---
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: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635 <
    6b15fc9bc117fb6597fa1c2cc30284aafe71101c
  - >-
    Linux >= 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635 <
    373f3716a2de7adc739269ebb4d87e5bf4dc180c
  - Linux 4.8
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:46.050'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90417'
references:
  - 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
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.795Z'
epss: 0.00198
epssPercentile: 0.08451
---

## 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.