---
title: "CVE-2026-89904: Linux Kernel - Buffer Overflow"
description: "Linux kernel contains an array overflow caused by improper sizing of acpi_package_ids[] in LoongArch virt machine with PPTT ACPI table, letting attackers cause memory corruption, exploit requires specific hardware configuration."
url: https://panop.io/threat-heartbeat/CVE-2026-89904/
---

# CVE-2026-89904 Linux Kernel - Buffer Overflow

Linux kernel contains an array overflow caused by improper sizing of acpi\_package\_ids\[\] in LoongArch virt machine with PPTT ACPI table, letting attackers cause memory corruption, exploit requires specific hardware configuration.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.20% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89904)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Privilege Escalation

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 with the fix for acpi\_package\_ids\[\] array overflow.

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-2026-89904](https://nvd.nist.gov/vuln/detail/CVE-2026-89904)
- [https://git.kernel.org/stable/c/0195e04b1eec8fb00e2db9c5e55655a3f5e76f60](https://git.kernel.org/stable/c/0195e04b1eec8fb00e2db9c5e55655a3f5e76f60)
- [https://git.kernel.org/stable/c/2a2367d46d7a4ee4122b7a86e57125542dbbe963](https://git.kernel.org/stable/c/2a2367d46d7a4ee4122b7a86e57125542dbbe963)
- [https://git.kernel.org/stable/c/6311b8c471afa33c18adbe4eb16f862936b71ca3](https://git.kernel.org/stable/c/6311b8c471afa33c18adbe4eb16f862936b71ca3)
- [https://git.kernel.org/stable/c/d3fd094c13c6d0b74f246461ca4cf427d539c8e8](https://git.kernel.org/stable/c/d3fd094c13c6d0b74f246461ca4cf427d539c8e8)

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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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