CVE-2026-64519

State-revocation hang via unmarked layout state

Published Jul 25, 2026 · Updated Jul 25, 2026

Denial of service in Linux Kernel NFSD allows local users to hang layout-state revocation during an administrative operation. In nfsd4_revoke_states(), the SC_TYPE_LAYOUT branch calls nfsd4_close_layout() without first setting sc_status, so find_one_sb_stid() repeatedly returns the same state ID. Reachability requires NFSD layout state and an administrative revocation action; the revoker hangs indefinitely rather than reporting completion.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux Kernel NFSD allows local users to hang layout-state revocation during an administrative operation. In nfsd4_revoke_states(), the SC_TYPE_LAYOUT branch calls nfsd4_close_layout() without first setting sc_status, so find_one_sb_stid() repeatedly returns the same state ID. Reachability requires NFSD layout state and an administrative revocation action; the revoker hangs indefinitely rather than reporting completion.

The record

CVE
CVE-2026-64519
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1e33e1414bec54a4feafa9e67e2617031be0afe2 <44e5e4eb3a07bf3e1d931dd9f96f3edcfa376605
  2. Affected versionversion=1e33e1414bec54a4feafa9e67e2617031be0afe2 <4f8ef58c10bfe5f86a643c7c8331b37e69e3dae1
  3. Affected versionversion=1e33e1414bec54a4feafa9e67e2617031be0afe2 <d1fc00ec02e9deb3f8d2bd59caf938c554fbc576
  4. Affected versionversion=1e33e1414bec54a4feafa9e67e2617031be0afe2 <fe59ae27d7346245f5d8d97220f374e63efd28b5
  5. Affected versionversion=6.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1e33e1414bec54a4feafa9e67e2617031be0afe2 <44e5e4eb3a07bf3e1d931dd9f96f3edcfa376605; version=1e33e1414bec54a4feafa9e67e2617031be0afe2 <4f8ef58c10bfe5f86a643c7c8331b37e69e3dae1; version=1e33e1414bec54a4feafa9e67e2617031be0afe2 <d1fc00ec02e9deb3f8d2bd59caf938c554fbc576; version=1e33e1414bec54a4feafa9e67e2617031be0afe2 <fe59ae27d7346245f5d8d97220f374e63efd28b5; version=6.9

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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