CVE-2026-93811

kernel: ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 24, 2026

Updated · October 7, 2026

Description

A flaw was found in the Linux kernel's ksmbd Server Message Block (SMB) server. When processing access control list (ACL) data, error-handling routines fail to release memory buffers if decoding fails or if an invalid security descriptor size is encountered. A remote attacker could exploit this vulnerability by repeatedly triggering these error paths, causing memory leaks that may lead to system resource exhaustion and a denial of service (DoS).

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-772 · Missing Release of Resource after Effective Lifetime