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CVE-2025-40216

io_uring/rsrc: don't rely on user vaddr alignment

HIGH
7.8
CVSS Score
Published: December 4, 2025 at 02:14 PM UTC
Updated: October 19, 2026 at 09:10 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
6.12a8edbb424b1391b077407c75d8f5d2ede77aa70d
Vendor states this is fixed in 3a3c6d61577dbb23c09df3e21f6f9eda1ecd634b (fixed)
Vendor states this is fixed in 50998b0ae7d9d552e96d8b7239981cf05f65eff5 (fixed)
Vendor states this is fixed in f16769241594be59387b56ab525e327f54377e60 (fixed)
Vendor states this is fixed in 6.12 (unaffected)
Vendor states this is fixed in 6.12.36 (unaffected)
Vendor states this is fixed in 6.15.5 (unaffected)
Vendor states this is fixed in 6.16 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusDEFERRED

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