CVE-2026-93251
Low risk· EPSS 8%Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In the Linux kernel, the acpi_get_first_physical_node() function may return a stale device pointer, potentially leading to a use-after-free. A new function acpi_bus_get_primary_device() has been introduced to mitigate this issue by properly managing references.
Risk Assessment
The vulnerability could lead to memory corruption in the kernel, potentially causing system crashes or privilege escalation. However, it requires specific race conditions, so the risk is moderate.
Recommendation
It is recommended to apply the kernel patch that introduces the new function as soon as possible. Monitor your distribution for updates.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ACPI: bus: Introduce acpi_bus_get_primary_device() The function used for obtaining the first "physical" device for which the given ACPI one is the ACPI companion, acpi_get_first_physical_node(), may return a stale device pointer (mostly in theory) because acpi_unbind_one() may run as a whole after dropping the ACPI device's physical_node_lock in acpi_get_first_physical_node() and before it returns. The last reference to the "physical" device may be dropped then before the pointer to it is returned to the caller. If that happens and the acpi_get_first_physical_node() caller invokes get_device() on the pointer obtained from it, which is done by the majority of its callers, a use-after-free will occur. To prepare for addressing this problem, introduce a new function for getting the first "physical" device associated with the given ACPI one (the "primary physical device") that will also reference count the device in question before returning a pointer to it. Make that new function and acpi_get_first_physical_node() share the physical node list lookup code. No intentional functional impact.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS