Bug 2383430 (CVE-2025-38386)

Summary: CVE-2025-38386 kernel: Linux kernel: Denial of Service in ACPICA due to missing method arguments
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's ACPI Component Architecture (ACPICA). This vulnerability occurs when a platform firmware update increases the number of parameters for a method, but a caller fails to provide the expected number of arguments. This can lead to a use-after-free error, causing the system to crash and resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2025-07-25 14:04:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ACPICA: Refuse to evaluate a method if arguments are missing

As reported in [1], a platform firmware update that increased the number
of method parameters and forgot to update a least one of its callers,
caused ACPICA to crash due to use-after-free.

Since this a result of a clear AML issue that arguably cannot be fixed
up by the interpreter (it cannot produce missing data out of thin air),
address it by making ACPICA refuse to evaluate a method if the caller
attempts to pass fewer arguments than expected to it.
Comment 1 Jon Moroney 2025-07-25 18:34:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025072506-CVE-2025-38386-0a8a@gregkh/T