CVE-2025-68369Network attack vector

NFS service hang via uninitialized run lock

Published Dec 24, 2025 · Updated Dec 24, 2025

Denial of service in affected Linux kernel releases allows remote attackers to hang NFS via a size-increasing SETATTR request. The ntfs3 loader changes $Extend to a regular file without initializing its run_lock, so ntfs_set_size waits indefinitely on a zeroed rwsem. Exposure requires an NTFS3 volume on PREEMPT_RT to be mounted and made writable through NFS; repeated requests can occupy all nfsd threads.

CVSS severity7.5
High
EPSS probability0.45%
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 affected Linux kernel releases allows remote attackers to hang NFS via a size-increasing SETATTR request. The ntfs3 loader changes $Extend to a regular file without initializing its run_lock, so ntfs_set_size waits indefinitely on a zeroed rwsem. Exposure requires an NTFS3 volume on PREEMPT_RT to be mounted and made writable through NFS; repeated requests can occupy all nfsd threads.

The record

CVE
CVE-2025-68369
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17249b2a65274f73ed68bcd1604e08a60fd8a278
  2. Affected versionversion=37f65e68ba9852dc51c78dbb54a9881c3f0fe4f7 <6e17555728bc469d484c59db4a0abc65c19bc315
  3. Affected versionversion=4e8011ffec79717e5fdac43a7e79faf811a384b7 <ab5e8ebeee1caa4fcf8be7d8d62c0a7165469076
  4. Affected versionversion=4e8011ffec79717e5fdac43a7e79faf811a384b7 <be99c62ac7e7af514e4b13f83c891a3cccefaa48
  5. Affected versionversion=57534db1bbc4ca772393bb7d92e69d5e7b9051cf <19164d8228317f3f1fe2662a9ba587cfe3b2d29e
  6. Affected versionversion=6.18
  7. Affected versionversion=63eb6730ce0604d3eacf036c2f68ea70b068317c
  8. Affected versionversion=78d46f5276ed3589aaaa435580068c5b62efc921

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=17249b2a65274f73ed68bcd1604e08a60fd8a278; version=37f65e68ba9852dc51c78dbb54a9881c3f0fe4f7 <6e17555728bc469d484c59db4a0abc65c19bc315; version=4e8011ffec79717e5fdac43a7e79faf811a384b7 <ab5e8ebeee1caa4fcf8be7d8d62c0a7165469076; version=4e8011ffec79717e5fdac43a7e79faf811a384b7 <be99c62ac7e7af514e4b13f83c891a3cccefaa48; version=57534db1bbc4ca772393bb7d92e69d5e7b9051cf <19164d8228317f3f1fe2662a9ba587cfe3b2d29e; version=6.18; version=63eb6730ce0604d3eacf036c2f68ea70b068317c; version=78d46f5276ed3589aaaa435580068c5b62efc921

Published CVSS scores

7.5Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application 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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