What’s Vulnerable › Vulnerabilities

CVE-2025-40216: io_uring/rsrc: don't rely on user vaddr alignment

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-04 · updated 2026-10-19

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.

Affected products

• Linux kernel: 6.12 — fixed in 6.16

How to fix

Upgrade to a fixed version: Linux kernel 6.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3a3c6d61577dbb23c09df3e21f6f9eda1ecd634b
• https://git.kernel.org/stable/c/50998b0ae7d9d552e96d8b7239981cf05f65eff5
• https://git.kernel.org/stable/c/f16769241594be59387b56ab525e327f54377e60

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