In the Linux kernel, the following vulnerability has been resolved: NFSD: Protect against send buffer overflow in NFSv3 READ Since before the git era, NFSD has conserved the number of pages held by each nfsd thread by combining the RPC receive and send buffers into a single array of pages. This works because there are no cases where an operation needs a large RPC Call message and a large RPC Reply at the same time. Once an RPC Call has been received, svc_process() updates svc_rqst::rq_res to describe the part of rq_pages that can be used for constructing the Reply. This means that the send buffer (rq_res) shrinks when the received RPC record containing the RPC Call is large. A client can force this shrinkage on TCP by sending a correctly- formed RPC Call header contained in an RPC record that is excessively large. The full maximum payload size cannot be constructed in that case.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/309f29361b6bfae96936317376f1114568c5de19 cve-icon cve-icon
https://git.kernel.org/stable/c/75d9de25a6f833dd0701ca546ac926cabff2b5af cve-icon cve-icon
https://git.kernel.org/stable/c/bc6c0ed253cd4763dba7541d558e4b704f33176f cve-icon cve-icon
https://git.kernel.org/stable/c/c23687911f82a63fa2977ce9c992b395e90f8ba0 cve-icon cve-icon
https://git.kernel.org/stable/c/fa6be9cc6e80ec79892ddf08a8c10cabab9baf38 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025091639-CVE-2022-50345-a1ff@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-50345 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-50345 cve-icon
History

Wed, 17 Sep 2025 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Wed, 17 Sep 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Tue, 16 Sep 2025 16:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: NFSD: Protect against send buffer overflow in NFSv3 READ Since before the git era, NFSD has conserved the number of pages held by each nfsd thread by combining the RPC receive and send buffers into a single array of pages. This works because there are no cases where an operation needs a large RPC Call message and a large RPC Reply at the same time. Once an RPC Call has been received, svc_process() updates svc_rqst::rq_res to describe the part of rq_pages that can be used for constructing the Reply. This means that the send buffer (rq_res) shrinks when the received RPC record containing the RPC Call is large. A client can force this shrinkage on TCP by sending a correctly- formed RPC Call header contained in an RPC record that is excessively large. The full maximum payload size cannot be constructed in that case.
Title NFSD: Protect against send buffer overflow in NFSv3 READ
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-09-16T16:11:24.171Z

Updated: 2025-09-16T16:11:38.348Z

Reserved: 2025-09-16T16:03:27.881Z

Link: CVE-2022-50345

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-09-16T17:15:34.203

Modified: 2025-09-17T14:18:55.093

Link: CVE-2022-50345

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-09-16T00:00:00Z

Links: CVE-2022-50345 - Bugzilla