dbcve.org
Arm Trusted FirmwareOperating system · Renesas

CVE-2024-6564

MEDIUM · 6.7 CVSS v3.1 Published 2024-07-08
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
69/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-120

A fixed-size buffer is filled without checking the length of the incoming data, so it overflows into neighbouring memory. This is the classic overflow attackers use to overwrite return addresses and hijack execution. The fix is strict length checks and safe, bounded string and memory functions.

General guidance for the classic buffer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Arm Trusted FirmwareOperating system
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Apply vendor patch c9fb3558410032d2660c7f3b7d4b87dec09fe2f2 to the renesas-rcar/arm-trusted-firmware fork

  1. 1. Navigate to the Renesas R-Car ARM Trusted Firmware repository: https://github.com/renesas-rcar/arm-trusted-firmware
  2. 2. Locate and review the specific patch commit: c9fb3558410032d2660c7f3b7d4b87dec09fe2f2
  3. 3. Examine the code changes in the commit to understand the buffer overflow fix in rcar_dev_init
  4. 4. Apply the patch to your local copy of the repository using: git cherry-pick c9fb3558410032d2660c7f3b7d4b87dec09fe2f2
  5. 5. Verify the patch applies cleanly without conflicts
  6. 6. Rebuild the ARM Trusted Firmware with the fix applied
  7. 7. Re-sign the firmware with your secure boot keys if required
  8. 8. Update the firmware on the affected Renesas R-Car device

Generated from the published advisory — verify against the referenced sources before acting.

We can apply and verify the patch for your build — typical engagement from $2,850. Get the patch applied

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-6564 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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