CVE-2024-21803

Local code execution via Bluetooth socket race

Published Jan 30, 2024 · Updated May 29, 2025

Use-after-free in Linux kernel Bluetooth code before 6.8-rc1 allows local users to execute code during Bluetooth pairing. bt_sock_poll passes a listening socket pointer to bt_accept_poll, which traverses accept_q after another task frees the socket. Triggering requires Bluetooth pairing and winning a nondeterministic concurrent race; the stale-pointer access can crash the kernel or enable code execution.

CVSS severity3.5
Low
EPSS probability0.50%
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 code before 6.8-rc1 allows local users to execute code during Bluetooth pairing. bt_sock_poll passes a listening socket pointer to bt_accept_poll, which traverses accept_q after another task frees the socket. Triggering requires Bluetooth pairing and winning a nondeterministic concurrent race; the stale-pointer access can crash the kernel or enable code execution.

The record

CVE
CVE-2024-21803
Published
Jan 30, 2024
Updated
May 29, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 30, 2024CVE publishedPublication date reported by the CVE source.
  2. May 29, 2025Record 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=v2.6.12-rc2 <v6.8-rc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=v2.6.12-rc2 <v6.8-rc1

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.5OpenAnolisCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L

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

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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