# CVE-2019-6156: Security feature bypass in BIOS

> Lenovo BIOS fails to restore SPI Protected Range Registers after sleep, bypassing a secondary defense layer while primary protection remains active.

- **Severity:** Low 3.3 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Apr 2019
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-9wmj-xcgw-57p9

## What is CVE-2019-6156?

CVE-2019-6156 is a low-severity vulnerability in Lenovo BIOS, published on 10 Apr 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash. While this provides sufficient protection, an additional layer of protection is provided by SPI Protected Range Registers (PRx). Lenovo was notified that after resuming from S3 sleep mode in various versions of BIOS for Lenovo systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.

Weakness: CWE-667 (Improper Locking)

## Which versions are affected by CVE-2019-6156?

It affects 177 products.


Products: Lenovo 330-14igm Firmware, Lenovo 330-15igm Firmware, Lenovo 510-15ikl Firmware, Lenovo 510s-08ikl Firmware, Lenovo 530s-07icb Firmware, Lenovo Aio300-23isu\(c5130\) Firmware, Lenovo Aio520-22ikl Firmware, Lenovo Aio520-22iku Firmware, Lenovo Aio520-24ikl Firmware, Lenovo Aio520-24iku Firmware, Lenovo Aio520-27ikl Firmware, Lenovo Aio 910-27ish Firmware, Lenovo Aio Y910-27ish Firmware, Lenovo H50-30g Desktop Firmware, Lenovo Ideacentre 300-20ish Firmware, Lenovo Ideacentre 300s-11ish Firmware, Lenovo Ideacentre 510-15icb Firmware, Lenovo Ideacentre 510a-15icb Firmware, Lenovo Ideacentre 510s-08ish Firmware, Lenovo Ideacentre 520s-23iku Firmware and 157 more.

## How do I fix CVE-2019-6156?

No fix has been published for CVE-2019-6156 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6156 being exploited?

There is no known exploitation of CVE-2019-6156 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6156 and fix it if it is affected.

What it is: CVE-2019-6156 is a low-severity vulnerability in Lenovo BIOS, published on 10 Apr 2019. 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-2019-6156 in the wild and no public exploit code.

Affected product: Lenovo BIOS. 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-2019-6156/ (Markdown: https://insights.sbomify.com/CVE-2019-6156/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6156
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6156
- OSV: https://osv.dev/vulnerability/CVE-2019-6156

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-6156/
Summaries are generated and may contain mistakes; the official description above is the record.