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CVE-2023-54285

iomap: Fix possible overflow condition in iomap_write_delalloc_scan

HIGH
7.8
CVSS Score
Published: December 30, 2025 at 12:23 PM UTC
Updated: October 15, 2026 at 10:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.1.92 ≤ v < 6.1.1626.2 ≤ v < 6.5.538be53c3fd7f4f4bd5de319a323d72f9f6beb16d6.1.926.2f43dc4dc3eff028b5ddddd99f3a66c5a6bdd4e78
Vendor states this is fixed in 0c6cf409093f307ee05114f834516730c0da5b21 (fixed)
Vendor states this is fixed in 5c281b0c5d18c8eeb1cfd5023f4adb153e6d1240 (fixed)
Vendor states this is fixed in eee2d2e6ea5550118170dbd5bb1316ceb38455fb (fixed)
Vendor states this is fixed in 6.1.162 (unaffected)
Vendor states this is fixed in 6.2 (unaffected)
Vendor states this is fixed in 6.5.5 (unaffected)
Vendor states this is fixed in 6.6 (unaffected)

References (3)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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