---
title: "CVE-2026-98173: Linux Kernel smb client - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in smb client caused by improper handling of iface list during channel addition in cifs_try_adding_channels(), letting attackers cause memory corruption or denial of service, exploit requires concurrent interface refresh."
url: https://panop.io/threat-heartbeat/CVE-2026-98173/
---

# CVE-2026-98173 Linux Kernel smb client - Use After Free

Linux kernel contains a use-after-free vulnerability in smb client caused by improper handling of iface list during channel addition in cifs\_try\_adding\_channels(), letting attackers cause memory corruption or denial of service, exploit requires concurrent interface refresh.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.33% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98173)

## Details

Type

Use After Free

Impact

Denial Of Service

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.

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-2026-98173](https://nvd.nist.gov/vuln/detail/CVE-2026-98173)
- [https://git.kernel.org/stable/c/d034e836eefd7ce75e588f7031cffbeec594f5ac](https://git.kernel.org/stable/c/d034e836eefd7ce75e588f7031cffbeec594f5ac)
- [https://git.kernel.org/stable/c/e99040e5e9c60441e6b4725e1a7b88c3106ae903](https://git.kernel.org/stable/c/e99040e5e9c60441e6b4725e1a7b88c3106ae903)
- [https://git.kernel.org/stable/c/ec36b38e65596950e6c29bed7dfc90b98707c19c](https://git.kernel.org/stable/c/ec36b38e65596950e6c29bed7dfc90b98707c19c)
- [https://git.kernel.org/stable/c/c941f1ebfd26f683de81091473f3596a218abff0](https://git.kernel.org/stable/c/c941f1ebfd26f683de81091473f3596a218abff0)

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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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