CVE-2026-90341

Memory disclosure or crash via malformed coreboot table

Published Sep 17, 2026 · Updated Sep 18, 2026

Out-of-bounds read in the Linux coreboot table driver from 4.12 allows local attackers to disclose physical memory or crash the kernel. coreboot_table_probe() replaces the platform resource length with firmware-supplied 32-bit header and table sizes, then maps and parses an unchecked extent beyond that resource. Exploitation requires an affected kernel to process a malformed coreboot table during probe; no Linux account or user action is required.

CVSS severity7.7
High
EPSS probability0.19%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux coreboot table driver from 4.12 allows local attackers to disclose physical memory or crash the kernel. coreboot_table_probe() replaces the platform resource length with firmware-supplied 32-bit header and table sizes, then maps and parses an unchecked extent beyond that resource. Exploitation requires an affected kernel to process a malformed coreboot table during probe; no Linux account or user action is required.

The record

CVE
CVE-2026-90341
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.12
  2. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <2d98a3b89394f283f054a4a54587c14ee89acaf9
  3. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <3cca0d6dd4c2636d2514234233cb02db76621607
  4. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <88027241c1d2c3213bac937a1c2cb89a5775a413
  5. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <a58a57a1076f8c5dae0327e3710899478c3be901
  6. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <d848fac90c6f0566e7b93066b0b86024f65f395e
  7. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <e82f260a74dea8cdd7857f2cc66f73d0da522bb3
  8. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <f79f621215a0944c4a0e1b3b86b99e433ae8c527
  9. Affected versionversion=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <fd93859ecfa5b6495a6863c18fd923a7666def26

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <2d98a3b89394f283f054a4a54587c14ee89acaf9; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <3cca0d6dd4c2636d2514234233cb02db76621607; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <88027241c1d2c3213bac937a1c2cb89a5775a413; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <a58a57a1076f8c5dae0327e3710899478c3be901; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <d848fac90c6f0566e7b93066b0b86024f65f395e; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <e82f260a74dea8cdd7857f2cc66f73d0da522bb3; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <f79f621215a0944c4a0e1b3b86b99e433ae8c527; version=d384d6f43d1ec3f1225ab0275fd592c5980bd830 <fd93859ecfa5b6495a6863c18fd923a7666def26

Published CVSS scores

7.7Linux CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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