---
title: "CVE-2026-89856: Linux Kernel qla2xxx - Integer Overflow"
description: "Linux kernel qla2xxx driver contains an integer truncation vulnerability caused by improper clamping of MSI-X derived queue counts, letting attackers cause memory corruption or kernel crash, exploit requires a misconfigured or malicious hot-plugged device."
url: https://panop.io/threat-heartbeat/CVE-2026-89856/
---

# CVE-2026-89856 Linux Kernel qla2xxx - Integer Overflow

Linux kernel qla2xxx driver contains an integer truncation vulnerability caused by improper clamping of MSI-X derived queue counts, letting attackers cause memory corruption or kernel crash, exploit requires a misconfigured or malicious hot-plugged device.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89856)

## Details

Type

Integer Overflow

Impact

Denial Of Service

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for clamping MSI-X queue counts.

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-2026-89856](https://nvd.nist.gov/vuln/detail/CVE-2026-89856)
- [https://git.kernel.org/stable/c/802068b9b683b8008fcccbf6e9ad133e597ec87c](https://git.kernel.org/stable/c/802068b9b683b8008fcccbf6e9ad133e597ec87c)
- [https://git.kernel.org/stable/c/9eeddbeaa896f39d943644b16d83a6ad0ceab255](https://git.kernel.org/stable/c/9eeddbeaa896f39d943644b16d83a6ad0ceab255)
- [https://git.kernel.org/stable/c/cf623d32761b00f221a9cfded3303d56e84b429d](https://git.kernel.org/stable/c/cf623d32761b00f221a9cfded3303d56e84b429d)
- [https://git.kernel.org/stable/c/e80adfeac61b4d5db7ffe0f5af43999c33a4145e](https://git.kernel.org/stable/c/e80adfeac61b4d5db7ffe0f5af43999c33a4145e)
- [https://git.kernel.org/stable/c/ebfd35c64433821bd5619a6d07ccc2df8b5b1de3](https://git.kernel.org/stable/c/ebfd35c64433821bd5619a6d07ccc2df8b5b1de3)
- [https://git.kernel.org/stable/c/2efe50b2da829909023de4a2eb87badb7cfa53cc](https://git.kernel.org/stable/c/2efe50b2da829909023de4a2eb87badb7cfa53cc)
- [https://git.kernel.org/stable/c/33c77254e6e91f37c72c7fad4051777452b10de8](https://git.kernel.org/stable/c/33c77254e6e91f37c72c7fad4051777452b10de8)
- [https://git.kernel.org/stable/c/7a448f5ed0b283dbde4e9183dd1e98c221432dab](https://git.kernel.org/stable/c/7a448f5ed0b283dbde4e9183dd1e98c221432dab)

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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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