---
id: CVE-2025-38072
title: 'libnvdimm/labels: Fix divide error in nd_label_data_init()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  libnvdimm/labels: Fix divide error in nd_label_data_init()

  If a faulty CXL memory device returns a broken zero LSA size in its
  memory device information (Identify Memo…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    396c46d3f59a18ebcc500640e749f16e197d472b
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    f49c337037df029440a8390380dd35d2cf5924d3
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    db1aef51b8e66a77f76b1250b914589c31a0a0ed
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    ea3d95e05e97ea20fd6513f647393add16fce3b2
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    1d1e1efad1cf049e888bf175a5c6be85d792620c
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    e14347f647ca6d76fe1509b6703e340f2d5e2716
  - >-
    Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c <
    ef1d3455bbc1922f94a91ed58d3d7db440652959
  - Linux 4.20
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:49:14.375753Z'
published: '2025-06-18'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:52:14.942Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38072'
references:
  - url: 'https://git.kernel.org/stable/c/2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca'
  - url: 'https://git.kernel.org/stable/c/396c46d3f59a18ebcc500640e749f16e197d472b'
  - url: 'https://git.kernel.org/stable/c/f49c337037df029440a8390380dd35d2cf5924d3'
  - url: 'https://git.kernel.org/stable/c/db1aef51b8e66a77f76b1250b914589c31a0a0ed'
  - url: 'https://git.kernel.org/stable/c/ea3d95e05e97ea20fd6513f647393add16fce3b2'
  - url: 'https://git.kernel.org/stable/c/1d1e1efad1cf049e888bf175a5c6be85d792620c'
  - url: 'https://git.kernel.org/stable/c/e14347f647ca6d76fe1509b6703e340f2d5e2716'
  - url: 'https://git.kernel.org/stable/c/ef1d3455bbc1922f94a91ed58d3d7db440652959'
tags:
  - cve.org
epss: 0.00222
epssPercentile: 0.12804
ingestedAt: '2026-11-05T22:38:31.917Z'
---

## Overview

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

libnvdimm/labels: Fix divide error in nd_label_data_init()

If a faulty CXL memory device returns a broken zero LSA size in its
memory device information (Identify Memory Device (Opcode 4000h), CXL
spec. 3.1, 8.2.9.9.1.1), a divide error occurs in the libnvdimm
driver:

 Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI
 RIP: 0010:nd_label_data_init+0x10e/0x800 [libnvdimm]

Code and flow:

1) CXL Command 4000h returns LSA size = 0
2) config_size is assigned to zero LSA size (CXL pmem driver):

drivers/cxl/pmem.c:             .config_size = mds->lsa_size,

3) max_xfer is set to zero (nvdimm driver):

drivers/nvdimm/label.c: max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);

4) A subsequent DIV_ROUND_UP() causes a division by zero:

drivers/nvdimm/label.c: /* Make our initial read size a multiple of max_xfer size */
drivers/nvdimm/label.c: read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer,
drivers/nvdimm/label.c-                 config_size);

Fix this by checking the config size parameter by extending an
existing check.

## Affected

- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < 2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca`
- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < 396c46d3f59a18ebcc500640e749f16e197d472b`
- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < f49c337037df029440a8390380dd35d2cf5924d3`
- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < db1aef51b8e66a77f76b1250b914589c31a0a0ed`
- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < ea3d95e05e97ea20fd6513f647393add16fce3b2`
- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < 1d1e1efad1cf049e888bf175a5c6be85d792620c`
- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < e14347f647ca6d76fe1509b6703e340f2d5e2716`
- `Linux >= 7d47aad4570e5e6e9a8162bb417ca9b74132f27c < ef1d3455bbc1922f94a91ed58d3d7db440652959`
- `Linux 4.20`

## Remediation

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