CVE-2025-68242

Local timestamp modification via missing UID check

Published Dec 16, 2025 · Updated Dec 16, 2025

Improper access control in the Linux NFS client allows local users to modify file timestamps without server permission. The nfs_setattr path permits delegated timestamp updates without comparing the inode UID to the caller's fsuid, so mismatched users bypass server-side authorization. Reachability requires a locally accessible NFS mount with delegated timestamps enabled; the bounded impact is unauthorized atime or mtime modification.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in the Linux NFS client allows local users to modify file timestamps without server permission. The nfs_setattr path permits delegated timestamp updates without comparing the inode UID to the caller's fsuid, so mismatched users bypass server-side authorization. Reachability requires a locally accessible NFS mount with delegated timestamps enabled; the bounded impact is unauthorized atime or mtime modification.

The record

CVE
CVE-2025-68242
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1070.006
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=6.11
  2. Affected versionversion=e12912d94137ab36ee704a91f465ff15c8b423da <0e9be902041c6b9f0ed4b72764187eed1067a42f
  3. Affected versionversion=e12912d94137ab36ee704a91f465ff15c8b423da <b2e4cda71ed062c87573b016d2d956a62f4258ed
  4. Affected versionversion=e12912d94137ab36ee704a91f465ff15c8b423da <b623390045a81fc559decb9bfeb79319721d3dfb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=e12912d94137ab36ee704a91f465ff15c8b423da <0e9be902041c6b9f0ed4b72764187eed1067a42f; version=e12912d94137ab36ee704a91f465ff15c8b423da <b2e4cda71ed062c87573b016d2d956a62f4258ed; version=e12912d94137ab36ee704a91f465ff15c8b423da <b623390045a81fc559decb9bfeb79319721d3dfb

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1070.006Timestomp

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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