CVE-2026-90155

kernel: ksmbd: detach blocked lock requests before freeing

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 17, 2026

Updated · October 13, 2026

Description

A flaw was found in ksmbd, a Linux kernel module that provides an in-kernel SMB server. This vulnerability occurs due to improper handling of file lock requests. When file_lock objects are freed while still part of the Virtual File System (VFS) blocked-request graph, it can lead to a system crash, resulting in a Denial of Service (DoS). Additionally, a freed ksmbd_lock object may remain reachable, potentially leading to further instability.

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

No mitigation is specified in collected source.

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-826 · Premature Release of Resource During Expected Lifetime