CVE-2024-26801

Kernel crash via Bluetooth device use-after-free

Published Apr 4, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel Bluetooth subsystem allows local users to crash the kernel during an unresponsive controller reset. HCI hardware-error handling invokes GPIO reset, which can release hci_dev while hci_error_reset is still using it because event processing does not hold a device reference. Reachability requires an HCI hardware-error event and an unresponsive Bluetooth controller; the bounded impact reported by Linux is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.42%
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 the Linux kernel Bluetooth subsystem allows local users to crash the kernel during an unresponsive controller reset. HCI hardware-error handling invokes GPIO reset, which can release hci_dev while hci_error_reset is still using it because event processing does not hold a device reference. Reachability requires an HCI hardware-error event and an unresponsive Bluetooth controller; the bounded impact reported by Linux is a kernel crash.

The record

CVE
CVE-2024-26801
Published
Apr 4, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 2024CVE 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=4.0
  2. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <2449007d3f73b2842c9734f45f0aadb522daf592
  3. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <2ab9a19d896f5a0dd386e1f001c5309bc35f433b
  4. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <45085686b9559bfbe3a4f41d3d695a520668f5e1
  5. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <6dd0a9dfa99f8990a08eb8fdd8e79bee31c7d8e2
  6. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <98fb98fd37e42fd4ce13ff657ea64503e24b6090
  7. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <da4569d450b193e39e87119fd316c0291b585d14
  8. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <dd594cdc24f2e48dab441732e6dfcafd6b0711d1
  9. Affected versionversion=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <e0b278650f07acf2e0932149183458468a731c03

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <2449007d3f73b2842c9734f45f0aadb522daf592; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <2ab9a19d896f5a0dd386e1f001c5309bc35f433b; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <45085686b9559bfbe3a4f41d3d695a520668f5e1; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <6dd0a9dfa99f8990a08eb8fdd8e79bee31c7d8e2; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <98fb98fd37e42fd4ce13ff657ea64503e24b6090; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <da4569d450b193e39e87119fd316c0291b585d14; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <dd594cdc24f2e48dab441732e6dfcafd6b0711d1; version=c7741d16a57cbf97eebe53f27e8216b1ff20e20c <e0b278650f07acf2e0932149183458468a731c03

Published CVSS scores

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-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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