CVE-2026-64511
Received Received - Intake

NULL Pointer Dereference in Linux Kernel ACPI NFIT

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: NFIT: core: Fix possible NULL pointer dereference After commit 9b311b7313d6 ("ACPI: NFIT: Install Notify() handler before getting NFIT table"), acpi_nfit_probe() installs an ACPI notify handler for the NFIT device before checking the presence of the NFIT table. If that table is not there, 0 is returned without allocating the acpi_desc object and setting the driver data pointer of the NFIT device. If the platform firmware triggers an NFIT_NOTIFY_UC_MEMORY_ERROR notification on the NFIT device at that point, acpi_nfit_uc_error_notify() will dereference a NULL pointer. Prevent that from occurring by adding an acpi_desc check against NULL to acpi_nfit_uc_error_notify().

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Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-08-14
AI Q&A
2026-07-25
EPSS Evaluated
2026-08-13
NVD
CVE-2026-64511
EUVD
EUVD-2026-48855

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a NULL pointer dereference vulnerability in the Linux kernel's ACPI NFIT driver. It occurs when the kernel tries to handle an ACPI notification for a memory error before verifying the presence of the required NFIT table. If the table is missing, a NULL pointer is dereferenced, potentially causing a system crash or other undefined behavior.

Detection Guidance

This vulnerability is specific to the Linux kernel's ACPI NFIT module and requires kernel-level inspection. Detection involves checking kernel logs for NULL pointer dereference errors related to ACPI NFIT or NFIT_NOTIFY_UC_MEMORY_ERROR notifications. Use commands like dmesg | grep -i 'acpi.*nfit' or journalctl -k | grep -i 'null pointer' to identify potential issues.

Impact Analysis

This vulnerability could lead to system instability, crashes, or unexpected behavior if the affected kernel component is triggered by platform firmware. It primarily affects systems using ACPI NFIT for memory error notifications, potentially disrupting normal operation.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a low-level kernel issue related to NULL pointer dereferencing in ACPI NFIT handling. Compliance impacts would only occur if the vulnerability led to system instability or data corruption, which is not described in the provided context.

Mitigation Strategies

Update your Linux kernel to a version that includes the fix for this vulnerability. Check your distribution's security advisories or kernel updates to apply the patch. If immediate patching is not possible, consider disabling the ACPI NFIT module if not required, but this may impact system functionality.

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