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CVE-2026-43074

HighPublished

eventpoll: defer struct eventpoll free to RCU grace period

Published: May 6, 2026
Updated: Aug 5, 2026
Assigning CNA: Linux
Evidence observed: Aug 24, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 40.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.

Sources

badepoll-selinux-disablerExploit
Use CVE-2026-43074 to disable SELinux on Android (Linux 6.6/6.12)
bad-epollExploit
Linux kernel privilege-escalation exploit for CVE-2026-46242, a race-condition use-after-free in epoll, with 99% reliable root on desktops, servers, and Android devices.
CyberMeowfiaNSResearch
The next stage of CyberMeowfil (CVE-2026-43499 and 43074),Possibly biased toward vivo devices?

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