---
id: CVE-2026-23201
title: 'ceph: fix oops due to invalid pointer for kfree() in parse_longname()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ceph: fix oops due to invalid pointer for kfree() in parse_longname()

  This fixes a kernel oops when reading ceph snapshot directories (.snap),
  for example by simply ru…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4b9aee707c4580511983a0998547f3b28514e6a6 <
    c9a129c82ddf82a50b4f8960d2609714ca2dbd26
  - >-
    Linux >= bb80f7618832d26f7e395f52f82b1dac76223e5f <
    8c9af7339de419819cfc641d551675d38ff99abf
  - >-
    Linux >= 101841c38346f4ca41dc1802c867da990ffb32eb <
    e258ed369c9e04caa7d2fd49785d753ae4034cb6
  - >-
    Linux >= 101841c38346f4ca41dc1802c867da990ffb32eb <
    bc8dedae022ce3058659c3addef3ec4b41d15e00
  - Linux 3145b2b11492d61c512bbc59660bb823bc757f48
  - Linux 493479af8af3ab907f49e99323777d498a4fbd2b
  - Linux >= 6.12.42 < 6.12.70
  - Linux >= 6.15.10 < 6.16
  - Linux >= 6.16.1 < 6.17
  - Linux 6.17
published: '2026-02-14'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T11:58:12.875Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23201'
references:
  - url: 'https://git.kernel.org/stable/c/c9a129c82ddf82a50b4f8960d2609714ca2dbd26'
  - url: 'https://git.kernel.org/stable/c/8c9af7339de419819cfc641d551675d38ff99abf'
  - url: 'https://git.kernel.org/stable/c/e258ed369c9e04caa7d2fd49785d753ae4034cb6'
  - url: 'https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00'
tags:
  - cve.org
epss: 0.00118
epssPercentile: 0.01957
ingestedAt: '2026-09-14T15:23:07.459Z'
---

## Overview

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

ceph: fix oops due to invalid pointer for kfree() in parse_longname()

This fixes a kernel oops when reading ceph snapshot directories (.snap),
for example by simply running `ls /mnt/my_ceph/.snap`.

The variable str is guarded by __free(kfree), but advanced by one for
skipping the initial '_' in snapshot names. Thus, kfree() is called
with an invalid pointer.  This patch removes the need for advancing the
pointer so kfree() is called with correct memory pointer.

Steps to reproduce:

1. Create snapshots on a cephfs volume (I've 63 snaps in my testcase)

2. Add cephfs mount to fstab
$ echo "samba-fileserver@.files=/volumes/datapool/stuff/3461082b-ecc9-4e82-8549-3fd2590d3fb6      /mnt/test/stuff   ceph     acl,noatime,_netdev    0       0" >> /etc/fstab

3. Reboot the system
$ systemctl reboot

4. Check if it's really mounted
$ mount | grep stuff

5. List snapshots (expected 63 snapshots on my system)
$ ls /mnt/test/stuff/.snap

Now ls hangs forever and the kernel log shows the oops.

## Affected

- `Linux >= 4b9aee707c4580511983a0998547f3b28514e6a6 < c9a129c82ddf82a50b4f8960d2609714ca2dbd26`
- `Linux >= bb80f7618832d26f7e395f52f82b1dac76223e5f < 8c9af7339de419819cfc641d551675d38ff99abf`
- `Linux >= 101841c38346f4ca41dc1802c867da990ffb32eb < e258ed369c9e04caa7d2fd49785d753ae4034cb6`
- `Linux >= 101841c38346f4ca41dc1802c867da990ffb32eb < bc8dedae022ce3058659c3addef3ec4b41d15e00`
- `Linux 3145b2b11492d61c512bbc59660bb823bc757f48`
- `Linux 493479af8af3ab907f49e99323777d498a4fbd2b`
- `Linux >= 6.12.42 < 6.12.70`
- `Linux >= 6.15.10 < 6.16`
- `Linux >= 6.16.1 < 6.17`
- `Linux 6.17`

## Remediation

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