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Vulnerability record · CVE-2023-54285 · published 30 December 2025

CVE-2023-54285: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.3% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
4 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0c6cf409093f307ee05114f834516730c0da5b21 Patch
https://git.kernel.org/stable/c/5c281b0c5d18c8eeb1cfd5023f4adb153e6d1240 Patch
https://git.kernel.org/stable/c/eee2d2e6ea5550118170dbd5bb1316ceb38455fb Patch

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Source: NIST National Vulnerability Database (record CVE-2023-54285), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.