---
title: "CVE-2026-93786: Linux Kernel - Broken Access Control"
description: "Linux kernel contains a broken access control vulnerability in ksmbd due to improper handling of VFS inherited POSIX ACL mask, letting attackers create SMB objects without widening effective permissions, exploit requires SMB object creation."
url: https://panop.io/threat-heartbeat/CVE-2026-93786/
---

# CVE-2026-93786 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability in ksmbd due to improper handling of VFS inherited POSIX ACL mask, letting attackers create SMB objects without widening effective permissions, exploit requires SMB object creation.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.34% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93786)

## Details

Type

Broken Access Control

Impact

Broken Access Control

CVSS vector

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

Published

24 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-2026-93786](https://nvd.nist.gov/vuln/detail/CVE-2026-93786)
- [https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0](https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0)
- [https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70](https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70)
- [https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a](https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a)
- [https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f](https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f)

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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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