CVE-2026-43074

CVE Enrichment

CVSS: 7.8 HIGH
EPSS: 0.48%
EPSS Percentile: 41.45%
CISA KEV: Not listed

Description

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published: 06-May-2026 17:16
Last Modified: 20-Oct-2026 03:18
EPSS Date: 2026-10-28
CWE: CWE-401, CWE-416

CVSS Vector


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

Affected Products / Versions

linux / linux_kernel Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 6.4.1 · before (exclusive) 6.6.136
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 6.7 · before (exclusive) 6.12.83
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 6.13 · before (exclusive) 6.18.24
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 6.19 · before (exclusive) 6.19.14
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 6.4
cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 7.0
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 7.0
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 7.0
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 7.0
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 7.0
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 7.0
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
linux / linux_kernel Source: NVD CPE · affected
Version / affected range: 7.0
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*

References

Last enrichment sync: 29-Oct-2026 14:37
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (2)

Bad Epoll was introduced in 2023 in a commit that also introduced CVE-2026-43074, another race condition in the epoll code that was found by Anthropic’s Mythos. PoC Exploit Released for Linux Bad Epoll Root-Access Vulnerability
The bug is especially notable because it was found after Anthropic’s Mythos AI missed it in the same epoll code area where it had found CVE-2026-43074. Bad Epoll Linux Kernel Flaw Can Give Local Users Root on Linux and Android

CVE (1)

People (1)

MITRE ATT&CK (1)

Vendors (2)

Products (6)

Tools (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.