# CVE-2023-40540: Information disclosure in Intel(R) NUC BIOS firmware

> A privileged local attacker can exploit non-transparent microarchitectural resource sharing in Intel NUC BIOS to disclose sensitive information.

- **Severity:** Medium 4.1 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Nov 2023
- **Updated:** 30 Aug 2024
- **Also known as:** GHSA-2gmf-mp9h-g5xw

## What is CVE-2023-40540?

CVE-2023-40540 is a medium-severity vulnerability in Intel(R) NUC BIOS firmware, published on 14 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Non-Transparent Sharing of Microarchitectural Resources in some Intel(R) NUC BIOS firmware may allow a privileged user to potentially enable information disclosure via local access.

Weakness: CWE-1303 (Non-Transparent Sharing of Microarchitectural Resources)

## Which versions are affected by CVE-2023-40540?

It affects 56 products.


Products: Intel Nuc 11 Enthusiast Kit Nuc11phki7c Firmware, Intel Nuc 11 Enthusiast Mini Pc Nuc11phki7caa Firmware, Intel Nuc 11 Performance Kit Nuc11pahi30z Firmware, Intel Nuc 11 Performance Kit Nuc11pahi3 Firmware, Intel Nuc 11 Performance Kit Nuc11pahi50z Firmware, Intel Nuc 11 Performance Kit Nuc11pahi5 Firmware, Intel Nuc 11 Performance Kit Nuc11pahi70z Firmware, Intel Nuc 11 Performance Kit Nuc11pahi7 Firmware, Intel Nuc 11 Performance Kit Nuc11paki3 Firmware, Intel Nuc 11 Performance Kit Nuc11paki5 Firmware, Intel Nuc 11 Performance Kit Nuc11paki7 Firmware, Intel Nuc 11 Performance Mini Pc Nuc11paqi50wa Firmware, Intel Nuc 11 Performance Mini Pc Nuc11paqi70qa Firmware, Intel Nuc 11 Pro Board Nuc11tnbi30z Firmware, Intel Nuc 11 Pro Board Nuc11tnbi3 Firmware, Intel Nuc 11 Pro Board Nuc11tnbi50z Firmware, Intel Nuc 11 Pro Board Nuc11tnbi5 Firmware, Intel Nuc 11 Pro Board Nuc11tnbi70z Firmware, Intel Nuc 11 Pro Board Nuc11tnbi7 Firmware, Intel Nuc 11 Pro Board Nuc11tnbv5 Firmware and 36 more.

## How do I fix CVE-2023-40540?

No fix has been published for CVE-2023-40540 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-40540 being exploited?

There is no known exploitation of CVE-2023-40540 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-40540 and fix it if it is affected.

What it is: CVE-2023-40540 is a medium-severity vulnerability in Intel(R) NUC BIOS firmware, published on 14 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-40540 in the wild and no public exploit code.

Affected product: Intel(R) NUC BIOS firmware. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-40540/ (Markdown: https://insights.sbomify.com/CVE-2023-40540/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-40540
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-40540
- OSV: https://osv.dev/vulnerability/CVE-2023-40540

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-40540/
Summaries are generated and may contain mistakes; the official description above is the record.