CVE-2026-64183

kernel: efi: Allocate runtime workqueue before ACPI init

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's EFI (Extensible Firmware Interface) runtime services. This vulnerability occurs due to a NULL pointer dereference when ACPI (Advanced Configuration and Power Interface) PRM (Platform Runtime Mechanism) calls are made before the necessary workqueue is allocated. This can lead to system instability or crashes, resulting in a denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference