sr iov

About this tag
SR-IOV (Single Root I/O Virtualization) is a hardware virtualization feature that allows a single PCIe device to present multiple virtual functions (VFs) to virtual machines or containers. On WindowsForum.com, recent discussions focus on Linux kernel vulnerabilities affecting SR-IOV implementations, including CVE-2026-46142 in the Wangxun libwx driver, CVE-2026-46132 in rtnetlink, CVE-2025-54567 in QEMU, CVE-2025-38104 in AMDGPU, and CVE-2025-40219 in PCI/IOV code. These threads highlight race conditions, memory leaks, register mishandling, and locking gaps that can cause system hangs, information disclosure, or crashes. While the bugs are in Linux, they impact Windows shops running mixed virtualization stacks, Hyper-V, WSL, or Azure. The tag covers SR-IOV reliability, security patches, and cross-platform virtualization lessons.

  1. CVE-2026-46142 libwx SR-IOV VF Hang: Small Patch, Big Virtualization Lesson

    CVE-2026-46142 is a newly published Linux kernel vulnerability, received by NVD on May 28, 2026 from kernel.org, affecting the Wangxun libwx Ethernet driver when a virtual function reads a physical-function-only register during initialization and can hang the system. The fix is small, but the...
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    • cve 2026 46142 linux kernel nic drivers sr iov
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  2. CVE-2026-46132 Linux Kernel Info Leak: Why Windows Teams Should Patch

    CVE-2026-46132 is a Linux kernel information-disclosure flaw published by NVD on May 28, 2026, after kernel.org reported that rtnetlink could leak up to 26 bytes of uninitialized kernel stack data per virtual function in certain SR-IOV network interface queries. The bug is not a Windows...
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    • information disclosure linux kernel rtnetlink sr iov
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    • Forum: Security Alerts

  3. CVE-2025-54567: QEMU SR-IOV VF Enable Write Mask Bug and Patch

    The QEMU SR-IOV implementation contains a subtle but meaningful bug: hw/pci/pcie_sriov.c in QEMU through 10.0.3 mishandles the VF Enable bit write mask, a logic error tracked as CVE-2025-54567 that can lead to incorrect registration/unregistration of virtual functions (VFs) and inconsistent...

  4. Linux AMDGPU CVE-2025-38104: Mutex to Spinlock Fix for RLCG Register Access

    A small but important kernel change — replacing a sleeping mutex with a non‑sleeping spinlock in the AMDGPU driver’s RLCG register access path — has been tracked as CVE‑2025‑38104 and fixed upstream to eliminate a priority‑inversion and invalid‑wait context that could trigger kernel oopses or...

  5. Linux Kernel CVE-2025-40219: Fix for SR-IOV PCI Race and Lock Gap

    A newly disclosed Linux kernel vulnerability, tracked as CVE-2025-40219, fixes a long-standing race and locking gap in the kernel’s PCI I/O virtualization (PCI/IOV) SR-IOV code: enabling and disabling SR-IOV did not take the global PCI “rescan‑remove” serialization lock, allowing concurrent...
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    • linux kernel pci virtualization security patch sr iov
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    • Forum: Security Alerts