---
title: "CVE-2026-89532: Linux Kernel - Out of Bounds Read"
description: "Linux kernel contains an out-of-bounds read caused by incorrect upper bound calculation in svcrdma pcl_for_each_segment macro when processing chunks with zero segments, letting remote attackers cause a general protection fault, exploit requires crafted network packets."
url: https://panop.io/threat-heartbeat/CVE-2026-89532/
---

# CVE-2026-89532 Linux Kernel - Out of Bounds Read

Linux kernel contains an out-of-bounds read caused by incorrect upper bound calculation in svcrdma pcl\_for\_each\_segment macro when processing chunks with zero segments, letting remote attackers cause a general protection fault, exploit requires crafted network packets.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.50% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89532)

## Details

Type

Out of Bounds Read

Impact

Denial Of Service

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for svcrdma pcl\_for\_each\_segment macro.

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-2026-89532](https://nvd.nist.gov/vuln/detail/CVE-2026-89532)
- [https://git.kernel.org/stable/c/6d33a7e6bf6c6b293a266a617201285a1ad32c56](https://git.kernel.org/stable/c/6d33a7e6bf6c6b293a266a617201285a1ad32c56)
- [https://git.kernel.org/stable/c/9c5a03c3dc505c0295339b0a1b9e4fe36447e482](https://git.kernel.org/stable/c/9c5a03c3dc505c0295339b0a1b9e4fe36447e482)
- [https://git.kernel.org/stable/c/a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8](https://git.kernel.org/stable/c/a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8)
- [https://git.kernel.org/stable/c/b7713a784c59515d0aba558c8f5df6a0164dd3a9](https://git.kernel.org/stable/c/b7713a784c59515d0aba558c8f5df6a0164dd3a9)
- [https://git.kernel.org/stable/c/06d0390c37fa6714624af771bd72bbf1a7ed9bb1](https://git.kernel.org/stable/c/06d0390c37fa6714624af771bd72bbf1a7ed9bb1)
- [https://git.kernel.org/stable/c/1e2e3481e39103a386b86be1c33eaef97cbdf16e](https://git.kernel.org/stable/c/1e2e3481e39103a386b86be1c33eaef97cbdf16e)
- [https://git.kernel.org/stable/c/3a78b841879c2a3243f74edc514236fb2907167f](https://git.kernel.org/stable/c/3a78b841879c2a3243f74edc514236fb2907167f)

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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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