Bluetooth: bcsp: receive data only if registered
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.4.293 to before 5.4.302; 5.10.237 to before 5.10.247; 5.15.181 to before 5.15.197; 6.1.135 to before 6.1.159; 6.6.88 to before 6.6.117; 6.12.24 to before 6.12.58; 6.13.12 to before 6.14; 6.14.3 to before 6.15 | 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.14, 6.15 | Patch available | CNA |
| Linux | Linux | 6.15 and later | 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18 | Patch available | CNA |
- Linux VendorLinux Affected 5.4.293 to before 5.4.302; 5.10.237 to before 5.10.247; 5.15.181 to before 5.15.197; 6.1.135 to before 6.1.159; 6.6.88 to before 6.6.117; 6.12.24 to before 6.12.58; 6.13.12 to before 6.14; 6.14.3 to before 6.15 Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.14, 6.15 Patch available CNA
- Linux VendorLinux Affected 6.15 and later Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.14, 6.15
- Fix · CNA Linux (Linux) Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-40308
- 2026-10-03 Alias added: GHSA-4r3x-4wj9-mxfm
References
Other 8
- https://git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a
- https://git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b
- https://git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9
- https://git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa
- https://git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671
- https://git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334
- https://git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc
- https://git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6
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Sources
- CVE-2025-40308 · CVE Program
- CVE-2025-40308 · NVD
- FIRST EPSS
- GHSA-4r3x-4wj9-mxfm · GitHub Advisory Database · CC BY 4.0
- CVE-2025-40308 · Red Hat security data · CC BY 4.0
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