CVE-2025-40343
Description
A flaw was found in the Linux kernel's NVMe over Fibre Channel (nvmet-fc) target subsystem. When forcefully shutting down a port through the configfs interface, both nvmet_port_del_ctrls() and nvmet_disable_port() schedule association deletions. Due to insufficient synchronization, the same work item can be scheduled twice, leading to a double-free condition where resources are freed by the first work item and then the same work item attempts to free them again. This can cause memory corruption, system crashes, or potentially be exploited for privilege escalation.
Statement
This vulnerability affects systems configured as NVMe over Fibre Channel targets. Exploitation requires local access with permissions to manage the nvmet-fc configfs interface. The race condition occurs during port shutdown operations.
Mitigation
To mitigate this issue, prevent the nvmet_fc module from being loaded if NVMe over Fibre Channel target functionality is not required. See https://access.redhat.com/solutions/41278 for instructions on how to blacklist a kernel module.
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 | 5.2 | N/A | 9.8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | High | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | High |
| Integrity Impact | Low | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Application Data; Modify Memory; DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands
It may be possible to cause data corruption and possibly execute arbitrary code by modifying global variables or data structures at unexpected times, violating the assumptions of code that uses this global data.
Access Control
Technical Impact: Gain Privileges or Assume Identity
If a signal handler interrupts code that is executing with privileges, it may be possible that the signal handler will also be executed with elevated privileges, possibly making subsequent exploits more severe.
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