---
title: "CVE-2026-98175: Linux Kernel smb client - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in smb client due to not canceling server->reconnect delayed work in clean_demultiplex_info(), letting attackers cause memory corruption, exploit requires triggering demultiplex thread exit with queued reconnect work."
url: https://panop.io/threat-heartbeat/CVE-2026-98175/
---

# CVE-2026-98175 Linux Kernel smb client - Use After Free

Linux kernel contains a use-after-free vulnerability in smb client due to not canceling server->reconnect delayed work in clean\_demultiplex\_info(), letting attackers cause memory corruption, exploit requires triggering demultiplex thread exit with queued reconnect work.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.33% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98175)

## Details

Type

Use After Free

CVSS vector

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

Published

6 October 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix that cancels server->reconnect delayed work in clean\_demultiplex\_info().

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-2026-98175](https://nvd.nist.gov/vuln/detail/CVE-2026-98175)
- [https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149](https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149)
- [https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8](https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8)
- [https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a](https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a)
- [https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1](https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1)
- [https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52](https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52)

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## 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

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