CVE-2025-68243

Local NFS identity confusion via incomplete client matching

Published Dec 16, 2025 · Updated Dec 16, 2025

Client identity confusion in the Linux NFS client 6.17 through 6.17.8 allows local users to reuse a client with different X.509 credentials. The nfs_match_client() function compared the transport security policy but omitted the certificate and private-key serial fields when selecting a cached client. The condition requires RPC_XPRTSEC_TLS_X509 and otherwise matching client attributes; published sources do not describe a demonstrated follow-on operation.

CVSS severity7.0
High
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Client identity confusion in the Linux NFS client 6.17 through 6.17.8 allows local users to reuse a client with different X.509 credentials. The nfs_match_client() function compared the transport security policy but omitted the certificate and private-key serial fields when selecting a cached client. The condition requires RPC_XPRTSEC_TLS_X509 and otherwise matching client attributes; published sources do not describe a demonstrated follow-on operation.

The record

CVE
CVE-2025-68243
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=6.17
  2. Affected versionversion=90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 <b8fa37219074811c04d4ecb742c73e2b296da6a8
  3. Affected versionversion=90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 <fb2cba0854a7f315c8100a807a6959b99d72479e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.17; version=90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 <b8fa37219074811c04d4ecb742c73e2b296da6a8; version=90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 <fb2cba0854a7f315c8100a807a6959b99d72479e

Published CVSS scores

7.0kernel.orgCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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