CVE-2024-6564

Secure boot bypass via unchecked image count

Published Jul 8, 2024 · Updated Aug 1, 2024

Buffer overflow in Renesas R-Car Gen3 Trusted Firmware-A allows local users to bypass secure boot via a crafted firmware header. In rcar_dev_init, rcar_image_number from header[0] controls copies into two image-header arrays before its maximum is checked. Reaching the flaw requires privileged local control of the boot firmware package, and successful exploitation bypasses its signature-enforcement boundary.

CVSS severity6.7
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Renesas R-Car Gen3 Trusted Firmware-A allows local users to bypass secure boot via a crafted firmware header. In rcar_dev_init, rcar_image_number from header[0] controls copies into two image-header arrays before its maximum is checked. Reaching the flaw requires privileged local control of the boot firmware package, and successful exploitation bypasses its signature-enforcement boundary.

The record

CVE
CVE-2024-6564
Published
Jul 8, 2024
Updated
Aug 1, 2024
Vendor
Renesas Electronics
Product
R-Car Gen3
Classifications
CWE-120, T1542.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record 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=c2f286820471ed276c57e603762bd831873e5a17 <=c9fb3558410032d2660c7f3b7d4b87dec09fe2f2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Renesas Electronics · R-Car Gen3version=c2f286820471ed276c57e603762bd831873e5a17 <=c9fb3558410032d2660c7f3b7d4b87dec09fe2f2

Published CVSS scores

6.7Automotive Security Research Group (ASRG)CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1542.001System Firmware

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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