---
id: CVE-2026-64033
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/rtrs: Fix use-after-free in path file creation cleanup

  In the error path of rtrs_srv_create_path_files(), the sysfs root folders
  may already have been created and…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/rtrs: Fix use-after-free in path file creation cleanup

  In the error path of rtrs_srv_create_path_files(), the sysfs root folders
  may already have been created and…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.15.61, < 5.15.209'
  - 'linux_kernel >= 5.17, < 6.1.175'
  - 'linux_kernel >= 6.2, < 6.6.142'
  - 'linux_kernel >= 6.7, < 6.12.92'
  - 'linux_kernel >= 6.13, < 6.18.34'
  - 'linux_kernel >= 6.19, < 7.0.11'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.11
published: '2026-07-19'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T15:32:56.607'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64033'
references:
  - url: 'https://git.kernel.org/stable/c/00904a73272b9f3ef3952fe69a833909dccad1ef'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/01e42aabaf7632beb4bf235c7238b96c746d4144'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/548f3956e53a7f7bde912d8129010b8986d5e602'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5b74373390113fba798a76b483837029ab010fef'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/92060ab1c5115674cf319175550f85f68405121f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0e9706fb2859064bb6c677554c4d20c713aa8e0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eae62c5451e67e8b033c1681fd3b85d7e9a9a28f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00488
epssPercentile: 0.40337
ingestedAt: '2026-10-13T16:35:46.699Z'
---

## Overview

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

RDMA/rtrs: Fix use-after-free in path file creation cleanup

In the error path of rtrs_srv_create_path_files(), the sysfs root folders
may already have been created and srv_path->kobj may already have been
initialized. If a later step fails, the cleanup currently calls
kobject_put(&srv_path->kobj) before
rtrs_srv_destroy_once_sysfs_root_folders(srv_path).

kobject_put() may drop the last reference to srv_path->kobj and invoke the
release callback, rtrs_srv_release(), which frees srv_path. The following
call to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then
dereferences srv_path internally to access srv_path->srv, resulting in a
use-after-free.

This failure path is reached before rtrs_srv_create_path_files() returns
success, so the successful-path lifetime handling is not involved.

Fix this by destroying the sysfs root folders before calling
kobject_put(&srv_path->kobj), so srv_path is still valid while the helper
accesses it.

This issue was found by a static analysis tool I am developing.

## Affected

- `linux_kernel >= 5.15.61, < 5.15.209`
- `linux_kernel >= 5.17, < 6.1.175`
- `linux_kernel >= 6.2, < 6.6.142`
- `linux_kernel >= 6.7, < 6.12.92`
- `linux_kernel >= 6.13, < 6.18.34`
- `linux_kernel >= 6.19, < 7.0.11`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.11`