---
title: "CVE-2026-89587: Linux Kernel - Buffer Overflow"
description: "Linux kernel contains a stack buffer overflow in ACPI pfr_update's query_capability() caused by unchecked memcpy of firmware-supplied buffers larger than destination arrays, letting local attackers cause memory corruption, exploit requires local access."
url: https://panop.io/threat-heartbeat/CVE-2026-89587/
---

# CVE-2026-89587 Linux Kernel - Buffer Overflow

Linux kernel contains a stack buffer overflow in ACPI pfr\_update's query\_capability() caused by unchecked memcpy of firmware-supplied buffers larger than destination arrays, letting local attackers cause memory corruption, exploit requires local access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.14% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89587)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Privilege Escalation

CVSS vector

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

Published

11 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-2026-89587](https://nvd.nist.gov/vuln/detail/CVE-2026-89587)
- [https://git.kernel.org/stable/c/c5a31b4e7e37c92550be9a2edf51ca853a4d251a](https://git.kernel.org/stable/c/c5a31b4e7e37c92550be9a2edf51ca853a4d251a)
- [https://git.kernel.org/stable/c/d3af83e327565a9444cebc0db714cb837e493046](https://git.kernel.org/stable/c/d3af83e327565a9444cebc0db714cb837e493046)
- [https://git.kernel.org/stable/c/15d2b7f38f95d28652170344f39ee492c55e567c](https://git.kernel.org/stable/c/15d2b7f38f95d28652170344f39ee492c55e567c)
- [https://git.kernel.org/stable/c/6d4ed2fd022bc862b156e53aae163b61259e1caa](https://git.kernel.org/stable/c/6d4ed2fd022bc862b156e53aae163b61259e1caa)
- [https://git.kernel.org/stable/c/a2151624b55029dad0ca7efd17fb83a0461c8843](https://git.kernel.org/stable/c/a2151624b55029dad0ca7efd17fb83a0461c8843)
- [https://git.kernel.org/stable/c/ced45be0073a8a31b30b4a7f68cd3a15734515de](https://git.kernel.org/stable/c/ced45be0073a8a31b30b4a7f68cd3a15734515de)

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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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