711cab946c787f7c15be92cc749b8e1f , < c4cec575a6d6f7c36808a3a0017b0675968bb06b (git)
Affected: cba6b758711cab946c787f7c15be92cc749b8e1f , < 95cdcd8c82a501931fd3ae9b3811b0b6da167e94 (git)
Affected: cba6b758711cab946c787f7c15be92cc749b8e1f , < eb1d8318764de7216e6dbba29a24d69f7ce51348 (git)
Affected: cba6b758711cab946c787f7c15be92cc749b8e1f , < b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3 (git)
Affected: cba6b758711cab946c787f7c15be92cc749b8e1f , < cdc36db204ffd97b947d64374cf23a210dc74777 (git)
Affected: 42fe380baaaccbe635c34ca07b29d19b9ec2498d (git)
Affected: 5.15.210 , < 5.16 (semver)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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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: Fix advertising data UAFs\n\nhci_find_adv_instance() returns an adv_info pointer that is valid only\nwhile hdev-\u003elock is held.  The advertising command-sync paths perform\ninstance lookups without that lock and, in some cases, retain the pointer\nwhile waiting for a controller response.\n\nAn advertising termination event can therefore interleave as follows:\n\n  hci_cmd_sync_work                 hci_rx_work\n  hci_find_adv_instance()\n  __hci_cmd_sync_status()\n    wait for controller reply       hci_dev_lock()\n                                    hci_remove_adv_instance()\n                                      kfree(adv)\n  adv-\u003escan_rsp_changed = false\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\n  Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88\n  Workqueue: hci0 hci_cmd_sync_work\n  Call Trace:\n   hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\n   hci_schedule_adv_instance_sync+0x390/0x4c0\n   hci_cmd_sync_work+0x173/0x300\n  Allocated by task 87:\n   hci_add_adv_instance+0x538/0xac0\n   add_advertising+0x885/0x1160\n  Freed by task 89:\n   kfree+0x131/0x3c0\n   hci_remove_adv_instance+0x1d8/0x3b0\n   hci_le_ext_adv_term_evt+0x17b/0x730\n\nProtect the instance lookup and payload construction in the extended\nadvertising, scan response, and periodic advertising data paths.  Snapshot\nthe advertising parameters under hdev-\u003elock, but release the lock before\nwaiting for the controller.\n\nClear advertising-data dirty bits before issuing their commands and\nrestore them after a failure using a fresh lookup.  Likewise, update the\nreported transmit power through a fresh lookup after the parameter command\ncompletes.  No adv_info pointer then survives an HCI command wait."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is in the Bluetooth HCI LE extended-advertising path; a remote/adjacent peer can deliver the LE Extended Advertising Set Terminated HCI event that frees adv_info while hci_cmd_sync_work waits on the controller during scan-response/advertising-data updates on phones and other BLE devices.\nAC:L - This is a use-after-free race between hci_cmd_sync_work and hci_rx_work where the attacker controls the terminating side by repeatedly initiating BLE connections/terminations during the up-to-2s HCI command wait, and can also drive the setup side via MGMT advertising commands.\nPR:N - An adjacent Bluetooth attacker needs no account, credentials, or capabilities on the victim; exploitation only requires the victim stack to be configuring BLE advertising (normal on Android phones, laptops, and IoT) while the attacker sends over-the-air BLE traffic to trigger hci_le_ext_adv_term_evt.\nUI:N - No deliberate victim action is required beyond a device running Bluetooth with LE advertising updates (common default behavior); the attacker triggers the race remotely without social engineering, file opens, or mounts.\nS:U - Impact is kernel heap corruption and potential local privilege escalation within the same kernel security domain; it does not cross a VM, container, or IOMMU boundary.\nC:H - Multiple UAF paths read freed adv_info (e.g., eir_create_scan_rsp/adv_data) and retain dangling pointers across __hci_cmd_sync_status waits, enabling slab reuse and arbitrary kernel memory disclosure via heap grooming.\nI:H - KASAN shows a post-free write to adv_info (scan_rsp_changed); similar paths write adv_data_changed and tx_power on freed objects, providing exploitable heap corruption for arbitrary kernel writes and code execution.\nA:H - Use-after-free on adv_info in hci_cmd_sync_work can cause immediate kernel oops/panic or hung BLE subsystem during advertising reconfiguration, and is reachable from unauthenticated adjacent BLE interaction on actively advertising devices."
            }
          ]
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      "providerMetadata": {
        "dateUpdated": "2026-08-27T12:39:46.394Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/565971488191bf54a87a417abafab6ad0de72201"
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        },
        {
          "url": "https://git.kernel.org/stable/c/cdc36db204ffd97b947d64374cf23a210dc74777"
        }
      ],
      "title": "Bluetooth: hci_sync: Fix advertising data UAFs",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
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    "datePublished": "2026-08-15T12:27:31.896Z",
    "dateReserved": "2026-08-15T05:44:03.909Z",
    "dateUpdated": "2026-08-27T12:39:46.394Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-08-28",
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      "cve": "CVE-2026-74509",
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: hci_sync: Fix advertising data UAFs",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74509.json",
      "version": "1"
    },
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The advertising command-sync paths perform\\ninstance lookups without that lock and, in some cases, retain the pointer\\nwhile waiting for a controller response.\\n\\nAn advertising termination event can therefore interleave as follows:\\n\\n  hci_cmd_sync_work                 hci_rx_work\\n  hci_find_adv_instance()\\n  __hci_cmd_sync_status()\\n    wait for controller reply       hci_dev_lock()\\n                                    hci_remove_adv_instance()\\n                                      kfree(adv)\\n  adv-\u003escan_rsp_changed = false\\n\\nKASAN reported:\\n\\n  BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\\n  Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88\\n  Workqueue: hci0 hci_cmd_sync_work\\n  Call Trace:\\n   hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\\n   hci_schedule_adv_instance_sync+0x390/0x4c0\\n   hci_cmd_sync_work+0x173/0x300\\n  Allocated by task 87:\\n   hci_add_adv_instance+0x538/0xac0\\n   add_advertising+0x885/0x1160\\n  Freed by task 89:\\n   kfree+0x131/0x3c0\\n   hci_remove_adv_instance+0x1d8/0x3b0\\n   hci_le_ext_adv_term_evt+0x17b/0x730\\n\\nProtect the instance lookup and payload construction in the extended\\nadvertising, scan response, and periodic advertising data paths.  Snapshot\\nthe advertising parameters under hdev-\u003elock, but release the lock before\\nwaiting for the controller.\\n\\nClear advertising-data dirty bits before issuing their commands and\\nrestore them after a failure using a fresh lookup.  Likewise, update the\\nreported transmit power through a fresh lookup after the parameter command\\ncompletes.  No adv_info pointer then survives an HCI command wait.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hci_sync.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hci_sync.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/565971488191bf54a87a417abafab6ad0de72201\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95cdcd8c82a501931fd3ae9b3811b0b6da167e94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4cec575a6d6f7c36808a3a0017b0675968bb06b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdc36db204ffd97b947d64374cf23a210dc74777\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb1d8318764de7216e6dbba29a24d69f7ce51348\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-21T07:32:39+00:00",
      "cve": "CVE-2026-74509",
      "id": "CVE-2026-74509",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_sync: Fix advertising data UAFs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74509.json",
      "version": "3"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.