CVE-2025-40308Bluetooth: bcsp: receive data only if registered
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 8 months later
· 8 months later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 48effdb7a798232db945503cf3f51e0be8070cea – < 39a7d40314b6288cfa2d13269275e9247a7a055a
- affected 45fa7bd82c6178f4fec0ab94891144a043ec5fe8 – < 164586725b47f9d61912e6bf17dbaffeff11710b
- affected d71a57a34ab6bbc95dc461158403c02e8ff3f912 – < b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9
- affected 9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf – < 8b892dbef3887dbe9afdc7176d1a5fd90e1636aa
- affected 806464634e7fc6b523160defeeddb1ade2a72f81 – < 799cd62cbcc3f12ee04b33ef390ff7d41c37d671
- affected 6b7a32fa9bacdebd98c18b2a56994116995ee643 – < b420a4c7f915fc1c94ad1f6ca740acc046d94334
- affected 366ceff495f902182d42b6f41525c2474caf3f9a – < 55c1519fca830f59a10bbf9aa8209c87b06cf7bc
- affected 366ceff495f902182d42b6f41525c2474caf3f9a – < ca94b2b036c22556c3a66f1b80f490882deef7a6
- affected 15543b7bbe7b5f744fdbb44f75b14f81a0117813
- affected a4b89a45b12b69bc82c8137346b150a118e02c26
- affected 5.4.293 – < 5.4.302
- affected 5.10.237 – < 5.10.247
- affected 5.15.181 – < 5.15.197
- affected 6.1.135 – < 6.1.159
- affected 6.6.88 – < 6.6.117
- affected 6.12.24 – < 6.12.58
- affected 6.13.12 – < 6.14
- affected 6.14.3 – < 6.15
- affected 6.15
- unaffected < 6.15
- unaffected 5.4.302 – ≤ 5.4.*
- unaffected 5.10.247 – ≤ 5.10.*
- unaffected 5.15.197 – ≤ 5.15.*
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.117 – ≤ 6.6.*
- unaffected 6.12.58 – ≤ 6.12.*
- unaffected 6.17.8 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References8
- https://git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a (opens in a new tab)
- https://git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b (opens in a new tab)
- https://git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9 (opens in a new tab)
- https://git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa (opens in a new tab)
- https://git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671 (opens in a new tab)
- https://git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334 (opens in a new tab)
- https://git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc (opens in a new tab)
- https://git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-201637 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40308)Record last updated .