epoll epoll_wait

About this tag
The epoll and epoll_wait tag on WindowsForum.com covers Linux kernel topics where epoll is used for I/O event monitoring. Tagged content includes a discussion of CVE-2026-31721, a Linux kernel vulnerability in the USB gadget HID function. The bug involves epoll-registered file descriptors surviving an unbind-and-bind cycle, leading to corrupted kernel list state. This issue is relevant to embedded Linux, test rigs, Android development, USB device emulation, and appliance systems. The content highlights lifecycle flaws in kernel drivers and the importance of proper epoll usage in event-driven systems.

  1. CVE-2026-31721: Linux USB HID gadget lifetime bug and the bind/unbind fix

    On May 1, 2026, kernel.org published CVE-2026-31721, a medium-severity Linux kernel vulnerability in the USB gadget HID function where rebinding a gadget could corrupt kernel list state after an epoll-registered /dev/hidg0 file descriptor survived the unbind-and-bind cycle. The bug is not a...
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    • cve-2026-31721 epoll epoll_wait linux kernel usb gadget hid
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    • Forum: Security Alerts