Bug 2418801 (CVE-2025-40216) - CVE-2025-40216 kernel: io_uring/rsrc: don't rely on user vaddr alignment
Summary: CVE-2025-40216 kernel: io_uring/rsrc: don't rely on user vaddr alignment
Keywords:
Status: NEW
Alias: CVE-2025-40216
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-04 15:02 UTC by OSIDB Bzimport
Modified: 2025-12-05 17:27 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2025-12-04 15:02:11 UTC
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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