What is CVE-2026-43074?

CVE-2026-43074 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 6.4 onward and patched in 6.6.136, 6.12.83, 6.18.24 and others. CVE-2026-43074 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43074?

CVE-2026-43074 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-43074?

Yes, CVE-2026-43074 has been patched. Fixed versions include 6.6.136, 6.12.83, 6.18.24 and others. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43074 actively exploited?

CVE-2026-43074 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2026-43074

High

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.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-06-01

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-401

CVE-2026-43074 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.4 and later are affected. Fixed in 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0 and their respective stable series.

Affected from

≥ 6.4

Fixed in

✓ 6.6.136 6.6.x ✓ 6.12.83 6.12.x ✓ 6.18.24 6.18.x ✓ 6.19.14 6.19.x ✓ 7.0

References

7 total

Kernel Git
https://git.kernel.org/stable/c/07712db80857d5d09ae08f3df85a708ecfc3b61f

Patch
Kernel Git
https://git.kernel.org/stable/c/5b1173b165421561db29f30afc7e97d940a398a9

Patch
Kernel Git
https://git.kernel.org/stable/c/7e8083f5eeedab0f460063b9c2c14c9a4e71a427

Patch
Kernel Git
https://git.kernel.org/stable/c/a6566cd33f6f967a7651ebf2ce0dd31572e319cf

Patch
Kernel Git
https://git.kernel.org/stable/c/ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2026-43074

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-06-01

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43074?

CVE-2026-43074 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 6.4 onward and has been patched in 6.6.136, 6.12.83, 6.18.24 and others. CVE-2026-43074 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43074?

CVE-2026-43074 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-43074?

Yes. CVE-2026-43074 has been patched. Fixed versions include 6.6.136, 6.12.83, 6.18.24 and others. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43074 actively exploited?

No. CVE-2026-43074 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.