Integer Overflow in Linux Kernel iomap_write_delalloc_scan on 32-bit Systems

Publication date: 2025-12-30

Last updated on: 2026-02-26

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: iomap: Fix possible overflow condition in iomap_write_delalloc_scan folio_next_index() returns an unsigned long value which left shifted by PAGE_SHIFT could possibly cause an overflow on 32-bit system. Instead use folio_pos(folio) + folio_size(folio), which does this correctly.

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Meta Information

Published

2025-12-30

Last Modified

2026-02-26

Generated

2026-07-07

AI Q&A

2025-12-30

EPSS Evaluated

2026-07-05

NVD

CVE-2023-54285

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.2 (inc) to 6.5.5 (exc)
linux	linux_kernel	From 6.1.92 (inc) to 6.1.162 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is a possible overflow condition in the Linux kernel's iomap_write_delalloc_scan function. It occurs because folio_next_index() returns an unsigned long value that, when left shifted by PAGE_SHIFT on a 32-bit system, could cause an overflow. The fix involves using folio_pos(folio) + folio_size(folio) instead, which correctly handles the calculation without overflow.

Impact Analysis

The vulnerability could potentially lead to incorrect memory handling or data corruption due to the overflow condition in the kernel's iomap_write_delalloc_scan function on 32-bit systems. This might affect system stability or security, but specific impacts are not detailed in the provided information.

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