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CVE-2026-43313

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() In acpi_processor_errata_piix4(), the pointer de…

Published May 8, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-43313 is a medium-severity vulnerability. It was published on May 8, 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 NULL-pointer dereference in acpi_processor_errata_piix4()

In acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE

device and then reassigned an ISA device:

dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...);

dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...);

If the first lookup succeeds but the second fails, dev becomes NULL. This

leads to a potential null-pointer dereference when dev_dbg() is called:

if (errata.piix4.bmisx)

dev_dbg(&dev->dev, ...);

To prevent this, use two temporary pointers and retrieve each device

independently, avoiding overwriting dev with a possible NULL value.

[ rjw: Subject adjustment, added an empty code line ]

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/01e8751b37a366b1ca561add0042f2ceb18c03bfRefgit.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5Refgit.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5Refgit.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05Refgit.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254Refgit.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033Refgit.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43313?

CVE-2026-43313 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43313?

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-2026-43313?

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-2026-43313?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43313 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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