---
title: "CVE-2026-98323: Linux kernel RDMA/siw - Out of Bounds Write"
description: "Linux kernel RDMA/siw contains an out-of-bounds write caused by incorrect header copy length calculation in siw_get_hdr(), letting attackers trigger memory corruption via fragmented extended DDP/RDMAP headers, exploit requires crafted TCP packets."
url: https://panop.io/threat-heartbeat/CVE-2026-98323/
---

# CVE-2026-98323 Linux kernel RDMA/siw - Out of Bounds Write

Linux kernel RDMA/siw contains an out-of-bounds write caused by incorrect header copy length calculation in siw\_get\_hdr(), letting attackers trigger memory corruption via fragmented extended DDP/RDMAP headers, exploit requires crafted TCP packets.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.56% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98323)

## Details

Type

Out of Bounds Write

Impact

Out Of Bounds Rw

CVSS vector

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

Published

6 October 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-2026-98323](https://nvd.nist.gov/vuln/detail/CVE-2026-98323)
- [https://git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48](https://git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48)
- [https://git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f](https://git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f)
- [https://git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d](https://git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d)
- [https://git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c](https://git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c)
- [https://git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e](https://git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e)
- [https://git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7](https://git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7)
- [https://git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742](https://git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742)
- [https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411](https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411)

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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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