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cve recordhigh

CVE-2026-46242

linux · linux kernel

Published
CVSS7.8
Severityhigh
WeaknessCWE-416
ExploitedNot in CISA KEV

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

In the Linux kernel, the following vulnerability has been resolved: eventpoll: fix ep_remove struct eventpoll / struct file UAF ep_remove() (via ep_remove_file()) cleared file->f_ep under file->f_lock but then kept using @file inside the critical section (is_file_epoll(), hlist_del_rcu() through the head, spin_unlock). A concurrent __fput() taking the eventpoll_release() fastpath in that window observed the transient NULL, skipped eventpoll_release_file() and ran to f_op->release / file_free(). For the epoll-watches-epoll case, f_op->release is ep_eventpoll_release() -> ep_clear_and_put() -> ep_free(), which kfree()s the watched struct eventpoll. Its embedded ->refs hlist_head is exactly

References

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Our coverage of CVE-2026-46242

CVE-2026-46817high

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CVE-2026-46242

New "Bad Epoll" Linux Kernel Flaw Lets Unprivileged Users Gain Root, Hits Android

A critical vulnerability, dubbed "Bad Epoll" and identified as CVE-2026-46242, has been discovered in the Linux kernel. This flaw allows an unprivileged user to gain complete root-level control over a compromised system. The vulnerability impacts a wide range of Linux-based systems, including desktop and server distributions, as well as the Android mobile operating system. Fortunately, a patch…