# CVE-2026-90341: firmware: coreboot: Validate table bounds

> A malformed coreboot table can cause an integer overflow, leading to out-of-bounds memory access and potential code execution or denial of service in the Linux kernel.

- **Severity:** High 7.7 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-101927, BELL-CVE-2026-90341, DEBIAN-CVE-2026-90341, GHSA-24q3-gvvv-jw93, UBUNTU-CVE-2026-90341

## What is CVE-2026-90341?

CVE-2026-90341 is a high-severity vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

firmware: coreboot: Validate table bounds

The existing coreboot_table_populate() bounds checks limit individual
entries to the mapped length.  However, coreboot_table_probe() replaces
the platform resource length with header and table sizes supplied by
firmware before mapping the full table.

A malformed table can overflow the 32-bit size addition or advertise an
extent beyond the resource, causing the driver to map and parse memory
outside the resource.  A resource shorter than the fixed header is also
mapped as though it contained a complete header.

Reject resources shorter than the fixed header.  After validating the
signature, require a complete header, calculate the advertised extent
with overflow checking, and reject extents beyond the resource before
remapping the table.

## Which versions are affected by CVE-2026-90341?


## How do I fix CVE-2026-90341?

Apply the vendor's patch.

## Is CVE-2026-90341 being exploited?

There is no known exploitation of CVE-2026-90341 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90341 and fix it if it is affected.

What it is: CVE-2026-90341 is a high-severity vulnerability in Linux, published on 17 Sep 2026. 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-2026-90341 in the wild and no public exploit code.

Affected product: Linux. 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-2026-90341/ (Markdown: https://insights.sbomify.com/CVE-2026-90341/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90341
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90341
- OSV: https://osv.dev/vulnerability/CVE-2026-90341

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90341/
Summaries are generated and may contain mistakes; the official description above is the record.