---
id: CVE-2026-98170
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()

  In move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is
  insufficient
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()

  In move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is
  insufficient. It allows iterati…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 95907fea4fd8ccc736e0a428e52159b4d42b9958 <
    d3546cecbf81d98bf3b472d341f981eb48c04f47
  - >-
    Linux >= 95907fea4fd8ccc736e0a428e52159b4d42b9958 <
    34a3942e787b9c59758115bd65fe1ec89d68c7a4
  - >-
    Linux >= 95907fea4fd8ccc736e0a428e52159b4d42b9958 <
    13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca
  - >-
    Linux >= 95907fea4fd8ccc736e0a428e52159b4d42b9958 <
    eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb
  - Linux 4.14
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T09:17:58.640'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98170'
references:
  - url: 'https://git.kernel.org/stable/c/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/34a3942e787b9c59758115bd65fe1ec89d68c7a4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d3546cecbf81d98bf3b472d341f981eb48c04f47'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98170.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98170'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2546340'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98170'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98170'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98170.mbox
  - url: 'https://git.kernel.org/stable/c/61812323c037a94e2e7f0db7ee740c34b126bffe'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-10-06T08:50:17.457Z'
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-125
epss: 0.00206
epssPercentile: 0.10487
---

## Overview

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

smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()

In move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is
insufficient. It allows iteration to continue even if the remaining
src_size is too small to contain a complete smb2_ea_info structure.
Consequently, reads of ea_name_length and ea_value_length can occur
out-of-bounds.

Fix this by ensuring src_size >= sizeof(*src) before attempting to read
any structure fields. Additionally, reject any next_entry_offset that is
smaller than sizeof(*src) or that would advance the pointer beyond the
available buffer.

Note that for calls where the server returns a malformed EA list, the
error returned to userspace changes from -ENODATA (getxattr) or
-ERANGE (listxattr) to -EIO. This correctly signals a server protocol
error rather than misleadingly indicating "attribute not present" or
"output buffer too small".

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98170.json)