CVE-2026-46275 (GCVE-0-2026-46275)

Vulnerability from cvelistv5 – Published: 2026-06-08 14:30 – Updated: 2026-06-14 18:05
VLAI
Title
Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths Vulnerabilities leading to Use-After-Free (UAF) and Null Pointer Dereference (NPD) conditions were observed in the lifecycle management of hci_uart. The primary issue arises because the workqueues (init_ready and write_work) are only flushed/cancelled if the HCI_UART_PROTO_READY flag is set during TTY close. If a hangup occurs before setup completes, hci_uart_tty_close() skips the teardown of these workqueues and proceeds to free the `hu` struct. When the scheduled work executes later, it blindly dereferences the freed `hu` struct. Furthermore, several data races and UAFs were identified in the teardown sequence: 1. Calling hci_uart_flush() from hci_uart_close() without effectively disabling write_work causes a race condition where both can concurrently double-free hu->tx_skb. This happens because protocol timers can concurrently invoke hci_uart_tx_wakeup() and requeue write_work. 2. Calling hci_free_dev(hdev) before hu->proto->close(hu) causes a UAF when vendor specific protocol close callbacks dereference hu->hdev. 3. In the initialization error paths, failing to take the proto_lock write lock before clearing PROTO_READY leads to races with active readers. Additionally, hci_uart_tty_receive() accesses hu->hdev outside the read lock, leading to UAFs if the initialization error path frees hdev concurrently. Fix these synchronization and lifecycle issues by: 1. Re-ordering hci_uart_tty_close() to clear HCI_UART_PROTO_READY first, followed immediately by a cancel_work_sync(&hu->write_work). Clearing the flag locks out concurrent protocol timers from successfully invoking hci_uart_tx_wakeup(), effectively rendering the cancellation permanent and preventing the tx_skb double-free. 2. Note: Clearing PROTO_READY early causes hci_uart_close() to skip hu->proto->flush(). This is perfectly safe in the tty_close path because hu->proto->close() executes shortly after, which intrinsically purges all protocol SKB queues and tears down the state. 3. Relocating hu->proto->close(hu) strictly prior to hci_free_dev(hdev) across all close and error paths to prevent vendor-level UAFs. 4. Moving the hdev->stat.byte_rx increment in hci_uart_tty_receive() inside the proto_lock read-side critical section to safely synchronize with device unregistration. 5. Adding cancel_work_sync(&hu->write_work) to hci_uart_close() to safely flush the workqueue before hci_uart_flush() is invoked via the HCI core. 6. Utilizing cancel_work_sync() instead of disable_work_sync() across all paths to prevent permanently breaking user-space retry capabilities.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < 78aad93e938f013d9272fe0ee168f27883afa95c (git)
Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < e2d19969c8d9198ecc3090bcd5312ecd503a3339 (git)
Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < c85cff648a2bc92322912db5f1727ad05afae7b6 (git)
Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < 9d20d48be2c4a071fb015eb09bda2cecd25daf34 (git)
Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < 81c7a3c22a0f2808cf4ae0b4908f59763b23606d (git)
Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < 192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894 (git)
Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < 7338031946bd06f6dff149e67b60c4cd083bfea8 (git)
Affected: 3b799254cf6f481460719023d7a18f46651e5e7f , < c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b (git)
Affected: cd27019bc149f20f12ebec943c2b4c775745a5a0 (git)
Affected: aea63181b6fcb6b9ccde1ada9ea51be19c4015af (git)
Affected: 0d234d1135dcd8876de0576dac68efd0a87eef87 (git)
Affected: 3fe978892ab46efc2f3830d9abc015eff72caaf9 (git)
Affected: 0d987e14bebaf0f67ee7dbefaf6165c62cd1d27f (git)
Affected: 4.14.203 , < 4.15 (semver)
Affected: 4.19.153 , < 4.20 (semver)
Affected: 5.4.73 , < 5.5 (semver)
Affected: 5.8.17 , < 5.9 (semver)
Affected: 5.9.2 , < 5.10 (semver)
Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_uart: fix UAFs and race conditions in close and init paths\n\nVulnerabilities leading to Use-After-Free (UAF) and Null Pointer\nDereference (NPD) conditions were observed in the lifecycle management\nof hci_uart.\n\nThe primary issue arises because the workqueues (init_ready and\nwrite_work) are only flushed/cancelled if the HCI_UART_PROTO_READY\nflag is set during TTY close. If a hangup occurs before setup completes,\nhci_uart_tty_close() skips the teardown of these workqueues and\nproceeds to free the `hu` struct. When the scheduled work executes\nlater, it blindly dereferences the freed `hu` struct.\n\nFurthermore, several data races and UAFs were identified in the teardown\nsequence:\n1. Calling hci_uart_flush() from hci_uart_close() without effectively\n   disabling write_work causes a race condition where both can concurrently\n   double-free hu-\u003etx_skb. This happens because protocol timers can\n   concurrently invoke hci_uart_tx_wakeup() and requeue write_work.\n2. Calling hci_free_dev(hdev) before hu-\u003eproto-\u003eclose(hu) causes a UAF\n   when vendor specific protocol close callbacks dereference hu-\u003ehdev.\n3. In the initialization error paths, failing to take the proto_lock\n   write lock before clearing PROTO_READY leads to races with active\n   readers. Additionally, hci_uart_tty_receive() accesses hu-\u003ehdev\n   outside the read lock, leading to UAFs if the initialization error\n   path frees hdev concurrently.\n\nFix these synchronization and lifecycle issues by:\n1. Re-ordering hci_uart_tty_close() to clear HCI_UART_PROTO_READY first,\n   followed immediately by a cancel_work_sync(\u0026hu-\u003ewrite_work). Clearing\n   the flag locks out concurrent protocol timers from successfully invoking\n   hci_uart_tx_wakeup(), effectively rendering the cancellation permanent\n   and preventing the tx_skb double-free.\n2. Note: Clearing PROTO_READY early causes hci_uart_close() to skip\n   hu-\u003eproto-\u003eflush(). This is perfectly safe in the tty_close path\n   because hu-\u003eproto-\u003eclose() executes shortly after, which intrinsically\n   purges all protocol SKB queues and tears down the state.\n3. Relocating hu-\u003eproto-\u003eclose(hu) strictly prior to hci_free_dev(hdev)\n   across all close and error paths to prevent vendor-level UAFs.\n4. Moving the hdev-\u003estat.byte_rx increment in hci_uart_tty_receive()\n   inside the proto_lock read-side critical section to safely synchronize\n   with device unregistration.\n5. Adding cancel_work_sync(\u0026hu-\u003ewrite_work) to hci_uart_close() to safely\n   flush the workqueue before hci_uart_flush() is invoked via the HCI core.\n6. Utilizing cancel_work_sync() instead of disable_work_sync() across\n   all paths to prevent permanently breaking user-space retry capabilities."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:05:39.086Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/78aad93e938f013d9272fe0ee168f27883afa95c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2d19969c8d9198ecc3090bcd5312ecd503a3339"
        },
        {
          "url": "https://git.kernel.org/stable/c/c85cff648a2bc92322912db5f1727ad05afae7b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d20d48be2c4a071fb015eb09bda2cecd25daf34"
        },
        {
          "url": "https://git.kernel.org/stable/c/81c7a3c22a0f2808cf4ae0b4908f59763b23606d"
        },
        {
          "url": "https://git.kernel.org/stable/c/192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894"
        },
        {
          "url": "https://git.kernel.org/stable/c/7338031946bd06f6dff149e67b60c4cd083bfea8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b"
        }
      ],
      "title": "Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46275",
    "datePublished": "2026-06-08T14:30:54.232Z",
    "dateReserved": "2026-05-13T15:03:33.109Z",
    "dateUpdated": "2026-06-14T18:05:39.086Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46275",
      "date": "2026-06-16",
      "epss": "0.00204",
      "percentile": "0.10346"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46275\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-08T16:16:40.863\",\"lastModified\":\"2026-06-14T06:16:22.753\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_uart: fix UAFs and race conditions in close and init paths\\n\\nVulnerabilities leading to Use-After-Free (UAF) and Null Pointer\\nDereference (NPD) conditions were observed in the lifecycle management\\nof hci_uart.\\n\\nThe primary issue arises because the workqueues (init_ready and\\nwrite_work) are only flushed/cancelled if the HCI_UART_PROTO_READY\\nflag is set during TTY close. If a hangup occurs before setup completes,\\nhci_uart_tty_close() skips the teardown of these workqueues and\\nproceeds to free the `hu` struct. When the scheduled work executes\\nlater, it blindly dereferences the freed `hu` struct.\\n\\nFurthermore, several data races and UAFs were identified in the teardown\\nsequence:\\n1. Calling hci_uart_flush() from hci_uart_close() without effectively\\n   disabling write_work causes a race condition where both can concurrently\\n   double-free hu-\u003etx_skb. This happens because protocol timers can\\n   concurrently invoke hci_uart_tx_wakeup() and requeue write_work.\\n2. Calling hci_free_dev(hdev) before hu-\u003eproto-\u003eclose(hu) causes a UAF\\n   when vendor specific protocol close callbacks dereference hu-\u003ehdev.\\n3. In the initialization error paths, failing to take the proto_lock\\n   write lock before clearing PROTO_READY leads to races with active\\n   readers. Additionally, hci_uart_tty_receive() accesses hu-\u003ehdev\\n   outside the read lock, leading to UAFs if the initialization error\\n   path frees hdev concurrently.\\n\\nFix these synchronization and lifecycle issues by:\\n1. Re-ordering hci_uart_tty_close() to clear HCI_UART_PROTO_READY first,\\n   followed immediately by a cancel_work_sync(\u0026hu-\u003ewrite_work). Clearing\\n   the flag locks out concurrent protocol timers from successfully invoking\\n   hci_uart_tx_wakeup(), effectively rendering the cancellation permanent\\n   and preventing the tx_skb double-free.\\n2. Note: Clearing PROTO_READY early causes hci_uart_close() to skip\\n   hu-\u003eproto-\u003eflush(). This is perfectly safe in the tty_close path\\n   because hu-\u003eproto-\u003eclose() executes shortly after, which intrinsically\\n   purges all protocol SKB queues and tears down the state.\\n3. Relocating hu-\u003eproto-\u003eclose(hu) strictly prior to hci_free_dev(hdev)\\n   across all close and error paths to prevent vendor-level UAFs.\\n4. Moving the hdev-\u003estat.byte_rx increment in hci_uart_tty_receive()\\n   inside the proto_lock read-side critical section to safely synchronize\\n   with device unregistration.\\n5. Adding cancel_work_sync(\u0026hu-\u003ewrite_work) to hci_uart_close() to safely\\n   flush the workqueue before hci_uart_flush() is invoked via the HCI core.\\n6. Utilizing cancel_work_sync() instead of disable_work_sync() across\\n   all paths to prevent permanently breaking user-space retry capabilities.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7338031946bd06f6dff149e67b60c4cd083bfea8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78aad93e938f013d9272fe0ee168f27883afa95c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81c7a3c22a0f2808cf4ae0b4908f59763b23606d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d20d48be2c4a071fb015eb09bda2cecd25daf34\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c85cff648a2bc92322912db5f1727ad05afae7b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2d19969c8d9198ecc3090bcd5312ecd503a3339\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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.