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CVE-2025-40308 (GCVE-0-2025-40308)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-05-23 16:02
VLAI
Title
Bluetooth: bcsp: receive data only if registered
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bcsp: receive data only if registered Currently, bcsp_recv() can be called even when the BCSP protocol has not been registered. This leads to a NULL pointer dereference, as shown in the following stack trace: KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590 Call Trace: <TASK> hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627 tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290 tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f To prevent this, ensure that the HCI_UART_REGISTERED flag is set before processing received data. If the protocol is not registered, return -EUNATCH.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 48effdb7a798232db945503cf3f51e0be8070cea , < 39a7d40314b6288cfa2d13269275e9247a7a055a (git)
Affected: 45fa7bd82c6178f4fec0ab94891144a043ec5fe8 , < 164586725b47f9d61912e6bf17dbaffeff11710b (git)
Affected: d71a57a34ab6bbc95dc461158403c02e8ff3f912 , < b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9 (git)
Affected: 9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf , < 8b892dbef3887dbe9afdc7176d1a5fd90e1636aa (git)
Affected: 806464634e7fc6b523160defeeddb1ade2a72f81 , < 799cd62cbcc3f12ee04b33ef390ff7d41c37d671 (git)
Affected: 6b7a32fa9bacdebd98c18b2a56994116995ee643 , < b420a4c7f915fc1c94ad1f6ca740acc046d94334 (git)
Affected: 366ceff495f902182d42b6f41525c2474caf3f9a , < 55c1519fca830f59a10bbf9aa8209c87b06cf7bc (git)
Affected: 366ceff495f902182d42b6f41525c2474caf3f9a , < ca94b2b036c22556c3a66f1b80f490882deef7a6 (git)
Affected: 15543b7bbe7b5f744fdbb44f75b14f81a0117813 (git)
Affected: a4b89a45b12b69bc82c8137346b150a118e02c26 (git)
Affected: 5.4.293 , < 5.4.302 (semver)
Affected: 5.10.237 , < 5.10.247 (semver)
Affected: 5.15.181 , < 5.15.197 (semver)
Affected: 6.1.135 , < 6.1.159 (semver)
Affected: 6.6.88 , < 6.6.117 (semver)
Affected: 6.12.24 , < 6.12.58 (semver)
Affected: 6.13.12 , < 6.14 (semver)
Affected: 6.14.3 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bcsp: receive data only if registered\n\nCurrently, bcsp_recv() can be called even when the BCSP protocol has not\nbeen registered. This leads to a NULL pointer dereference, as shown in\nthe following stack trace:\n\n    KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n    RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590\n    Call Trace:\n     \u003cTASK\u003e\n     hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627\n     tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290\n     tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706\n     vfs_ioctl fs/ioctl.c:51 [inline]\n     __do_sys_ioctl fs/ioctl.c:907 [inline]\n     __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n     do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n     entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nTo prevent this, ensure that the HCI_UART_REGISTERED flag is set before\nprocessing received data. If the protocol is not registered, return\n-EUNATCH."
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      "title": "Bluetooth: bcsp: receive data only if registered",
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bcsp: receive data only if registered\n\nCurrently, bcsp_recv() can be called even when the BCSP protocol has not\nbeen registered. This leads to a NULL pointer dereference, as shown in\nthe following stack trace:\n\n    KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n    RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590\n    Call Trace:\n     \u003cTASK\u003e\n     hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627\n     tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290\n     tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706\n     vfs_ioctl fs/ioctl.c:51 [inline]\n     __do_sys_ioctl fs/ioctl.c:907 [inline]\n     __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n     do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n     entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nTo prevent this, ensure that the HCI_UART_REGISTERED flag is set before\nprocessing received data. If the protocol is not registered, return\n-EUNATCH."
          }
        ],
        "id": "CVE-2025-40308",
        "lastModified": "2026-06-17T09:21:38.033",
        "metrics": {},
        "published": "2025-12-08T01:16:03.073",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T10:19:46+00:00",
      "cve": "CVE-2025-40308",
      "id": "CVE-2025-40308",
      "initial_release_date": "2025-12-08T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: bcsp: receive data only if registered",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40308.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

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.