---
title: "CVE-2026-90103: Linux Kernel NFSv4.2 - Denial of Service"
description: "Linux kernel NFSv4.2 contains a buffer exhaustion vulnerability caused by insufficient send buffer size in LAYOUTSTATS encoding, letting malicious NFS servers cause denial of service by exhausting buffer and locking resources, exploit requires malicious NFS server."
url: https://panop.io/threat-heartbeat/CVE-2026-90103/
---

# CVE-2026-90103 Linux Kernel NFSv4.2 - Denial of Service

Linux kernel NFSv4.2 contains a buffer exhaustion vulnerability caused by insufficient send buffer size in LAYOUTSTATS encoding, letting malicious NFS servers cause denial of service by exhausting buffer and locking resources, exploit requires malicious NFS server.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.70% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90103)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to a Linux kernel version with PNFS\_LAYOUTSTATS\_MAXSIZE raised to 384 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90103](https://nvd.nist.gov/vuln/detail/CVE-2026-90103)
- [https://git.kernel.org/stable/c/a973622da0c62c34043ddbbf382cd761b03e5136](https://git.kernel.org/stable/c/a973622da0c62c34043ddbbf382cd761b03e5136)
- [https://git.kernel.org/stable/c/c75ef2137e749f2673f0617cfdaae53b2bb7195a](https://git.kernel.org/stable/c/c75ef2137e749f2673f0617cfdaae53b2bb7195a)
- [https://git.kernel.org/stable/c/cb11590c7ddc6883a1b1d70b1f98b2779fe626f2](https://git.kernel.org/stable/c/cb11590c7ddc6883a1b1d70b1f98b2779fe626f2)
- [https://git.kernel.org/stable/c/e82d7d999fe9f893f84bf332fd39cb5d9de7128f](https://git.kernel.org/stable/c/e82d7d999fe9f893f84bf332fd39cb5d9de7128f)
- [https://git.kernel.org/stable/c/3815b894b922e9b4f40b8b6f6d67bf80d44141c9](https://git.kernel.org/stable/c/3815b894b922e9b4f40b8b6f6d67bf80d44141c9)
- [https://git.kernel.org/stable/c/397aa7000bbf6b6a0d32e66a544e978fb478c8e4](https://git.kernel.org/stable/c/397aa7000bbf6b6a0d32e66a544e978fb478c8e4)
- [https://git.kernel.org/stable/c/5aca000630c0fd0da102ae1abf9245dd74f2ce36](https://git.kernel.org/stable/c/5aca000630c0fd0da102ae1abf9245dd74f2ce36)
- [https://git.kernel.org/stable/c/842ac26615424577f24f0486b9d3bf97f28fad9c](https://git.kernel.org/stable/c/842ac26615424577f24f0486b9d3bf97f28fad9c)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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