---
id: CVE-2026-90417
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cxgb4: Fix dereg_skb leak and double free in write_tpt_entry()

  When the device is in the fatal error state, write_tpt_entry() returns -EIO
  before handing the call…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cxgb4: Fix dereg_skb leak and double free in write_tpt_entry()

  When the device is in the fatal error state, write_tpt_entry() returns -EIO
  before handing the call…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635 <
    6b15fc9bc117fb6597fa1c2cc30284aafe71101c
  - >-
    Linux >= 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635 <
    373f3716a2de7adc739269ebb4d87e5bf4dc180c
  - Linux 4.8
published: '2026-09-17'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:18:02.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90417'
references:
  - url: 'https://git.kernel.org/stable/c/2fcd26f4680143e9ec477069530548dbe20fce6f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/373f3716a2de7adc739269ebb4d87e5bf4dc180c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6b15fc9bc117fb6597fa1c2cc30284aafe71101c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90417.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90417'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536483'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90417'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90417'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90417.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-90417'
  - url: 'https://git.kernel.org/stable/c/68c1d2c085f205e8a5338bc3d3304f897deca4d9'
  - url: 'https://git.kernel.org/stable/c/379cf06e6fe34af980064c6ccaf15d8e26ec4a42'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00213
epssPercentile: 0.11562
ingestedAt: '2026-09-17T16:21:47.795Z'
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-401
---

## Overview

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

RDMA/cxgb4: Fix dereg_skb leak and double free in write_tpt_entry()

When the device is in the fatal error state, write_tpt_entry() returns -EIO
before handing the caller's preallocated skb to the transmit path; its
allocation-failure returns do the same. c4iw_dereg_mr() ignores the error
and frees mhp, leaking mhp->dereg_skb. c4iw_get_dma_mr() instead frees the
skb a second time after dereg_mem() already consumed it, a double free.

Make write_tpt_entry() the sole owner of a non-NULL skb, freeing it on
every return preceding handoff to c4iw_ofld_send(): fatal error, tpt and
stag allocation failure. c4iw_ofld_send() consumes the skb on success and
error alike, so drop the redundant kfree_skb() in c4iw_get_dma_mr() after
dereg_mem().

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90417.json)