Bug 2426179 (CVE-2023-54285)

Summary: CVE-2023-54285 kernel: iomap: Fix possible overflow condition in iomap_write_delalloc_scan
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-30 13:14:33 UTC 
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.
Comment 1 Alexander B 2025-12-31 03:30:35 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123027-CVE-2023-54285-edc0@gregkh/T