CVE-2024-56591

Kernel memory corruption via requeued Bluetooth work

Published Dec 27, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel Bluetooth HCI connection handling in 3.3 through 6.12.4 allows adjacent attackers to corrupt kernel memory. The hci_conn_cleanup path cancels delayed work while freeing an hci_conn object but fails to prevent that work from being queued again against the released object. Bluetooth proximity is required, but the public record does not detail how the corruption is converted into data access or a system interruption.

CVSS severity8.8
High
EPSS probability0.28%
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 HCI connection handling in 3.3 through 6.12.4 allows adjacent attackers to corrupt kernel memory. The hci_conn_cleanup path cancels delayed work while freeing an hci_conn object but fails to prevent that work from being queued again against the released object. Bluetooth proximity is required, but the public record does not detail how the corruption is converted into data access or a system interruption.

The record

CVE
CVE-2024-56591
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 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=19c40e3bcaf2d969f5d4ee85bbe1330b54d36d9c <2b0f2fc9ed62e73c95df1fa8ed2ba3dac54699df
  2. Affected versionversion=19c40e3bcaf2d969f5d4ee85bbe1330b54d36d9c <c55a4c5a04bae40dcdc1e1c19d8eb79a06fb3397
  3. Affected versionversion=3.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=19c40e3bcaf2d969f5d4ee85bbe1330b54d36d9c <2b0f2fc9ed62e73c95df1fa8ed2ba3dac54699df; version=19c40e3bcaf2d969f5d4ee85bbe1330b54d36d9c <c55a4c5a04bae40dcdc1e1c19d8eb79a06fb3397; version=3.3

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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