CVE-2026-53015
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
Affected versions
Linux kernel versions
5.3
and later are affected. Fixed in
6.12.91,
6.18.33,
7.0.10,
7.1
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-53015?
CVE-2026-53015 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.3 onward and has been patched in 6.12.91, 6.18.33, 7.0.10 and others. CVE-2026-53015 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-53015?
Yes — CVE-2026-53015 has been patched. Fixed versions include 6.12.91, 6.18.33, 7.0.10 and others. If you are running Linux kernel 5.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-53015 actively exploited?
No — CVE-2026-53015 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.