Skip to content
Noroxi
NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 164586725b47f9d61912e6bf17dbaffeff11710b, 39a7d40314b6288cfa2d13269275e9247a7a055a, 5.10.247.

Low priority for now. Upgrade to Linux Linux 164586725b47f9d61912e6bf17dbaffeff11710b, 39a7d40314b6288cfa2d13269275e9247a7a055a, 5.10.247 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Dec 8, 2025
Updated
Oct 14, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-40308

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

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.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.8-16.17.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40306Dec 8, 2025 · orangefs: fix xattr related buffer overflow...
    31Monitor
  • ← EarlierCVE-2025-40307Dec 8, 2025 · exfat: validate cluster allocation bits of the allocation bitmap
    31Monitor
  • Later →CVE-2025-40309Dec 8, 2025 · Bluetooth: SCO: Fix UAF on sco_conn_free
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux164586725b47f9d61912e6bf17dbaffeff11710bVendor (CNA)
Linux Linux39a7d40314b6288cfa2d13269275e9247a7a055aVendor (CNA)
Linux Linux5.10.247Vendor (CNA)
Linux Linux5.15.197Vendor (CNA)
Linux Linux5.4.302Vendor (CNA)
Linux Linux55c1519fca830f59a10bbf9aa8209c87b06cf7bcVendor (CNA)
Linux Linux6.1.159Vendor (CNA)
Linux Linux6.12.58Vendor (CNA)
Linux Linux6.14Vendor (CNA)
Linux Linux6.15Vendor (CNA)
Linux Linux6.6.117Vendor (CNA)
Linux Linux799cd62cbcc3f12ee04b33ef390ff7d41c37d671Vendor (CNA)
Linux Linux8b892dbef3887dbe9afdc7176d1a5fd90e1636aaVendor (CNA)
Linux Linuxb420a4c7f915fc1c94ad1f6ca740acc046d94334Vendor (CNA)
Linux Linuxb65ca9708bfbf47d8b7bd44b7c574bd16798e9c9Vendor (CNA)
Linux Linuxca94b2b036c22556c3a66f1b80f490882deef7a6Vendor (CNA)
debian:linux6.1.159-1 · Debian:12Package 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.

No history yet (it accumulates with the daily EPSS job).

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 researchers

Finders, 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.

—

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)

—

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

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records