CVE-2025-40171
Description
A flaw was found in the Linux kernel's nvmet-fc component, which handles Non-Volatile Memory Express (NVMe) over Fibre Channel. A local attacker with low privileges could exploit a resource management issue. This flaw occurs when multiple asynchronous commands are processed, leading to a leaked reference. This can result in a Denial of Service (DoS), making the system unavailable.
Mitigation
To mitigate this issue, prevent the 'nvmet-fc' kernel module from loading if NVMe over Fibre Channel functionality is not required. Create a file named `/etc/modprobe.d/blacklist-nvmet-fc.conf` with the following content:
blacklist nvmet-fc
install nvmet-fc /bin/true
After creating the file, regenerate the initramfs and reboot the system for the changes to take effect. This may impact systems that rely on NVMe over Fibre Channel for storage operations. A system reboot is required for the changes to be fully applied.
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 | 7.5 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| 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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (Other); DoS: Resource Consumption (Memory); DoS: Resource Consumption (CPU)
An attacker that can influence the allocation of resources that are not properly released could deplete the available resource pool and prevent all other processes from accessing the same type of resource. Frequently-affected resources include memory, CPU, disk space, power or battery, etc.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
