CVE-2026-53015 Details
Description
In the Linux kernel, the following vulnerability has been resolved: erofs: unify lcn as u64 for 32-bit platforms As sashiko reported [1], `lcn` was typed as `unsigned long` (or `unsigned int` sometimes), which is only 32 bits wide on 32-bit platforms, which causes `(lcn << lclusterbits)` to be truncated at 4 GiB. In order to consolidate the logic, just use `u64` consistently around the codebase. [1] https://sashiko.dev/r/20260420034612.1899973-1-hsiangkao%40linux.alibaba.com
A vulnerability exists in the Linux kernel's EROFS (Enhanced Read-Only File System) component, specifically related to the handling of long cluster numbers (LCNs) on 32-bit platforms. The issue arises because LCNs were defined as 'unsigned long' or 'unsigned int', which are only 32 bits wide on 32-bit systems. This limitation causes LCN values to be truncated when shifted, leading to potential data mismanagement. The vulnerability has been addressed by standardizing the LCN type to 'u64' across the codebase, ensuring proper handling of larger values and preventing truncation.
Users can upgrade to the patched version of the Linux kernel where this vulnerability has been addressed. The patch is available in the Linux kernel stable tree.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/2d8c7edcb661812249469f4a5b62e9339118846f | kernel.org | Patch |
| https://git.kernel.org/stable/c/4fc9b12e43a3f19a01a8fb61f7961be79de20253 | kernel.org | Patch |
| https://git.kernel.org/stable/c/582b0bf201157632cb5474c885989a6ebda46521 | kernel.org | Patch |
| https://git.kernel.org/stable/c/858e4d98a86adf34584767388deb6c9b217f70c5 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.3, < 6.12.91 >= 6.13, < 6.18.33 >= 6.19, < 7.0.10 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | Initial Analysis | [email protected] |
| Jun 24, 2026 | New CVE Received | kernel.org |