CVE-2024-36309: AMD Northbridge IO missing lock bit protection in remapping

CVE-2024-36309 · Severity: info · Published 2026-11-10

AMD processors contain a missing lock bit protection mechanism in the Northbridge IO (NBIO) component that could allow a privileged attacker to re-map device memory access. An attacker with elevated privileges could use this to bypass security controls and potentially expose, modify, or disrupt data on systems using affected AMD processors.

Vendors: Amd.

Quick answers

Is CVE-2024-36309 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2024-36309 being exploited in the wild.
How severe is CVE-2024-36309?
Informational severity, published 10 November 2026.
Which products and versions are affected?
AMD Northbridge IO.
Is there a fix for CVE-2024-36309?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2024-36309 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2024-36309?
Check whether you run Amd Northbridge IO. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The NBIO lacks proper lock bit protection, allowing a privileged attacker to re-enable intentionally disabled devices through a remapping attack. This is a hardware-level vulnerability affecting memory access controls. Exploitation requires privileged access and could impact data confidentiality, integrity, or availability depending on the device being remapped.

Affected products

  • AMD Northbridge IO

Timeline

  • 2026-11-10: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.