---
title: "CVE-2026-80926: Linux Kernel ksmbd - Use After Free"
description: "Linux kernel ksmbd contains a use-after-free vulnerability caused by unsynchronized access to opinfo->conn in oplock break notification, letting authenticated clients with durable batch oplocks cause memory corruption, exploit requires authenticated client with durable batch oplock."
url: https://panop.io/threat-heartbeat/CVE-2026-80926/
---

# CVE-2026-80926 Linux Kernel ksmbd - Use After Free

Linux kernel ksmbd contains a use-after-free vulnerability caused by unsynchronized access to opinfo->conn in oplock break notification, letting authenticated clients with durable batch oplocks cause memory corruption, exploit requires authenticated client with durable batch oplock.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.44% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80926)

## Details

Type

Use After Free

Impact

Remote Code Execution

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for ksmbd use-after-free in oplock break notification.

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-2026-80926](https://nvd.nist.gov/vuln/detail/CVE-2026-80926)
- [https://git.kernel.org/stable/c/0e753899627b5e28a9fea8bca98262a6f65a2452](https://git.kernel.org/stable/c/0e753899627b5e28a9fea8bca98262a6f65a2452)
- [https://git.kernel.org/stable/c/8cc98db4fc590e6c7d9db6529320982ee16c5d1d](https://git.kernel.org/stable/c/8cc98db4fc590e6c7d9db6529320982ee16c5d1d)
- [https://git.kernel.org/stable/c/c8279ae8df68cce9cd3b785e85f7a86c80a46e78](https://git.kernel.org/stable/c/c8279ae8df68cce9cd3b785e85f7a86c80a46e78)
- [https://git.kernel.org/stable/c/5de0527f782430b1109a447646e32033ad018a6a](https://git.kernel.org/stable/c/5de0527f782430b1109a447646e32033ad018a6a)
- [https://git.kernel.org/stable/c/892f643b141aee3f7aa7c0fc61ddcb55c59f1996](https://git.kernel.org/stable/c/892f643b141aee3f7aa7c0fc61ddcb55c59f1996)

[← 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)