---
title: "CVE-2026-98974: Linux Kernel XFS - Broken Access Control"
description: "Linux kernel XFS filesystem contains a broken access control vulnerability caused by incorrect handling of file sizes in XFS_IOC_EXCHANGE_RANGE's TO_EOF flag, letting attackers modify shared blocks beyond EOF, exploit requires reflink and exchange-range enabled filesystem."
url: https://panop.io/threat-heartbeat/CVE-2026-98974/
---

# CVE-2026-98974 Linux Kernel XFS - Broken Access Control

Linux kernel XFS filesystem contains a broken access control vulnerability caused by incorrect handling of file sizes in XFS\_IOC\_EXCHANGE\_RANGE's TO\_EOF flag, letting attackers modify shared blocks beyond EOF, exploit requires reflink and exchange-range enabled filesystem.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98974)

## Details

Type

Broken Access Control

Impact

Data Tampering

CVSS vector

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

Published

23 October 2026

Updated

25 October 2026

## Vendor fix

Update to the Linux kernel version containing the patch that fixes XFS\_IOC\_EXCHANGE\_RANGE TO\_EOF file size handling.

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-2026-98974](https://nvd.nist.gov/vuln/detail/CVE-2026-98974)
- [https://git.kernel.org/stable/c/7dfb218c829c1acb626e0fe92c5fddb9a26a03e9](https://git.kernel.org/stable/c/7dfb218c829c1acb626e0fe92c5fddb9a26a03e9)
- [https://git.kernel.org/stable/c/952b5c99a840c2bff1f6645fd5e06e1db6ec2623](https://git.kernel.org/stable/c/952b5c99a840c2bff1f6645fd5e06e1db6ec2623)
- [https://git.kernel.org/stable/c/b361d32b884f8ddcb9bad5d99b69eece648f8e43](https://git.kernel.org/stable/c/b361d32b884f8ddcb9bad5d99b69eece648f8e43)
- [https://git.kernel.org/stable/c/cf32eb20dfacfd2e92ce86ba1fece9ae5f98a7d8](https://git.kernel.org/stable/c/cf32eb20dfacfd2e92ce86ba1fece9ae5f98a7d8)

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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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