CVE-2024-56639

Kernel crash via undersized RedBox supervision buffer

Published Dec 27, 2024 · Updated May 11, 2026

Out-of-bounds write in Linux kernel HSR RedBox support in 6.10 through 6.12.4 and 6.13-rc1 allows local users to crash the kernel. hsr_init_skb allocates only the base supervision-frame buffer, but send_hsr_supervision_frame appends two additional RedBox structures beyond that allocation. The flaw is reached when an HSR RedBox generates a supervision frame, and the resulting skb_over_panic interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux kernel HSR RedBox support in 6.10 through 6.12.4 and 6.13-rc1 allows local users to crash the kernel. hsr_init_skb allocates only the base supervision-frame buffer, but send_hsr_supervision_frame appends two additional RedBox structures beyond that allocation. The flaw is reached when an HSR RedBox generates a supervision frame, and the resulting skb_over_panic interrupts the host.

The record

CVE
CVE-2024-56639
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 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

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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=5055cccfc2d1cc1a7306f6bcdcd0ee9521d707f5 <688842f47ee9fb392d1c3a1ced1d21d505b14968
  2. Affected versionversion=5055cccfc2d1cc1a7306f6bcdcd0ee9521d707f5 <af8edaeddbc52e53207d859c912b017fd9a77629
  3. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5055cccfc2d1cc1a7306f6bcdcd0ee9521d707f5 <688842f47ee9fb392d1c3a1ced1d21d505b14968; version=5055cccfc2d1cc1a7306f6bcdcd0ee9521d707f5 <af8edaeddbc52e53207d859c912b017fd9a77629; version=6.10

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

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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