CVE-2024-6564: Buffer overflow in "rcar_dev_init" due to using due to using untrusted data (rcar_image_number) as a loop cou

Routine

MEDIUM 6.7MITIGATE

CVE-2024-6564 is a medium-severity flaw (CVSS 6.7) affecting arm-trusted-firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in "rcar_dev_init" due to using due to using untrusted data (rcar_image_number) as a loop counter before verifying it against RCAR_MAX_BL3X_IMAGE. This could lead to a full bypass of secure boot.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-120
Published	2024-07-08
Last modified	2026-06-17

Publisher (CNA): Automotive Security Research Group (ASRG) · Vendor: renesas

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-07-08 16:15 UTCPublished CVE record published
2026-06-17 08:18 UTCUpdated Record last modified

renesas arm-trusted-firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-6564?

arm-trusted-firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-6564 being exploited?

CVE-2024-6564 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-6564 affect?

CVE-2024-6564 affects arm-trusted-firmware. Severity is medium (CVSS 6.7). Buffer overflow in "rcar_dev_init" due to using due to using untrusted data (rcar_image_number) as a loop counter before verifying it against RCAR_MAX_BL3X_IMAGE. This could lead to a full bypass of secure boot.

How urgent is CVE-2024-6564?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2024-6563 HIGH 7.5 MITIGATE Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in Renesas arm-trusted-fi
CVE-2024-1633 LOW 2.0 MITIGATE During the secure boot, bl2 (the second stage of the bootloader) loops over images defined in the table “bl2_m

References

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