Vulnary
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Critical· 9.8official fix available

CVE-2025-40261

A bug in the Linux kernel’s NVMe‑FC driver can cause the system to crash when a controller is deleted. The issue occurs if an error triggers a work item after the controller has been freed, leading to a kernel panic. The problem has been fixed in newer kernel releases.

publishedDec 4, 2025
last modifiedJul 30, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
43th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 29, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux kernel users who run NVMe over Fibre Channel devices, especially on servers and workstations that have not yet upgraded to a kernel version containing the fix.

02

Real-world impact

The flaw can crash the entire operating system, causing a denial‑of‑service. If an attacker can trigger the crash while having the ability to run code, they could potentially gain root privileges.

03

Why this severity

The CVSS score of 9.8 reflects a critical vulnerability: it can be exploited remotely without authentication, and it can compromise confidentiality, integrity, and availability of the system.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade your Linux kernel to a version that includes the nvme‑fc fix (e.g., a kernel released after the patch was applied).
  2. 02Reboot the system to load the updated kernel.

NVD-referenced vendor advisory

05

Timeline

  1. Dec 4, 2025 · Dec 4, 2025
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 30, 2026 · 6d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 30, 2026 · 6d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →