CVE-2024-36011

Kernel crash via unchecked Bluetooth connection lookup

Published May 23, 2024 · Updated May 23, 2026

NULL pointer dereference in affected Linux kernel releases allows local users to crash systems through a Bluetooth HCI event. In hci_le_big_sync_established_evt(), a failed hci_conn_add() can leave no BIS connection, but a later hci_conn_hash_lookup_handle() result is dereferenced without a null check. Exploitation requires local low-privileged access and the failure path for a Bluetooth isochronous broadcast connection; the published impact is a kernel crash only.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux kernel releases allows local users to crash systems through a Bluetooth HCI event. In hci_le_big_sync_established_evt(), a failed hci_conn_add() can leave no BIS connection, but a later hci_conn_hash_lookup_handle() result is dereferenced without a null check. Exploitation requires local low-privileged access and the failure path for a Bluetooth isochronous broadcast connection; the published impact is a kernel crash only.

The record

CVE
CVE-2024-36011
Published
May 23, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 23, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.4.16 <6.5
  2. Affected versionversion=6.5.3 <6.6
  3. Affected versionversion=6.6
  4. Affected versionversion=970aaee1d264ff8b6907005f47b8724ad45f1e48
  5. Affected versionversion=993fffbcc6164a9b9b6446f21f3caa649e3c7346
  6. Affected versionversion=f777d88278170410b06a1f6633f3b9375a4ddd6b <1f7ebb69c1d65732bcac2fda9d15421f76f01e81
  7. Affected versionversion=f777d88278170410b06a1f6633f3b9375a4ddd6b <9f3be61f55d4eedc20eedc56c0f04a5ce2b4a55a
  8. Affected versionversion=f777d88278170410b06a1f6633f3b9375a4ddd6b <d2706004a1b8b526592e823d7e52551b518a7941

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4.16 <6.5; version=6.5.3 <6.6; version=6.6; version=970aaee1d264ff8b6907005f47b8724ad45f1e48; version=993fffbcc6164a9b9b6446f21f3caa649e3c7346; version=f777d88278170410b06a1f6633f3b9375a4ddd6b <1f7ebb69c1d65732bcac2fda9d15421f76f01e81; version=f777d88278170410b06a1f6633f3b9375a4ddd6b <9f3be61f55d4eedc20eedc56c0f04a5ce2b4a55a; version=f777d88278170410b06a1f6633f3b9375a4ddd6b <d2706004a1b8b526592e823d7e52551b518a7941
The Linux Kernel Organization · Linux Kernelversion=6.6; version=f777d8827817 <1f7ebb69c1d6; version=f777d8827817 <9f3be61f55d4; version=f777d8827817 <d2706004a1b8

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/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-476NULL 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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