---
title: "CVE-2026-97421: Linux Kernel - Memory Corruption & Denial of Service"
description: "Linux kernel contains a vulnerability in RDMA/umem component caused by improper boundary condition checks in ib_umem_find_best_pgsz(), letting attackers cause potential memory corruption or denial of service, exploit requires crafted input triggering boundary conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-97421/
---

# CVE-2026-97421 Linux Kernel - Memory Corruption & Denial of Service

Linux kernel contains a vulnerability in RDMA/umem component caused by improper boundary condition checks in ib\_umem\_find\_best\_pgsz(), letting attackers cause potential memory corruption or denial of service, exploit requires crafted input triggering boundary conditions.

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-2026-97421)

## Details

Type

Memory Corruption

Impact

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

24 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

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-2026-97421](https://nvd.nist.gov/vuln/detail/CVE-2026-97421)
- [https://git.kernel.org/stable/c/ae3cf7d2c4d506c5c91746321644e1a08d989e2a](https://git.kernel.org/stable/c/ae3cf7d2c4d506c5c91746321644e1a08d989e2a)
- [https://git.kernel.org/stable/c/3014da7587ce006cd08004fd6b257626b314e0a3](https://git.kernel.org/stable/c/3014da7587ce006cd08004fd6b257626b314e0a3)
- [https://git.kernel.org/stable/c/ddccf6cc3861de2fe60986933bead79220e0d797](https://git.kernel.org/stable/c/ddccf6cc3861de2fe60986933bead79220e0d797)
- [https://git.kernel.org/stable/c/e9bbb5f5349ef560ff6f0395564f04c3aa664559](https://git.kernel.org/stable/c/e9bbb5f5349ef560ff6f0395564f04c3aa664559)
- [https://git.kernel.org/stable/c/09ea6837a0434fb4db99528a5055b6d822135dcf](https://git.kernel.org/stable/c/09ea6837a0434fb4db99528a5055b6d822135dcf)
- [https://git.kernel.org/stable/c/5fc5b73109540809b094710fac44da81dd8a3ff8](https://git.kernel.org/stable/c/5fc5b73109540809b094710fac44da81dd8a3ff8)

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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

Panop answers these inside your environment, for this CVE and every other finding.

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