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CVE-2023-54203

kernel: Linux kernel ksmbd: Slab-out-of-bounds vulnerability allows information disclosure and denial of service

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Severity

Important

Red Hat Product Security

9.1

CVSS 3.1

Review impact separately from score.

Published · December 30, 2025

Updated · August 21, 2026

Description

A flaw was found in ksmbd, a Linux kernel module that provides an in-kernel Server Message Block (SMB) server. When processing an SMB1 negotiate request as an SMB2 server operation, a slab-out-of-bounds memory error occurs in the init_smb2_rsp_hdr function. This vulnerability could allow a remote attacker to disclose sensitive information or cause a denial of service.

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 · 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE-125 · Out-of-bounds Read