CVE-2025-40216
Published Dec 4, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: don't rely on user vaddr alignment There is no guaranteed alignment for user pointers, however the calculation of an offset of the first page into a folio after coalescing uses some weird bit mask logic, get rid of it.
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References
Frequently Asked Questions
What is CVE-2025-40216? +
In the Linux kernel, the following vulnerability has been resolved:
io_uring/rsrc: don't rely on user vaddr alignment
There is no guaranteed alignment for user pointers, however the
calculation of an offset of the first page into a folio after coalescing
uses some weird bit mask logic, get rid of it.
How do I check if I'm vulnerable to CVE-2025-40216? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.