Information Published on the Bad Epoll Vulnerability (CVE-2026-46242)

A repository titled “Bad Epoll,” dedicated to a vulnerability assigned the identifier CVE-2026-46242, has been published on GitHub.

The name itself points to the problem being connected with epoll — the file-descriptor monitoring mechanism widely used in Linux for efficient handling of I/O events. By all appearances, it is precisely this mechanism around which the vulnerability described in the repository is built.

At the time this news was published, no additional information is provided — neither about the nature of the vulnerability, nor about the affected versions, nor about the possible consequences of exploitation. The material is accompanied only by a discussion in the community comments, which in itself testifies to the interest in the topic among security specialists.

Those wishing to familiarize themselves with the details can turn directly to the project's repository, where a more detailed technical description will presumably appear over time.

For now, all that remains is to await official clarifications — both from the authors of the finding and from the Linux kernel maintainers, should the problem indeed affect this subsystem.

Source: Lobsters