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CVE-2026-43122

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
06/05/2026
Last modified:
12/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ACPI: processor: Update cpuidle driver check in __acpi_processor_start()<br /> <br /> Commit 7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle<br /> driver registration") moved the ACPI idle driver registration to<br /> acpi_processor_driver_init() and acpi_processor_power_init() does<br /> not register an idle driver any more.<br /> <br /> Accordingly, the cpuidle driver check in __acpi_processor_start() needs<br /> to be updated to avoid calling acpi_processor_power_init() without a<br /> cpuidle driver, in which case the registration of the cpuidle device<br /> in that function would lead to a NULL pointer dereference in<br /> __cpuidle_register_device().

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.18 (including) 6.18.14 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 6.19.4 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools