---
id: CVE-2026-98405
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix missing iov bounds check in parse_posix_sids()

  In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied
  out_len without being valida…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix missing iov bounds check in parse_posix_sids()

  In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied
  out_len without being valida…
severity: none
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T14:17:51.603'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98405'
references:
  - url: 'https://git.kernel.org/stable/c/2f8ed71aaaba3bc8b19cd9930cc62e63e142b299'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b862996e5105be1293da9cdc85da77b76021c3bd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eac6917a42899aad0617bbf04798c5dd946a1fe5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
ingestedAt: '2026-10-14T15:36:13.982Z'
---

## Overview

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

smb: client: fix missing iov bounds check in parse_posix_sids()

In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied
out_len without being validated against the actual length of the received
iov (iov_len).

If a server provides an inflated out_len, sidsbuf_end will point past the
end of the iov. This defeats the bounds guards in posix_info_sid_size(),
allowing out-of-bounds reads into adjacent kernel memory.

Fix this by rejecting responses where the calculated sidsbuf_end would
exceed the received iov boundaries or cause pointer wraparound.

## Remediation

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