CVE-2026-74730
Received Received - Intake

Use-After-Free in Linux Kernel NFS Server

Vulnerability report for CVE-2026-74730, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: NFS: Pin the 'struct nfs_server' during a FREE_STATEID call Dan Aloni reports that he was able to hit a use-after-free bug if a FREE_STATEID operation gets delayed for whatever reason. Fix this by bumping the refcount of the 'struct nfs_server' object for the duration of the FREE_STATEID so it doesn't get cleaned up from underneath us while operations are still in flight.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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 is a use-after-free vulnerability in the Linux kernel's NFS implementation. It occurs during a FREE_STATEID operation when the operation is delayed, causing the 'struct nfs_server' object to be freed while still in use. The fix involves increasing the reference count of the 'struct nfs_server' during the operation to prevent premature cleanup.

Impact Analysis

If exploited, this vulnerability could lead to system crashes, data corruption, or potential privilege escalation. It primarily affects systems using NFS (Network File System) where state operations may be delayed.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this use-after-free bug in the NFS FREE_STATEID operation.

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