---
id: CVE-2026-89963
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  powerpc/kexec_file: Fix null-ptr-def in extra size calculation

  A static Sashiko AI review identified a potential NULL pointer
  dereference in kexec_extra_fdt_size_ppc64…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  powerpc/kexec_file: Fix null-ptr-def in extra size calculation

  A static Sashiko AI review identified a potential NULL pointer
  dereference in kexec_extra_fdt_size_ppc64…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0d3ff067331ef84e7e7f49537d768881042ed5ba <
    11ef1c2a5dbe0bd8c1345f59bab7331d352f02cf
  - >-
    Linux >= 0d3ff067331ef84e7e7f49537d768881042ed5ba <
    df45337587db21c502fe5251d3bcc7887428f4fb
  - >-
    Linux >= 0d3ff067331ef84e7e7f49537d768881042ed5ba <
    4ff3d9fd71c7bc2fc81afdac1970d9c55a5c0dea
  - >-
    Linux >= 0d3ff067331ef84e7e7f49537d768881042ed5ba <
    761eda315a6e1fda3e8e2185b28430771fb1ac29
  - Linux 6.11
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:17:06.807'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89963'
references:
  - url: 'https://git.kernel.org/stable/c/11ef1c2a5dbe0bd8c1345f59bab7331d352f02cf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4ff3d9fd71c7bc2fc81afdac1970d9c55a5c0dea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/761eda315a6e1fda3e8e2185b28430771fb1ac29'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/df45337587db21c502fe5251d3bcc7887428f4fb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.960Z'
epss: 0.002
epssPercentile: 0.10122
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

powerpc/kexec_file: Fix null-ptr-def in extra size calculation

A static Sashiko AI review identified a potential NULL pointer
dereference in kexec_extra_fdt_size_ppc64().

On platforms without any reserved memory regions,
get_reserved_memory_ranges() can return 0 while leaving 'rmem'
unallocated as NULL. Passing it directly leads to a kernel panic when
evaluating 'rmem->nr_ranges'.

Add a NULL check for 'rmem' to prevent this crash.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.