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CVE-2025-40308— Bluetooth: bcsp: receive data only if registered

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未注册状态下接收数据，可能导致空指针取消引用。

AI Predicted 6.6 Difficulty: Moderate EPSS 0.19% · P9

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux 48effdb7a798232db945503cf3f51e0be8070cea< 39a7d40314b6288cfa2d13269275e9247a7a055a affected
45fa7bd82c6178f4fec0ab94891144a043ec5fe8< 164586725b47f9d61912e6bf17dbaffeff11710b affected
d71a57a34ab6bbc95dc461158403c02e8ff3f912< b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9 affected
9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf< 8b892dbef3887dbe9afdc7176d1a5fd90e1636aa affected
806464634e7fc6b523160defeeddb1ade2a72f81< 799cd62cbcc3f12ee04b33ef390ff7d41c37d671 affected
6b7a32fa9bacdebd98c18b2a56994116995ee643< b420a4c7f915fc1c94ad1f6ca740acc046d94334 affected
366ceff495f902182d42b6f41525c2474caf3f9a< 55c1519fca830f59a10bbf9aa8209c87b06cf7bc affected
366ceff495f902182d42b6f41525c2474caf3f9a< ca94b2b036c22556c3a66f1b80f490882deef7a6 affected
… +20 more rows
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I. Basic Information for CVE-2025-40308

Vulnerability Information
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Vulnerability Title
Bluetooth: bcsp: receive data only if registered
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未注册状态下接收数据，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 48effdb7a798232db945503cf3f51e0be8070cea ~ 39a7d40314b6288cfa2d13269275e9247a7a055a -
Linux Linux 6.15 -

II. Public POCs for CVE-2025-40308

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III. Intelligence Information for CVE-2025-40308

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Same Patch Batch · Linux · 2025-12-08 · 82 CVEs total

CVE-2023-53751 9.8 CRITICAL cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname
CVE-2025-40320 9.8 CRITICAL smb: client: fix potential cfid UAF in smb2_query_info_compound
CVE-2023-53769 9.3 CRITICAL virt/coco/sev-guest: Double-buffer messages
CVE-2023-53764 8.8 HIGH wifi: ath12k: Handle lock during peer_id find
CVE-2023-53762 8.8 HIGH Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync
CVE-2025-40318 8.8 HIGH Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
CVE-2025-40292 8.4 HIGH virtio-net: fix received length check in big packets
CVE-2025-40309 8.0 HIGH Bluetooth: SCO: Fix UAF on sco_conn_free
CVE-2025-40297 7.8 HIGH net: bridge: fix use-after-free due to MST port state bypass
CVE-2025-40317 7.8 HIGH regmap: slimbus: fix bus_context pointer in regmap init calls
CVE-2025-40302 7.8 HIGH media: videobuf2: forbid remove_bufs when legacy fileio is active
CVE-2023-53763 7.8 HIGH Revert "f2fs: fix to do sanity check on extent cache correctly"
CVE-2023-53759 7.8 HIGH HID: hidraw: fix data race on device refcount
CVE-2025-40319 7.8 HIGH bpf: Sync pending IRQ work before freeing ring buffer
CVE-2025-40323 7.8 HIGH fbcon: Set fb_display[i]->mode to NULL when the mode is released
CVE-2023-53753 7.8 HIGH drm/amd/display: fix mapping to non-allocated address
CVE-2023-53752 7.8 HIGH net: deal with integer overflows in kmalloc_reserve()
CVE-2023-53747 7.8 HIGH vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF
CVE-2022-50623 7.8 HIGH fpga: prevent integer overflow in dfl_feature_ioctl_set_irq()
CVE-2022-50630 7.8 HIGH mm: hugetlb: fix UAF in hugetlb_handle_userfault

Showing top 20 of 82 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40308

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