CVE-2024-56590

Bluetooth disruption via truncated ACL frames

Published Dec 27, 2024 · Updated Aug 5, 2026

Out-of-bounds read in the Linux kernel Bluetooth HCI core allows physically proximate attackers to disrupt connections via short ACL frames. hci_acldata_packet reads ACL header fields before verifying that the socket buffer contains the four-byte header, allowing an undersized frame to supply invalid handle and flag data. An active Bluetooth receive path is required; repeated frames can corrupt reassembly state, tear down unrelated links, and cause a fatal kernel failure on hardened builds.

CVSS severity7.6
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel Bluetooth HCI core allows physically proximate attackers to disrupt connections via short ACL frames. hci_acldata_packet reads ACL header fields before verifying that the socket buffer contains the four-byte header, allowing an undersized frame to supply invalid handle and flag data. An active Bluetooth receive path is required; repeated frames can corrupt reassembly state, tear down unrelated links, and cause a fatal kernel failure on hardened builds.

The record

CVE
CVE-2024-56590
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120, T1499
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <219960a48771b35a3857a491b955c31d6c33d581
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3fe288a8214e7dd784d1f9b7c9e448244d316b47
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <559b1c7ac2e212a23b3833d3baf3bd957771d02e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5e50d12cc6e95e1fde08f5db6992b616f714b0fb
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93a6160dc198ffe5786da8bd8588cfd17f53b29a
  6. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <219960a48771b35a3857a491b955c31d6c33d581; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3fe288a8214e7dd784d1f9b7c9e448244d316b47; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <559b1c7ac2e212a23b3833d3baf3bd957771d02e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5e50d12cc6e95e1fde08f5db6992b616f714b0fb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93a6160dc198ffe5786da8bd8588cfd17f53b29a; version=2.6.12

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.6Linux kernel CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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