Bug 2414505 (CVE-2025-40171)

Summary: CVE-2025-40171 kernel: Kernel: Denial of Service in nvmet-fc due to resource leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
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.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-11-12 11:04:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nvmet-fc: move lsop put work to nvmet_fc_ls_req_op

It’s possible for more than one async command to be in flight from
__nvmet_fc_send_ls_req. For each command, a tgtport reference is taken.

In the current code, only one put work item is queued at a time, which
results in a leaked reference.

To fix this, move the work item to the nvmet_fc_ls_req_op struct, which
already tracks all resources related to the command.
Comment 1 Alexander B 2025-11-13 13:58:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111259-CVE-2025-40171-0cb5@gregkh/T