---
title: "CVE-2026-93154: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by lack of refcounting in RDMA/irdma user ring MRs, letting userspace potentially deregister memory regions backing QP/CQ/SRQ rings, exploit requires userspace access."
url: https://panop.io/threat-heartbeat/CVE-2026-93154/
---

# CVE-2026-93154 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by lack of refcounting in RDMA/irdma user ring MRs, letting userspace potentially deregister memory regions backing QP/CQ/SRQ rings, exploit requires userspace access.

CVSS base score 7.8 /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-2026-93154)

## Details

Type

Use After Free

Impact

Privilege Escalation, 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

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with refcounting fix for RDMA/irdma user ring MRs.

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-2026-93154](https://nvd.nist.gov/vuln/detail/CVE-2026-93154)
- [https://git.kernel.org/stable/c/a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b](https://git.kernel.org/stable/c/a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b)
- [https://git.kernel.org/stable/c/f67d8a08f60c9217df6d40da56422d2049f5e334](https://git.kernel.org/stable/c/f67d8a08f60c9217df6d40da56422d2049f5e334)
- [https://git.kernel.org/stable/c/07974c267f603a76aead348bca97deee95efdcc9](https://git.kernel.org/stable/c/07974c267f603a76aead348bca97deee95efdcc9)

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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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