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CVE-2026-23443

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: Fix previous acpi_processor_errata_piix4() fix After commi f132e089fe89 ("ACPI: processor: Fix NULL-pointer de…

Published Apr 3, 2026CWE-476EPSS 0.12%

Overview

CVE-2026-23443 is a medium-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

ACPI: processor: Fix previous acpi_processor_errata_piix4() fix

After commi f132e089fe89 ("ACPI: processor: Fix NULL-pointer dereference

in acpi_processor_errata_piix4()"), device pointers may be dereferenced

after dropping references to the device objects pointed to by them,

which may cause a use-after-free to occur.

Moreover, debug messages about enabling the errata may be printed

if the errata flags corresponding to them are unset.

Address all of these issues by moving message printing to the points

in the code where the errata flags are set.

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/2e369ba9eb7b8a06e9cc35a3e7fe73e59272f8c2Refgit.kernel.org/stable/c/68408e8f9e366ad9850a66ac65cb569f13bf6cd4Refgit.kernel.org/stable/c/8583f62259e1b315d5239371adfb36939cdab741Refgit.kernel.org/stable/c/98473309a36acc271009b85e0bb53a4c0dddf5c2Refgit.kernel.org/stable/c/bf504b229cb8d534eccbaeaa23eba34c05131e25Refgit.kernel.org/stable/c/e0c470049344e9346fff79d7e2362212c216665eRefgit.kernel.org/stable/c/edf4c2aaee08e8fd503fbae705c801e92a0b55d7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23443?

CVE-2026-23443 is a medium-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-23443?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23443?

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-2026-23443?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23443 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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