CVE-2026-64519
Received Received - Intake

NFSD Infinite Loop in Layout State Revocation

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix infinite loop in layout state revocation find_one_sb_stid() skips stids whose sc_status is non-zero, but the SC_TYPE_LAYOUT case in nfsd4_revoke_states() never sets sc_status before calling nfsd4_close_layout(). The retry loop therefore finds the same layout stid on every iteration, hanging the revoker indefinitely.

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Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-07-25
AI Q&A
2026-07-25
EPSS Evaluated
N/A
NVD
CVE-2026-64519
EUVD
EUVD-2026-48863

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 in the Linux kernel involves an infinite loop during layout state revocation in the NFS daemon (NFSD). The function find_one_sb_stid() skips stids with a non-zero sc_status, but the SC_TYPE_LAYOUT case in nfsd4_revoke_states() does not set sc_status before calling nfsd4_close_layout(). This causes the revoker to repeatedly find the same layout stid, resulting in an endless loop that hangs the system.

Detection Guidance

This vulnerability is specific to the Linux kernel's NFS daemon (NFSD) and involves an infinite loop in layout state revocation. Detection requires checking for kernel logs or system hangs related to NFS operations. Monitor logs for messages about nfsd4_revoke_states or layout state revocation. Commands like dmesg, journalctl -k, or checking for unresponsive NFS services may help identify the issue.

Impact Analysis

This vulnerability can cause system hangs or crashes when the NFS daemon attempts to revoke layout states. It may lead to denial-of-service conditions, disrupting file access and network services relying on NFS. Systems using affected Linux kernel versions could experience unresponsiveness or require a reboot to recover.

Mitigation Strategies

Apply the latest Linux kernel patches that address this issue. Restart the NFS server to clear any existing infinite loops. Monitor system performance and NFS operations after applying updates. If immediate patching is not possible, consider disabling NFS services temporarily until the fix is applied.

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