---
title: "CVE-2026-90260: Linux Kernel btrfs - Memory Corruption"
description: "Linux kernel btrfs zoned filesystem contains a memory corruption vulnerability caused by zeroing out extent buffer folios in btree_csum_one_bio(), letting attackers corrupt extent tree metadata, exploit requires use of zoned filesystems with specific write patterns."
url: https://panop.io/threat-heartbeat/CVE-2026-90260/
---

# CVE-2026-90260 Linux Kernel btrfs - Memory Corruption

Linux kernel btrfs zoned filesystem contains a memory corruption vulnerability caused by zeroing out extent buffer folios in btree\_csum\_one\_bio(), letting attackers corrupt extent tree metadata, exploit requires use of zoned filesystems with specific write patterns.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90260)

## Details

Type

Memory Corruption

Impact

Data Tampering, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 this issue.

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-2026-90260](https://nvd.nist.gov/vuln/detail/CVE-2026-90260)
- [https://git.kernel.org/stable/c/92484ad014f2e2b0e0e7bbc1610951e978cf557c](https://git.kernel.org/stable/c/92484ad014f2e2b0e0e7bbc1610951e978cf557c)
- [https://git.kernel.org/stable/c/98e3747587f9f87f010d8d7e55786216249a94af](https://git.kernel.org/stable/c/98e3747587f9f87f010d8d7e55786216249a94af)
- [https://git.kernel.org/stable/c/db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c](https://git.kernel.org/stable/c/db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c)

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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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