PT-2026-51909 · Linux · Linux

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-53015

Mitre

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

Related Identifiers

CVE-2026-53015

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-53015 · Security Note
• https://git.kernel.org/stable/c/582b0bf201157632cb5474c885989a6ebda46521 · Note
• https://git.kernel.org/stable/c/2d8c7edcb661812249469f4a5b62e9339118846f · Note
• https://git.kernel.org/stable/c/4fc9b12e43a3f19a01a8fb61f7961be79de20253 · Note
• https://git.kernel.org/stable/c/858e4d98a86adf34584767388deb6c9b217f70c5 · Note