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CVE-2026-43438

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Remove redundant css_put() in scx_cgroup_init() The iterator css_for_each_descendant_pre() walks the cgroup hierarch…

Published May 8, 2026CWE-416EPSS 0.17%

Overview

CVE-2026-43438 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

sched_ext: Remove redundant css_put() in scx_cgroup_init()

The iterator css_for_each_descendant_pre() walks the cgroup hierarchy

under cgroup_lock(). It does not increment the reference counts on

yielded css structs.

According to the cgroup documentation, css_put() should only be used

to release a reference obtained via css_get() or css_tryget_online().

Since the iterator does not use either of these to acquire a reference,

calling css_put() in the error path of scx_cgroup_init() causes a

refcount underflow.

Remove the unbalanced css_put() to prevent a potential Use-After-Free

(UAF) vulnerability.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1336b579f6079fb8520be03624fcd9ba443c930bRefgit.kernel.org/stable/c/6eaaa67d6998f6c30c462b140db8c062e07ec473Refgit.kernel.org/stable/c/bf50f3285eda8a0173625fcdb5f183f96e1008cdRefgit.kernel.org/stable/c/cc095cd305fddbe25a968e4a78436ff9476cf0f6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43438?

CVE-2026-43438 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43438?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43438?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43438?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43438 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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