---
title: "CVE-2026-98361: Linux Kernel - Broken Access Control"
description: "Linux kernel contains a broken access control vulnerability in RDMA/rxe ODP write paths caused by missing HMM_PFN_WRITE check, letting unprivileged users overwrite read-only page cache via RDMA, exploit requires unprivileged user registering ODP MR over read-only mappings."
url: https://panop.io/threat-heartbeat/CVE-2026-98361/
---

# CVE-2026-98361 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability in RDMA/rxe ODP write paths caused by missing HMM\_PFN\_WRITE check, letting unprivileged users overwrite read-only page cache via RDMA, exploit requires unprivileged user registering ODP MR over read-only mappings.

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-2026-98361)

## 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

6 October 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for restored HMM\_PFN\_WRITE check in RDMA/rxe ODP write paths.

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-2026-98361](https://nvd.nist.gov/vuln/detail/CVE-2026-98361)
- [https://git.kernel.org/stable/c/2d6c6f94d3e1cde049fe5db71dbd5549f10b2de1](https://git.kernel.org/stable/c/2d6c6f94d3e1cde049fe5db71dbd5549f10b2de1)
- [https://git.kernel.org/stable/c/769001ce838d907ecaa95f1d0a4e8fc86f761f9f](https://git.kernel.org/stable/c/769001ce838d907ecaa95f1d0a4e8fc86f761f9f)
- [https://git.kernel.org/stable/c/c6f56982ec5c7da83c4bdfcce3b6db18bcfe6425](https://git.kernel.org/stable/c/c6f56982ec5c7da83c4bdfcce3b6db18bcfe6425)

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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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