CVE-2025-40308
Vulnerability Scoring
Analysis In Progress
CVE-2025-40308 Vulnerability Analysis & Exploit Details
CVE-2025-40308
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2025-40308 Details
Status: Awaiting Analysis
Published on: 08 Dec 2025, 01:16 UTC
CVSS Release:
CVE-2025-40308 Vulnerability Summary
CVE-2025-40308: 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.
Assessing the Risk of CVE-2025-40308
Access Complexity Graph
The exploitability of CVE-2025-40308 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2025-40308
No exploitability data is available for CVE-2025-40308.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2025-40308, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2025-40308, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2025-40308 does not compromise confidentiality.
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Integrity:
None
CVE-2025-40308 does not impact data integrity.
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Availability:
None
CVE-2025-40308 does not affect system availability.
CVE-2025-40308 References
External References
- https://git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b
- https://git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a
- https://git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc
- https://git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671
- https://git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa
- https://git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334
- https://git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9
- https://git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6
CWE Common Weakness Enumeration
Unknown
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