Bug 2541429 (CVE-2026-100072)

Summary: CVE-2026-100072 kernel: ACPI: platform: Use acpi_bus_get_primary_device()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's ACPI (Advanced Configuration and Power Interface) subsystem. This vulnerability can lead to a Denial of Service (DoS) or system instability due to unsafe reference handling during platform device creation. Because the kernel fails to acquire a reference to the physical device node, the device could be freed while still being accessed. A local user could trigger this use-after-free condition to crash the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-25 13:37:58 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ACPI: platform: Use acpi_bus_get_primary_device()

The acpi_get_first_physical_node() usage in acpi_platform_fill_resource()
and acpi_create_platform_device() is generally unsafe because in theory
the device returned by it may be freed at any time [1].

It is also inefficient because acpi_get_first_physical_node() is called
multiple times for the same argument which can be avoided.

Address these issues by using acpi_bus_get_primary_device() instead of
acpi_get_first_physical_node() and adjusting the code to call it just
once at the beginning of and acpi_create_platform_device() and drop
the device reference acquired by it upon the return from that function.
Comment 1 Mauro Matteo Cascella 2026-09-30 16:37:29 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-100072.mbox