CVE-2026-90421
Description
A flaw was found in the Linux kernel's Peripheral Component Interconnect (PCI) subsystem. This Use-After-Free (UAF) vulnerability arises when a PCI device probe operation occurs concurrently with the removal of a dynamic ID. This timing issue could allow a local attacker to cause a system crash, leading to a denial of service, or potentially gain unauthorized access to sensitive information or execute arbitrary code.
Statement
This vulnerability is rated as Moderate impact because successful exploitation requires specific local timing constraints to trigger the race condition, restricting the potential blast radius to a localized denial of service. The flaw resides in the core PCI bus management code when dynamic hardware identifiers are deregistered while device matching executes. Triggering this race condition typically requires privileged access to write to driver sysfs interfaces alongside concurrent device enumeration, making spontaneous or unprivileged exploitation unlikely in standard enterprise environments.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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 | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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