CVE-2026-43193
Analyzed Analyzed - Analysis Complete
Refcount Leak in Linux Kernel NFS Server

Publication date: 2026-05-06

Last updated on: 2026-05-11

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfs4_file refcount leak in nfsd_get_dir_deleg() Claude pointed out that there is a nfs4_file refcount leak in nfsd_get_dir_deleg(). Ensure that the reference to "fp" is released before returning.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-11
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-14
NVD
CVE-2026-43193
EUVD
EUVD-2026-27756
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel From 6.19 (inc) to 6.19.6 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a reference count leak in the Linux kernel's NFS server component (nfsd). Specifically, it occurs in the function nfsd_get_dir_deleg(), where a reference to an internal object called "nfs4_file" (abbreviated as "fp") is not properly released before the function returns. This means that the system is holding onto resources longer than necessary, which can lead to resource exhaustion.

Impact Analysis

The impact of this vulnerability is primarily related to resource management. Because the reference to the nfs4_file object is not released properly, it can cause a leak of system resources. Over time, this could lead to increased memory usage and potentially degrade system performance or stability, especially on systems heavily using NFS. However, there is no indication that this vulnerability allows for privilege escalation, data corruption, or remote code execution.

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