---
title: "CVE-2026-89533: Linux Kernel - Integer Overflow"
description: "Linux kernel contains an integer underflow and arithmetic defect in svcrdma's svc_rdma_read_chunk_range function, caused by incorrect offset handling in segment length calculation, letting attackers trigger excessive memory allocation, exploit requires crafted RDMA read chunks."
url: https://panop.io/threat-heartbeat/CVE-2026-89533/
---

# CVE-2026-89533 Linux Kernel - Integer Overflow

Linux kernel contains an integer underflow and arithmetic defect in svcrdma's svc\_rdma\_read\_chunk\_range function, caused by incorrect offset handling in segment length calculation, letting attackers trigger excessive memory allocation, exploit requires crafted RDMA read chunks.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.50% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89533)

## Details

Type

Integer Overflow

Impact

Denial Of Service

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89533](https://nvd.nist.gov/vuln/detail/CVE-2026-89533)
- [https://git.kernel.org/stable/c/10873311f91db9454e2fadbf9866bc819e0646d9](https://git.kernel.org/stable/c/10873311f91db9454e2fadbf9866bc819e0646d9)
- [https://git.kernel.org/stable/c/addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7](https://git.kernel.org/stable/c/addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7)
- [https://git.kernel.org/stable/c/cba8543c18cf42fd80fd63effb6df6ff4f7e73ce](https://git.kernel.org/stable/c/cba8543c18cf42fd80fd63effb6df6ff4f7e73ce)
- [https://git.kernel.org/stable/c/4493c96bbd0068fadf69cbae8d13426202e34cdc](https://git.kernel.org/stable/c/4493c96bbd0068fadf69cbae8d13426202e34cdc)
- [https://git.kernel.org/stable/c/4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e](https://git.kernel.org/stable/c/4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e)
- [https://git.kernel.org/stable/c/6ee4dc7476b3abc92ec1d444533a559f33f59561](https://git.kernel.org/stable/c/6ee4dc7476b3abc92ec1d444533a559f33f59561)
- [https://git.kernel.org/stable/c/a46b35f213c2426f5d6a0458a8f7e873fc59cdfd](https://git.kernel.org/stable/c/a46b35f213c2426f5d6a0458a8f7e873fc59cdfd)

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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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