CVE-2026-43266

Description

A flaw was found in the Linux kernel's handling of Common Platform Error Records (CPER) for ARM processors. This vulnerability allows a local attacker or malicious firmware to provide a malformed CPER record with an excessively large section length. The kernel then attempts to read data beyond the intended memory buffer, which can lead to a system crash, causing a Denial of Service. This issue could also potentially disclose sensitive information from the kernel's memory.

Statement

Red Hat acknowledges the upstream Linux kernel correction for «EFI/CPER» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score5.55.5N/A
Attack VectorLocalLocalN/A
Attack ComplexityLowLowN/A
Privileges RequiredLowLowN/A
User InteractionNoneNoneN/A
ScopeUnchangedUnchangedN/A
ConfidentialityNoneNoneN/A
Integrity ImpactNoneNoneN/A
Availability ImpactHighHighN/A

Vector

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

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

Understanding the Weakness (CWE)

CWE-130

Confidentiality,Integrity

Technical Impact: Read Memory; Modify Memory; Varies by Context

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