CVE-2026-23053
Unknown Unknown - Not Provided

Deadlock Vulnerability in Linux Kernel NFSv4.1 Memory Reclamation

Publication date: 2026-02-04

Last updated on: 2026-03-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a deadlock involving nfs_release_folio() Wang Zhaolong reports a deadlock involving NFSv4.1 state recovery waiting on kthreadd, which is attempting to reclaim memory by calling nfs_release_folio(). The latter cannot make progress due to state recovery being needed. It seems that the only safe thing to do here is to kick off a writeback of the folio, without waiting for completion, or else kicking off an asynchronous commit.

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Meta Information

Published
2026-02-04
Last Modified
2026-03-25
Generated
2026-07-06
AI Q&A
2026-02-04
EPSS Evaluated
2026-07-05
NVD
CVE-2026-23053
EUVD
EUVD-2026-5493

Affected Vendors & Products

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

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a deadlock issue in the Linux kernel related to the Network File System (NFS), specifically involving the function nfs_release_folio().

The deadlock occurs during NFSv4.1 state recovery when the kernel thread (kthreadd) tries to reclaim memory by calling nfs_release_folio(), but cannot proceed because state recovery is still needed, causing a circular wait.

The fix involves initiating a writeback of the folio without waiting for it to complete or starting an asynchronous commit to avoid the deadlock.

Impact Analysis

This deadlock vulnerability can cause the Linux kernel to hang or become unresponsive during NFSv4.1 state recovery operations.

Such a deadlock may lead to system performance degradation, potential service interruptions, or inability to reclaim memory properly, which could affect applications relying on NFS.

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