What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-10-15
• Weakness: CWE-787

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.

Affected products

• Linux kernel: from 6.1.92 before 6.1.162; from 6.2 before 6.5.5 — fixed in 6.1.162, 6.5.5

How to fix

Upgrade to a fixed version: Linux kernel 6.1.162, 6.5.5. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2023-54285 or the next vulnerability affects your stack