CVE-2026-72336

Kernel crash via 6LoWPAN connection lifetime race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel Bluetooth 6LoWPAN allows local users to crash the system through a debugfs control-write race. The get_l2cap_conn() path releases hdev protection without retaining the L2CAP connection, so lowpan_control_write() can dereference conn->hcon after teardown. Local low-privilege access to the 6LoWPAN debugfs control plus a concurrent Bluetooth disconnect or device close is required; the confirmed consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel Bluetooth 6LoWPAN allows local users to crash the system through a debugfs control-write race. The get_l2cap_conn() path releases hdev protection without retaining the L2CAP connection, so lowpan_control_write() can dereference conn->hcon after teardown. Local low-privilege access to the 6LoWPAN debugfs control plus a concurrent Bluetooth disconnect or device close is required; the confirmed consequence is a kernel crash.

The record

CVE
CVE-2026-72336
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=3.17
  2. Affected versionversion=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <23a83bac3356e7b211bcdcf581a31f7b536a2c24
  3. Affected versionversion=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <32c48c7f6cc8c7888e46a8c81622154ccafda5d2
  4. Affected versionversion=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <518aa9505fa10ea5662349e5d2efd8c9e32a820b
  5. Affected versionversion=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <ba1f1ef6522e63aa5dd29805b4390ea2ccadf05e
  6. Affected versionversion=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <d2a8dc1f619c9e0e4126bee795c39ebddd2ec8ff

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <23a83bac3356e7b211bcdcf581a31f7b536a2c24; version=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <32c48c7f6cc8c7888e46a8c81622154ccafda5d2; version=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <518aa9505fa10ea5662349e5d2efd8c9e32a820b; version=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <ba1f1ef6522e63aa5dd29805b4390ea2ccadf05e; version=6b8d4a6a03144c5996f98db7f8256267b0d72a3a <d2a8dc1f619c9e0e4126bee795c39ebddd2ec8ff

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
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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