---
title: "CVE-2026-89632: Linux Kernel smb client - Use-After-Check"
description: "Linux kernel contains a use-after-check vulnerability in smb client reparse_buf_ptr() caused by reading ReparseDataLength before validating buffer length, letting remote attackers cause memory corruption, exploit requires crafted server response."
url: https://panop.io/threat-heartbeat/CVE-2026-89632/
---

# CVE-2026-89632 Linux Kernel smb client - Use-After-Check

Linux kernel contains a use-after-check vulnerability in smb client reparse\_buf\_ptr() caused by reading ReparseDataLength before validating buffer length, letting remote attackers cause memory corruption, exploit requires crafted server response.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.45% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89632)

## Details

Type

Use-After-Check

Impact

Denial Of Service, Remote Code Execution

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89632](https://nvd.nist.gov/vuln/detail/CVE-2026-89632)
- [https://git.kernel.org/stable/c/05f78e6cf34ea3a285053bd5999e08e8ac298bd5](https://git.kernel.org/stable/c/05f78e6cf34ea3a285053bd5999e08e8ac298bd5)
- [https://git.kernel.org/stable/c/711cf71300d7992f450600df8864917d3538679f](https://git.kernel.org/stable/c/711cf71300d7992f450600df8864917d3538679f)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)