---
id: CVE-2026-23242
title: 'RDMA/siw: Fix potential NULL pointer dereference in header processing'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/siw: Fix potential NULL pointer dereference in header processing

  If siw_get_hdr() returns -EINVAL before set_rx_fpdu_context(),
  qp->rx_fpdu can be NULL. The error…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    ab61841633d10e56a58c1493a262f0d02dba2f5e
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    8564dcc12fbb372d984ab45768cae9335777b274
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    ab957056192d6bd068b3759cb2077d859cca01f0
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    ffba40b67663567481fa8a1ed5d2da36897c175d
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    87b7a036d2c73d5bb3ae2d47dee23de465db3355
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    714c99e1dc8f85f446e05be02ba83972e981a817
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    ce025f7f5d070596194315eb2e4e89d568b8a755
  - >-
    Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 <
    14ab3da122bd18920ad57428f6cf4fade8385142
  - Linux 5.3
published: '2026-03-18'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:45:06.774Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23242'
references:
  - url: 'https://git.kernel.org/stable/c/ab61841633d10e56a58c1493a262f0d02dba2f5e'
  - url: 'https://git.kernel.org/stable/c/8564dcc12fbb372d984ab45768cae9335777b274'
  - url: 'https://git.kernel.org/stable/c/ab957056192d6bd068b3759cb2077d859cca01f0'
  - url: 'https://git.kernel.org/stable/c/ffba40b67663567481fa8a1ed5d2da36897c175d'
  - url: 'https://git.kernel.org/stable/c/87b7a036d2c73d5bb3ae2d47dee23de465db3355'
  - url: 'https://git.kernel.org/stable/c/714c99e1dc8f85f446e05be02ba83972e981a817'
  - url: 'https://git.kernel.org/stable/c/ce025f7f5d070596194315eb2e4e89d568b8a755'
  - url: 'https://git.kernel.org/stable/c/14ab3da122bd18920ad57428f6cf4fade8385142'
tags:
  - cve.org
epss: 0.00449
epssPercentile: 0.36509
ingestedAt: '2026-09-08T15:33:26.993Z'
---

## Overview

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

RDMA/siw: Fix potential NULL pointer dereference in header processing

If siw_get_hdr() returns -EINVAL before set_rx_fpdu_context(),
qp->rx_fpdu can be NULL. The error path in siw_tcp_rx_data()
dereferences qp->rx_fpdu->more_ddp_segs without checking, which
may lead to a NULL pointer deref. Only check more_ddp_segs when
rx_fpdu is present.

KASAN splat:
[  101.384271] KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]
[  101.385869] RIP: 0010:siw_tcp_rx_data+0x13ad/0x1e50

## Affected

- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < ab61841633d10e56a58c1493a262f0d02dba2f5e`
- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < 8564dcc12fbb372d984ab45768cae9335777b274`
- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < ab957056192d6bd068b3759cb2077d859cca01f0`
- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < ffba40b67663567481fa8a1ed5d2da36897c175d`
- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < 87b7a036d2c73d5bb3ae2d47dee23de465db3355`
- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < 714c99e1dc8f85f446e05be02ba83972e981a817`
- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < ce025f7f5d070596194315eb2e4e89d568b8a755`
- `Linux >= 8b6a361b8c482f22ac99c3273285ff16b23fba91 < 14ab3da122bd18920ad57428f6cf4fade8385142`
- `Linux 5.3`

## Remediation

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