cve 2025 40051

About this tag
CVE-2025-40051 is a Linux kernel vulnerability in the vhost/vringh code that was addressed by a patch tightening return value checks for copy_from_iter and copy_to_iter. The fix changes the test from checking for a negative result to verifying that exactly the requested number of bytes were copied, closing a correctness gap that could allow malformed or partial copies to be misinterpreted and produce unpredictable kernel behavior. This tag covers discussions and analysis of the CVE-2025-40051 patch, its impact on kernel stability, and the technical details of the vhost virtualization subsystem fix.

  1. CVE-2025-40051: Linux Kernel vhost vringh Copy Fix Ensures Exact Byte Transfers

    The Linux kernel recently received a small but important patch labelled under CVE‑2025‑40051 that tightens how the vhost/vringh code checks return values from copy_from_iter and copy_to_iter; the fix changes the test from “is the result negative” to “did we copy exactly the number of bytes...
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    • cve 2025 40051 kernel security linux kernel vhost vringh
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