---
title: "CVE-2026-90162: Linux kernel ksmbd - Use-After-Free"
description: "Linux kernel ksmbd contains a use-after-free and double-free race condition caused by premature publishing of granted locks in smb2_lock(), letting concurrent attackers cause memory corruption, exploit requires concurrent SMB2_LOCK and UNLOCK requests."
url: https://panop.io/threat-heartbeat/CVE-2026-90162/
---

# CVE-2026-90162 Linux kernel ksmbd - Use-After-Free

Linux kernel ksmbd contains a use-after-free and double-free race condition caused by premature publishing of granted locks in smb2\_lock(), letting concurrent attackers cause memory corruption, exploit requires concurrent SMB2\_LOCK and UNLOCK requests.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.57% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90162)

## Details

Type

Use-After-Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for deferred lock publishing.

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-2026-90162](https://nvd.nist.gov/vuln/detail/CVE-2026-90162)
- [https://git.kernel.org/stable/c/29f74f0f2e6df3b393b7b66e810136d0c64e3c59](https://git.kernel.org/stable/c/29f74f0f2e6df3b393b7b66e810136d0c64e3c59)
- [https://git.kernel.org/stable/c/a1d26dfb32919088e3638dca01068df3c4507433](https://git.kernel.org/stable/c/a1d26dfb32919088e3638dca01068df3c4507433)
- [https://git.kernel.org/stable/c/ff6870cf3b7eccc69d03cbb6f23e3995d96e9a8d](https://git.kernel.org/stable/c/ff6870cf3b7eccc69d03cbb6f23e3995d96e9a8d)

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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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