---
id: CVE-2026-98323
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/siw: Bound fragmented header copies by the remaining length

  siw_get_hdr() can receive an extended DDP/RDMAP header across more than
  one TCP callback
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/siw: Bound fragmented header copies by the remaining length

  siw_get_hdr() can receive an extended DDP/RDMAP header across more than
  one TCP callback. The first ca…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e3917c85f41ef1df64e27dc0e46ab0d803c5e73e <
    2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7
  - >-
    Linux >= 308cd50f174c95a507527037f4de1a0396aa4325 <
    af9f5b474a260ad23ffb9793d716a5e3bbce3b48
  - >-
    Linux >= 754209850df8367c954ac1de7671c7430b1f342c <
    262dcd809723723ed8a4e05437ec7e9c21a8f17e
  - >-
    Linux >= 754209850df8367c954ac1de7671c7430b1f342c <
    eb4d7a946970469b3ab0c762432bf161d5b0836c
  - >-
    Linux >= 754209850df8367c954ac1de7671c7430b1f342c <
    8628f8ebf41669302513fb3f0bf0eba38b226742
  - >-
    Linux >= 754209850df8367c954ac1de7671c7430b1f342c <
    b72dcfb9bf1f0f0147cda03dc59e4002a315067f
  - >-
    Linux >= 754209850df8367c954ac1de7671c7430b1f342c <
    e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d
  - >-
    Linux >= 754209850df8367c954ac1de7671c7430b1f342c <
    9ff797e516dbc1ecb73701ec4c24055712d44411
  - Linux e09caa38e10bcf027100cc22b0e3cc745a39ef0a
  - Linux 0c14f795a9eab9344230f9933798b8ee496f497d
  - Linux 7fada7c6962219b6fc4ff4e62e46a936af110dd9
  - Linux >= 5.10.150 < 5.10.271
  - Linux >= 5.15.75 < 5.15.222
  - Linux >= 5.4.220 < 5.5
  - Linux >= 5.19.17 < 5.20
  - Linux >= 6.0.3 < 6.1
  - Linux 6.1
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T09:18:24.403'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98323'
references:
  - url: 'https://git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T08:50:17.407Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

RDMA/siw: Bound fragmented header copies by the remaining length

siw_get_hdr() can receive an extended DDP/RDMAP header across more than
one TCP callback. The first callback may receive most of the header,
while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead
of the number of missing bytes. This makes the destination move past the
end of the header and overwrite the receive state, including
fpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd
value as a copy offset, which creates an OOB write.

Use the number of header bytes already received when calculating the
next copy length.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.