CVE-2025-40282

Kernel panic via unset MAC header offset

Published Dec 6, 2025 · Updated Aug 5, 2026

Improper packet-header handling in Linux allows physically proximate attackers to trigger a kernel panic via a Bluetooth LE frame. The uncompressed IPv6 branch in net/bluetooth/6lowpan.c forwards a received skb without resetting its MAC header, leaving an invalid offset for later packet consumers. An unauthenticated peer within Bluetooth LE range can select that branch with a 0x41 dispatch byte, causing out-of-bounds access and a fatal BUG in interrupt context.

CVSS severity8.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper packet-header handling in Linux allows physically proximate attackers to trigger a kernel panic via a Bluetooth LE frame. The uncompressed IPv6 branch in net/bluetooth/6lowpan.c forwards a received skb without resetting its MAC header, leaving an invalid offset for later packet consumers. An unauthenticated peer within Bluetooth LE range can select that branch with a 0x41 dispatch byte, causing out-of-bounds access and a fatal BUG in interrupt context.

The record

CVE
CVE-2025-40282
Published
Dec 6, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <11cd7e068381666f842ad41d1cc58eecd0c75237
  2. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <3b78f50918276ab28fb22eac9aa49401ac436a3b
  3. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <4ebb90c3c309e6375dc3e841af92e2a039843e62
  4. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <70d84e7c3a44b81020a3c3d650a64c63593405bd
  5. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <973e0271754c77db3e1b6b69adf2de85a79a4c8b
  6. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <c24ac6cfe4f9a47180a65592c47e7a310d2f9d93
  7. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <d566e9a2bfc848941b091ffd5f4e12c4e889d818
  8. Affected versionversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <ea46a1d217bc82e01cf3d0424e50ebfe251e34bf
  9. Affected versionversion=3.14

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=18722c247023035b9e2e2a08a887adec2a9a6e49 <11cd7e068381666f842ad41d1cc58eecd0c75237; version=18722c247023035b9e2e2a08a887adec2a9a6e49 <3b78f50918276ab28fb22eac9aa49401ac436a3b; version=18722c247023035b9e2e2a08a887adec2a9a6e49 <4ebb90c3c309e6375dc3e841af92e2a039843e62; version=18722c247023035b9e2e2a08a887adec2a9a6e49 <70d84e7c3a44b81020a3c3d650a64c63593405bd; version=18722c247023035b9e2e2a08a887adec2a9a6e49 <973e0271754c77db3e1b6b69adf2de85a79a4c8b; version=18722c247023035b9e2e2a08a887adec2a9a6e49 <c24ac6cfe4f9a47180a65592c47e7a310d2f9d93; version=18722c247023035b9e2e2a08a887adec2a9a6e49 <d566e9a2bfc848941b091ffd5f4e12c4e889d818; version=18722c247023035b9e2e2a08a887adec2a9a6e49 <ea46a1d217bc82e01cf3d0424e50ebfe251e34bf; version=3.14

Published CVSS scores

8.8Linux kernel CVE teamCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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