CVE-2026-64460
Description
A flaw was found in the Linux kernel's PCI/IOV subsystem. When a PCI device fails to respond during a power state transition, the kernel's Virtual Function (VF) Resizable Base Address Register (BAR) restoration process can attempt to access memory outside of its allocated bounds. This out-of-bounds memory access can lead to a system crash, resulting in a Denial of Service (DoS).
Statement
This vulnerability is rated as Moderate severity for Red Hat because triggering the flaw requires local system access under anomalous hardware circumstances where a PCI device fails during a power transition, resulting in a denial of service. Because the out-of-bounds read error is confined to the kernel's Virtual Function Resizable BAR restoration path and only occurs when an SR-IOV device becomes completely unresponsive, integrity and confidentiality are not directly compromised. Typical enterprise deployments are not exposed unless utilizing specialized SR-IOV-capable hardware that enters and fails to resume from deep power-saving states.
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 | N/A | 7 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | High |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Changed |
| Confidentiality | None | N/A | Low |
| Integrity Impact | None | N/A | Low |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
