CVE-2023-54285 iomap: Fix possible overflow condition in iomap_write_delalloc_scan

What is CVE-2023-54285?

CVE-2023-54285 is a high-severity vulnerability in Linux kernel, published on 30 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-787

Which versions are affected by CVE-2023-54285?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-54285?

Apply the vendor's patch.

Is CVE-2023-54285 being exploited?

There is no known exploitation of CVE-2023-54285 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-54285, DEBIAN-CVE-2023-54285, GHSA-wfvh-f2f6-f56w, ROOT-OS-UBUNTU-2204-CVE-2023-54285, UBUNTU-CVE-2023-54285.