---
id: CVE-2026-90219
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cxgb4: Free debugfs on registration failure

  c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via
  setup_debugfs()), but it is removed only in c4…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cxgb4: Free debugfs on registration failure

  c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via
  setup_debugfs()), but it is removed only in c4…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    459b59f7ed56511d6529311cb4e5e482ebfcfb8e
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    c332d9e7dce234d8bef78271d003a68ee943b61b
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    f98e894ec029a752cf9c7f7834741bead0fb463d
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    479a7f90060e62bdd9bb4036ec0a70bf460f6d23
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    046425412529dbfca1433c8bef5641b271b4ab2a
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    ea41b5630fa3d9877ce9ed8832cf5575f742bfbb
  - >-
    Linux >= 49ea0c036ede81f126f1a9389d377999fdf5c5a1 <
    fe5c16bb6252dea6025b748257ddc3b2665495b0
  - Linux 98fa991017981b52dcc4dc3924fc8e1e83e41bf4
  - Linux af92e4a595e006b498c44b617ea38f697eca3469
  - Linux 9c0cec79e5c914662c2cf98b4a729c0fcc8c872e
  - Linux >= 4.19.130 < 4.20
  - Linux >= 5.4.49 < 5.5
  - Linux >= 5.7.6 < 5.8
  - Linux 5.8
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:17.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90219'
references:
  - url: 'https://git.kernel.org/stable/c/046425412529dbfca1433c8bef5641b271b4ab2a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/459b59f7ed56511d6529311cb4e5e482ebfcfb8e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/479a7f90060e62bdd9bb4036ec0a70bf460f6d23'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c332d9e7dce234d8bef78271d003a68ee943b61b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ea41b5630fa3d9877ce9ed8832cf5575f742bfbb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f98e894ec029a752cf9c7f7834741bead0fb463d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fe5c16bb6252dea6025b748257ddc3b2665495b0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.855Z'
epss: 0.00221
epssPercentile: 0.1292
---

## Overview

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

RDMA/cxgb4: Free debugfs on registration failure

c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via
setup_debugfs()), but it is removed only in c4iw_remove(), not in
c4iw_dealloc().  When RDMA device registration fails, the registration
worker's err_dealloc_ctx path calls c4iw_dealloc() directly, bypassing
c4iw_remove(), so the debugfs dentries leak and outlive the freed
c4iw_dev.

Move debugfs_remove_recursive() into c4iw_dealloc() so every path that
frees ctx->dev also removes its debugfs tree.

## Remediation

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