{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40308","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.185Z","datePublished":"2025-12-08T00:46:33.729Z","dateUpdated":"2026-05-11T21:46:50.565Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:46:50.565Z"},"descriptions":[{"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     <TASK>\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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/hci_bcsp.c"],"versions":[{"version":"48effdb7a798232db945503cf3f51e0be8070cea","lessThan":"39a7d40314b6288cfa2d13269275e9247a7a055a","status":"affected","versionType":"git"},{"version":"45fa7bd82c6178f4fec0ab94891144a043ec5fe8","lessThan":"164586725b47f9d61912e6bf17dbaffeff11710b","status":"affected","versionType":"git"},{"version":"d71a57a34ab6bbc95dc461158403c02e8ff3f912","lessThan":"b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9","status":"affected","versionType":"git"},{"version":"9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf","lessThan":"8b892dbef3887dbe9afdc7176d1a5fd90e1636aa","status":"affected","versionType":"git"},{"version":"806464634e7fc6b523160defeeddb1ade2a72f81","lessThan":"799cd62cbcc3f12ee04b33ef390ff7d41c37d671","status":"affected","versionType":"git"},{"version":"6b7a32fa9bacdebd98c18b2a56994116995ee643","lessThan":"b420a4c7f915fc1c94ad1f6ca740acc046d94334","status":"affected","versionType":"git"},{"version":"366ceff495f902182d42b6f41525c2474caf3f9a","lessThan":"55c1519fca830f59a10bbf9aa8209c87b06cf7bc","status":"affected","versionType":"git"},{"version":"366ceff495f902182d42b6f41525c2474caf3f9a","lessThan":"ca94b2b036c22556c3a66f1b80f490882deef7a6","status":"affected","versionType":"git"},{"version":"15543b7bbe7b5f744fdbb44f75b14f81a0117813","status":"affected","versionType":"git"},{"version":"a4b89a45b12b69bc82c8137346b150a118e02c26","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/hci_bcsp.c"],"versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"5.4.302","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.247","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.197","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.159","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.117","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.58","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.17.8","lessThanOrEqual":"6.17.*","status":"unaffected","versionType":"semver"},{"version":"6.18","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.293","versionEndExcluding":"5.4.302"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.237","versionEndExcluding":"5.10.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.181","versionEndExcluding":"5.15.197"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.135","versionEndExcluding":"6.1.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.88","versionEndExcluding":"6.6.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.24","versionEndExcluding":"6.12.58"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.17.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a"},{"url":"https://git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b"},{"url":"https://git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9"},{"url":"https://git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa"},{"url":"https://git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671"},{"url":"https://git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334"},{"url":"https://git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc"},{"url":"https://git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6"}],"title":"Bluetooth: bcsp: receive data only if registered","x_generator":{"engine":"bippy-1.2.0"}}}}