---
title: "CVE-2026-98366: Linux Kernel RDMA/rxe - Use After Free"
description: "Linux kernel RDMA/rxe contains a use-after-free caused by improper validation of access flags before reassigning MR's PD in rxe_rereg_user_mr(), letting local attackers cause memory corruption, exploit requires local access."
url: https://panop.io/threat-heartbeat/CVE-2026-98366/
---

# CVE-2026-98366 Linux Kernel RDMA/rxe - Use After Free

Linux kernel RDMA/rxe contains a use-after-free caused by improper validation of access flags before reassigning MR's PD in rxe\_rereg\_user\_mr(), letting local attackers cause memory corruption, exploit requires local access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98366)

## Details

Type

Use After Free

Impact

Denial Of Service, Privilege Escalation

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 proper access flag validation before PD reassignment.

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-2026-98366](https://nvd.nist.gov/vuln/detail/CVE-2026-98366)
- [https://git.kernel.org/stable/c/ae36a5b609ae79f4de966328b78d2584be9719a4](https://git.kernel.org/stable/c/ae36a5b609ae79f4de966328b78d2584be9719a4)
- [https://git.kernel.org/stable/c/fe602c91a52e161ace4afd5bdb8f33270c554c6f](https://git.kernel.org/stable/c/fe602c91a52e161ace4afd5bdb8f33270c554c6f)
- [https://git.kernel.org/stable/c/08f12745cb72981aa2cabe214af0c7a42a856f0a](https://git.kernel.org/stable/c/08f12745cb72981aa2cabe214af0c7a42a856f0a)
- [https://git.kernel.org/stable/c/4dd7a53f1c5b44693c26dac4b9b5bd5bb9d604c8](https://git.kernel.org/stable/c/4dd7a53f1c5b44693c26dac4b9b5bd5bb9d604c8)
- [https://git.kernel.org/stable/c/7230cc456d4bb2221c20c5f1d22b38b8576aa16f](https://git.kernel.org/stable/c/7230cc456d4bb2221c20c5f1d22b38b8576aa16f)

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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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