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CVE-2026-43470

kernel: nfs: return EISDIR on nfs3_proc_create if d_alias is a dir

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 8, 2026

Updated · June 28, 2026

Description

A flaw was found in the Network File System (NFS) implementation within the Linux kernel. When directories and files are created and removed concurrently with the same name, a race condition can occur. This can lead to the system attempting to perform file operations on a directory, resulting in a kernel "oops" and causing a Denial of Service (DoS).

Statement

This Moderate severity flaw in the Linux kernel's NFS implementation can lead to a denial of service. It requires a local attacker to perform specific concurrent file and directory operations on an NFS mount, which can trigger a kernel 'oops'. Remote exploitation without prior local access is not possible.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition