# CVE-2025-38072: libnvdimm/labels: Fix divide error in nd\_label\_data\_init()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-06-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.20

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
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## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca
- https://git.kernel.org/stable/c/396c46d3f59a18ebcc500640e749f16e197d472b
- https://git.kernel.org/stable/c/f49c337037df029440a8390380dd35d2cf5924d3
- https://git.kernel.org/stable/c/db1aef51b8e66a77f76b1250b914589c31a0a0ed
- https://git.kernel.org/stable/c/ea3d95e05e97ea20fd6513f647393add16fce3b2
- https://git.kernel.org/stable/c/1d1e1efad1cf049e888bf175a5c6be85d792620c
- https://git.kernel.org/stable/c/e14347f647ca6d76fe1509b6703e340f2d5e2716
- https://git.kernel.org/stable/c/ef1d3455bbc1922f94a91ed58d3d7db440652959

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