What is CVE-2026-43074?
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.
Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 174 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 7.8 — HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 0.1% probability of exploitation in the next 30 days, higher than 6.5% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-05-06, last modified 2026-08-05
Is CVE-2026-43074 being exploited?
Weaponised exploit code for CVE-2026-43074 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.
- PeronGH/badepoll-selinux-disabler (github)
Affected products and versions
- Linux: Linux
How to fix CVE-2026-43074
No vendor patch reference has been recorded for CVE-2026-43074 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-43074
3 tracked threats in the Threadlinqs corpus reference CVE-2026-43074, either in the campaign’s CVE list or as an indicator on the campaign record.
- CitrixBleed 2 (CVE-2025-5777) Exploited by Anubis Ransomware Affiliates Alongside Valid VPN Credentials and RMM Tool Abuse — CRITICAL · 2026-10-27
- Bad Epoll (CVE-2026-46242): Use-After-Free Zero-Day in Linux Kernel epoll Subsystem Enables Root Privilege Escalation — HIGH · 2026-07-05
- "Bad Epoll" Linux Kernel Use-After-Free (CVE-2026-46242) Enables Unprivileged Root Escalation, Impacts Android — HIGH · 2026-07-05
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .
Other references
- git.kernel.org
- git.kernel.org (a6d57084372161f86660bc4607784420e00efe2c)
- git.kernel.org (a6566cd33f6f967a7651ebf2ce0dd31572e319cf)
- git.kernel.org (5b1173b165421561db29f30afc7e97d940a398a9)
- git.kernel.org (7e8083f5eeedab0f460063b9c2c14c9a4e71a427)
Showing 5 of 7 recorded references.