CVE-2024-46749

Kernel crash via unchecked NULL skb free

Published Sep 18, 2024 · Updated May 11, 2026

Denial of service in the Linux btnxpuart Bluetooth driver from 6.4 allows local users to crash the kernel during driver teardown. The flush and close paths pass rx->skb to the skb-freeing routine without first checking whether firmware-download failure left that pointer NULL. Reachability requires the btnxpuart driver and compatible Bluetooth hardware, plus driver removal after firmware download fails or before it completes.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux btnxpuart Bluetooth driver from 6.4 allows local users to crash the kernel during driver teardown. The flush and close paths pass rx->skb to the skb-freeing routine without first checking whether firmware-download failure left that pointer NULL. Reachability requires the btnxpuart driver and compatible Bluetooth hardware, plus driver removal after firmware download fails or before it completes.

The record

CVE
CVE-2024-46749
Published
Sep 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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
  2. Affected versionversion=ab3a769b4dccec2cf60f0a0700b140991bf9afc8 <013dae4735d2010544d1f2121bdeb8e6c9ea171e
  3. Affected versionversion=ab3a769b4dccec2cf60f0a0700b140991bf9afc8 <056e0cd381d59a9124b7c43dd715e15f56a11635
  4. Affected versionversion=ab3a769b4dccec2cf60f0a0700b140991bf9afc8 <c68bbf5e334b35b36ac5b9f0419f1f93f796bad1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=ab3a769b4dccec2cf60f0a0700b140991bf9afc8 <013dae4735d2010544d1f2121bdeb8e6c9ea171e; version=ab3a769b4dccec2cf60f0a0700b140991bf9afc8 <056e0cd381d59a9124b7c43dd715e15f56a11635; version=ab3a769b4dccec2cf60f0a0700b140991bf9afc8 <c68bbf5e334b35b36ac5b9f0419f1f93f796bad1

Published CVSS scores

5.5NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499Endpoint Denial of Service

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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