CVE-2026-43313 Details
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 ]
A NULL-pointer dereference vulnerability has been identified in the Linux kernel's ACPI processor handling, specifically within the 'acpi_processor_errata_piix4()' function. This issue arises when the function retrieves device information from the PCI subsystem. The function first assigns an IDE device to a pointer and then attempts to reassign it with an ISA device. If the first lookup is successful but the second fails, the pointer becomes NULL. Consequently, a NULL-pointer dereference can occur when the code attempts to log a message using 'dev_dbg()', potentially leading to a system crash.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for upgrading the Linux kernel can be found in the official Linux documentation or through the package management system of the respective Linux distribution.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf | kernel.org | Patch |
| https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.12.1, < 5.15.202 >= 5.16, < 6.1.165 >= 6.2, < 6.6.128 >= 6.7, < 6.12.75 >= 6.13, < 6.18.16 >= 6.19, < 6.19.6 2.6.12 - 2.6.12 rc2 2.6.12 rc3 2.6.12 rc4 2.6.12 rc5 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 15, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | New CVE Received | kernel.org |