Bluetooth: bcsp: receive data only if registered
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.
- Published
- Dec 7, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 8th percentile
- CWE
- —
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Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Noroxi analysis
No Noroxi analysis for this record yet
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We use this product, ask for helpAffected systems
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Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 15543b7bbe7b5f744fdbb44f75b14f81a0117813, a4b89a45b12b69bc82c8137346b150a118e02c26, 6.15affected
- 48effdb7a798232db945503cf3f51e0be8070cea and later · before 39a7d40314b6288cfa2d13269275e9247a7a055aaffected · git
- 45fa7bd82c6178f4fec0ab94891144a043ec5fe8 and later · before 164586725b47f9d61912e6bf17dbaffeff11710baffected · git
- d71a57a34ab6bbc95dc461158403c02e8ff3f912 and later · before b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9affected · git
- 9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf and later · before 8b892dbef3887dbe9afdc7176d1a5fd90e1636aaaffected · git
- 806464634e7fc6b523160defeeddb1ade2a72f81 and later · before 799cd62cbcc3f12ee04b33ef390ff7d41c37d671affected · git
- 6b7a32fa9bacdebd98c18b2a56994116995ee643 and later · before b420a4c7f915fc1c94ad1f6ca740acc046d94334affected · git
- 366ceff495f902182d42b6f41525c2474caf3f9a and later · before 55c1519fca830f59a10bbf9aa8209c87b06cf7bcaffected · git
- 366ceff495f902182d42b6f41525c2474caf3f9a and later · before ca94b2b036c22556c3a66f1b80f490882deef7a6affected · git
- 5.4.293 and later · before 5.4.302affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.159-1 | 6.1.159-1 |
| Debian:13 | linux | before 6.12.63-1 | 6.12.63-1 |
| Debian:14 | linux | before 6.17.8-1 | 6.17.8-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 164586725b47f9d61912e6bf17dbaffeff11710b | Vendor (CNA) |
| Linux Linux | 39a7d40314b6288cfa2d13269275e9247a7a055a | Vendor (CNA) |
| Linux Linux | 5.10.247 | Vendor (CNA) |
| Linux Linux | 5.15.197 | Vendor (CNA) |
| Linux Linux | 5.4.302 | Vendor (CNA) |
| Linux Linux | 55c1519fca830f59a10bbf9aa8209c87b06cf7bc | Vendor (CNA) |
| Linux Linux | 6.1.159 | Vendor (CNA) |
| Linux Linux | 6.12.58 | Vendor (CNA) |
| Linux Linux | 6.14 | Vendor (CNA) |
| Linux Linux | 6.15 | Vendor (CNA) |
| Linux Linux | 6.6.117 | Vendor (CNA) |
| Linux Linux | 799cd62cbcc3f12ee04b33ef390ff7d41c37d671 | Vendor (CNA) |
| Linux Linux | 8b892dbef3887dbe9afdc7176d1a5fd90e1636aa | Vendor (CNA) |
| Linux Linux | b420a4c7f915fc1c94ad1f6ca740acc046d94334 | Vendor (CNA) |
| Linux Linux | b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9 | Vendor (CNA) |
| Linux Linux | ca94b2b036c22556c3a66f1b80f490882deef7a6 | Vendor (CNA) |
| debian:linux | 6.1.159-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
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Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
No CVSS vector for this record, so attack conditions can't be derived.
Weakness class (CWE)
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Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b
- git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a
- git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc
- git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671
- git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa
- git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334
- git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9
- git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6
Vendor advisories and official records. Exploit/PoC links are deliberately left out.