CVE-2026-90341 (CVSS 7.7)

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.

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CVSS v3.1 Score

7.7

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS — Exploit Prediction

0.0019

Probability of exploitation

0.08%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

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

Frequently Asked Questions

What is CVE-2026-90341? +

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. It has a CVSS v3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-90341? +

CVE-2026-90341 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0019, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-90341? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-90341