---
id: CVE-2026-80723
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  of: reserved_mem: prevent OOB when too many dynamic regions are defined

  On boot, fdt_scan_reserved_mem() saves each dynamically-placed
  /reserved-memory subnode into a …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  of: reserved_mem: prevent OOB when too many dynamic regions are defined

  On boot, fdt_scan_reserved_mem() saves each dynamically-placed
  /reserved-memory subnode into a …
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-08-28'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:18:08.920'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80723'
references:
  - url: 'https://git.kernel.org/stable/c/68d27250c9e81ab7764603e346c2b1017cb53adf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cfa7e2734877330d6c10e0f33953905486c4530c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/db3dbdfea1b8f38774419c5c2c14e4b81c48708d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/de8ccbd6bf4efe7a059e2c483789936009e10f42'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80723.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80723'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2525407'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80723'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80723'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026082811-CVE-2026-80723-2526@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00132
epssPercentile: 0.02777
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:21:00.622788Z'
scores:
  nvd: 8.4
  vendor: 5.5
  cna: 8.4
ingestedAt: '2026-10-16T19:46:24.302Z'
---

## Overview

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

of: reserved_mem: prevent OOB when too many dynamic regions are defined

On boot, fdt_scan_reserved_mem() saves each dynamically-placed
/reserved-memory subnode into a local array of size
MAX_RESERVED_REGIONS.

If the device tree defines more than MAX_RESERVED_REGIONS
dynamically-placed regions, fdt_scan_reserved_mem() writes past the
end of the local array.

Add a bounds check that logs an error and skips the excess regions,
restoring the original behavior.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80723.json)