---
id: CVE-2026-93811
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

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

  1
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

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

  1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data
     which only freed n.data, sk…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= cb69d4d6f709f87c94afa28ae64c501576692171 <
    f46a70a082bdbfecbe074af8a719c26c4deb58c6
  - >-
    Linux >= 8f0541186e9ad1b62accc9519cc2b7a7240272a7 <
    86c2625fb9863139b359805fc6be1e31edbd3d65
  - >-
    Linux >= 8f0541186e9ad1b62accc9519cc2b7a7240272a7 <
    edc17db83085624a2b1bacf6a4521d7f15571737
  - >-
    Linux >= 8f0541186e9ad1b62accc9519cc2b7a7240272a7 <
    c3836f55e0dab96314774215e12d87f63fa919f2
  - >-
    Linux >= 8f0541186e9ad1b62accc9519cc2b7a7240272a7 <
    6e6329322ad733c5b23555c609353841560b26bc
  - >-
    Linux >= 8f0541186e9ad1b62accc9519cc2b7a7240272a7 <
    d708a36634bb7b6f94d0e76d587d2ec50b2b93b5
  - Linux 6e8f4abf584253cbaa596ea4ad13110cf61cd4c9
  - Linux 8e33102309bd6839b2e2e158f93a7b378cb4655d
  - Linux >= 5.15.62 < 5.15.222
  - Linux >= 5.18.18 < 5.19
  - Linux >= 5.19.2 < 5.20
  - Linux 6.0
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:50.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93811'
references:
  - url: 'https://git.kernel.org/stable/c/6e6329322ad733c5b23555c609353841560b26bc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/86c2625fb9863139b359805fc6be1e31edbd3d65'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c3836f55e0dab96314774215e12d87f63fa919f2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d708a36634bb7b6f94d0e76d587d2ec50b2b93b5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/edc17db83085624a2b1bacf6a4521d7f15571737'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f46a70a082bdbfecbe074af8a719c26c4deb58c6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00173
epssPercentile: 0.06622
ingestedAt: '2026-09-24T16:47:15.895Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

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

1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data
   which only freed n.data, skipping kfree(acl.sd_buf) and leaking
   the buffer. Zero-initialize struct xattr_ntacl acl, reorder error
   labels to out_free to release acl.sd_buf on all error paths.

2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code
   returned success without freeing sd_buf and left stale *pntsd.
   Set rc = -EINVAL before jumping to out_free to return error code and
   free buffer.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.