---
id: CVE-2026-98921
title: 'ovl: fix UAF in ovl_do_mkdir() debug print'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ovl: fix UAF in ovl_do_mkdir() debug print

  ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir().
  Since commit fe497f0759e0 ("VFS: change vfs_mkdir() to un…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fe497f0759e0efb949f9480911d00b6045c21f50 <
    719bd33ab359c539a68a278c15a97deb77565cdb
  - >-
    Linux >= fe497f0759e0efb949f9480911d00b6045c21f50 <
    ae146bc1abdeb4607abf2975b858c053024e8ac1
  - Linux 6.19
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T12:05:33.583Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98921'
references:
  - url: 'https://git.kernel.org/stable/c/719bd33ab359c539a68a278c15a97deb77565cdb'
  - url: 'https://git.kernel.org/stable/c/ae146bc1abdeb4607abf2975b858c053024e8ac1'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.569Z'
---

## Overview

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

ovl: fix UAF in ovl_do_mkdir() debug print

ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir().
Since commit fe497f0759e0 ("VFS: change vfs_mkdir() to unlock on
failure."), vfs_mkdir() calls end_creating() on the input dentry on
failure and may replace it on success, so the post-call %pd can
use-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled.

Print the dentry before the call and only the result afterward.

## Affected

- `Linux >= fe497f0759e0efb949f9480911d00b6045c21f50 < 719bd33ab359c539a68a278c15a97deb77565cdb`
- `Linux >= fe497f0759e0efb949f9480911d00b6045c21f50 < ae146bc1abdeb4607abf2975b858c053024e8ac1`
- `Linux 6.19`

## Remediation

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