CVE-2026-23085
Description
An address truncation vulnerability was found in the Linux kernel's GICv3 ITS interrupt controller driver on 32-bit ARM systems with LPAE (Large Physical Address Extension). Physical addresses above 4GB are incorrectly stored in 32-bit unsigned long variables, causing address truncation. When kmalloc() returns memory from ZONE_NORMAL above 4GB, the truncated address causes the GICv3 driver to crash.
Statement
This vulnerability specifically affects 32-bit ARM systems with LPAE enabled and physical memory above 4GB. It was discovered in QEMU virtual machine environments with larger VMSPLIT configurations. Standard 64-bit systems and 32-bit systems without high memory are not affected. The crash occurs during boot, preventing the system from starting.
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 Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/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)
Other,Integrity
Technical Impact: Unexpected State; Quality Degradation
The program could wind up using the wrong number and generate incorrect results. If the number is used to allocate resources or make a security decision, then this could introduce a vulnerability.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
