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CVE-2025-40283· NVD / CVE Program· CNA Linux

Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1c28c1e1522c773a94e26950ffb145e88cd9834b, 23d22f2f71768034d6ef86168213843fc49bf550, 297dbf87989e09af98f81f2bcb938041785557e8.

Low priority for now. Upgrade to Linux Linux 1c28c1e1522c773a94e26950ffb145e88cd9834b, 23d22f2f71768034d6ef86168213843fc49bf550, 297dbf87989e09af98f81f2bcb938041785557e8 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: btusb: reorder cleanup in btusb_disconnect to avoid UAF There is a KASAN: slab-use-after-free read in btusb_disconnect(). Calling "usb_driver_release_interface(&btusb_driver, data->intf)" will free the btusb data associated with the interface. The same data is then used later in the function, hence the UAF. Fix by moving the accesses to btusb data to before the data is free'd.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Dec 6, 2025
Updated
Oct 15, 2026
EPSS
0.1% · 3th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2025-40283

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

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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.

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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

    • 4.11affected
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before 297dbf87989e09af98f81f2bcb938041785557e8affected · git
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before f858f004bc343a7ae9f2533bbb2a3ab27428532faffected · git
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before 7a6d1e740220ff9dfcb6a8c994d6ba49e76db198affected · git
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before 5dc00065a0496c36694afe11e52a5bc64524a9b8affected · git
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before 1c28c1e1522c773a94e26950ffb145e88cd9834baffected · git
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before 95b9b98c93b1c0916a3d4cf4540b7f5d69145a0daffected · git
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before a2610ecd9fd5708be8997ca8f033e4200c0bb6afaffected · git
    • fd913ef7ce619467c6b0644af48ba1fec499c623 and later · before 23d22f2f71768034d6ef86168213843fc49bf550affected · git
    • before 4.11not affected · 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 6.17.9-16.17.9-1

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-2025-40281Dec 6, 2025 · sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto
    0Monitor
  • ← EarlierCVE-2025-40282Dec 6, 2025 · Bluetooth: 6lowpan: reset link-local header on ipv6 recv path
    35Monitor
  • Later →CVE-2025-40284Dec 6, 2025 · Bluetooth: MGMT: cancel mesh send timer when hdev removed
    31Monitor

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 Linux1c28c1e1522c773a94e26950ffb145e88cd9834bVendor (CNA)
Linux Linux23d22f2f71768034d6ef86168213843fc49bf550Vendor (CNA)
Linux Linux297dbf87989e09af98f81f2bcb938041785557e8Vendor (CNA)
Linux Linux5dc00065a0496c36694afe11e52a5bc64524a9b8Vendor (CNA)
Linux Linux7a6d1e740220ff9dfcb6a8c994d6ba49e76db198Vendor (CNA)
Linux Linux95b9b98c93b1c0916a3d4cf4540b7f5d69145a0dVendor (CNA)
Linux Linuxa2610ecd9fd5708be8997ca8f033e4200c0bb6afVendor (CNA)
Linux Linuxf858f004bc343a7ae9f2533bbb2a3ab27428532fVendor (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.

EPSS, last 120 days

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 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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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. SSVC exploitation— → none
  2. 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