---
title: "CVE-2026-93813: Linux kernel btrfs - Denial of Service"
description: "Linux kernel btrfs contains a buffer overflow caused by improper validation of INODE_REF's namelen in tree-checker, letting attackers trigger kernel crash via crafted btrfs image, exploit requires crafted malicious btrfs image."
url: https://panop.io/threat-heartbeat/CVE-2026-93813/
---

# CVE-2026-93813 Linux kernel btrfs - Denial of Service

Linux kernel btrfs contains a buffer overflow caused by improper validation of INODE\_REF's namelen in tree-checker, letting attackers trigger kernel crash via crafted btrfs image, exploit requires crafted malicious btrfs image.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.13% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93813)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

24 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for INODE\_REF namelen validation.

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-2026-93813](https://nvd.nist.gov/vuln/detail/CVE-2026-93813)
- [https://git.kernel.org/stable/c/8f75c19892263bc0555fba922aefe103e841e86d](https://git.kernel.org/stable/c/8f75c19892263bc0555fba922aefe103e841e86d)
- [https://git.kernel.org/stable/c/eeddee090b834a7d4b6a8214d2e3739e64c7a338](https://git.kernel.org/stable/c/eeddee090b834a7d4b6a8214d2e3739e64c7a338)
- [https://git.kernel.org/stable/c/4cb41f07685f88ec724a375883bb0c731db8f6eb](https://git.kernel.org/stable/c/4cb41f07685f88ec724a375883bb0c731db8f6eb)
- [https://git.kernel.org/stable/c/509d6a4d889e425f305461d8323a7b39ca6c121c](https://git.kernel.org/stable/c/509d6a4d889e425f305461d8323a7b39ca6c121c)
- [https://git.kernel.org/stable/c/60078a3e25c09d9d8fba828b0d81bb33e449a1b2](https://git.kernel.org/stable/c/60078a3e25c09d9d8fba828b0d81bb33e449a1b2)
- [https://git.kernel.org/stable/c/3dc22abc21f5892406c09202fa2627196cc96967](https://git.kernel.org/stable/c/3dc22abc21f5892406c09202fa2627196cc96967)

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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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