---
title: "CVE-2026-89910: Linux Kernel - Undefined Behavior & Denial of Service"
description: "Linux kernel contains an uninitialized stack variable issue in KVM LoongArch dmsintc_inject_irq function, letting attackers potentially cause undefined behavior or denial of service, exploit requires local access."
url: https://panop.io/threat-heartbeat/CVE-2026-89910/
---

# CVE-2026-89910 Linux Kernel - Undefined Behavior & Denial of Service

Linux kernel contains an uninitialized stack variable issue in KVM LoongArch dmsintc\_inject\_irq function, letting attackers potentially cause undefined behavior or denial of service, exploit requires local access.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.15% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89910)

## Details

Type

Undefined Behavior

Impact

Denial Of Service

CVSS vector

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

Published

16 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-2026-89910](https://nvd.nist.gov/vuln/detail/CVE-2026-89910)
- [https://git.kernel.org/stable/c/81aa3a58b542ed88819115c80a17acd86eacb89d](https://git.kernel.org/stable/c/81aa3a58b542ed88819115c80a17acd86eacb89d)
- [https://git.kernel.org/stable/c/f56060b0e10fa5633fac1dc243a25da3a5cdafb1](https://git.kernel.org/stable/c/f56060b0e10fa5633fac1dc243a25da3a5cdafb1)

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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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