CVE-2026-93227

Description

In the Linux kernel, the following vulnerability has been resolved: mm/mm_init: deferred_grow_zone(): fix out-of-range first_deferred_pfn With CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled, deferred_grow_zone() initializes struct pages early in boot to satisfy an allocation. With a large CMA reservation in place, the ranges deferred_init_memmap() finds may not add up to the allocation it was asked for, and the function ends up initializing the memory map of the entire zone and still falls short. That is fine in itself: the function accounts for it and leaves the caller to decide whether it now has enough memory. However, the update of pgdat->first_deferred_pfn that tracks where uninitialized memory map starts could overflow. If the node's RAM end is not aligned on PAGES_PER_SECTION boundaries and some deferred struct pages were initialized, pgdat->first_deferred_pfn would point past the end of the node's memory. deferred_init_memmap() later picks up from pgdat->first_deferred_pfn and hits a BUG_ON(), because it expects a pfn within its node. For example, when running a kernel with CONFIG_DEFERRED_STRUCT_PAGE_INIT=y and CONFIG_CMA=y using the following qemu command line qemu-system-x86_64 -enable-kvm -m 8032M -kernel bzImage \ -append "nokaslr cma=4768M@0x100000000" the kernel panics: kernel BUG at mm/mm_init.c:2131! CPU: 3 UID: 0 PID: 36 Comm: pgdatinit0 Not tainted 7.2.0-rc6 #1 RIP: 0010:deferred_init_memmap+0x1b8/0x1c0 RAX: 0000000000236000 R13: 0000000000238000 Call Trace: kthread+0xdf/0x120 ret_from_fork+0x187/0x250 Make sure that the update of pgdta->first_deferred_pfn does not overflow when the entire zone's (and therefore node's) memory map is initialized. [rppt: massaged the changelog]

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: —
CVSS score: —
CVSS vector: —
Effective score: no score available from CNA, NVD, or AI yet
CWE(s): —
Reserved: 2026-09-17
Published: 2026-09-24 15:29 UTC
Last updated: 2026-09-24 15:29 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/93xxx/CVE-2026-93227.json

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European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-86232
Assigner: Linux
Published: Sep 24, 2026, 3:29:00 PM
Updated: Sep 24, 2026, 3:29:00 PM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.0000
Vendors: Linux
Products: Linux (3acb913c9d5bd8dcf61677ccba96d349e7681cf8 <45489d4f95802903ab35799b400b346fa4e13151)

Linux (patch: 7.2.4)

Linux (patch: 6.18.50)

Linux (patch: 7.3-rc1)

Linux (patch: 0)

Linux (6.18)

Linux (3acb913c9d5bd8dcf61677ccba96d349e7681cf8 <84339578c2d6936ac3a93cd1f0bbaa3468a988f2)

Linux (3acb913c9d5bd8dcf61677ccba96d349e7681cf8 <97090500d776c3f6d08e857e3a0a7cf092999094)
Aliases: GHSA-x6mv-65qg-c346

ENISA description: In the Linux kernel, the following vulnerability has been resolved: mm/mm_init: deferred_grow_zone(): fix out-of-range first_deferred_pfn With CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled, deferred_grow_zone() initializes struct pages early in boot to satisfy an allocation. With a large CMA reservation in place, the ranges deferred_init_memmap() finds may not add up to the allocation it was asked for, and the function ends up initializing the memory map of the entire zone and still falls short. That is fine in itself: the function accounts for it and leaves the caller to decide whether it now has enough memory. However, the update of pgdat->first_deferred_pfn that tracks where uninitialized memory map starts could overflow. If the node's RAM end is not aligned on PAGES_PER_SECTION boundaries and some deferred struct pages were initialized, pgdat->first_deferred_pfn would point past the end of the node's memory. deferred_init_memmap() later picks up from pgdat->first_deferred_pfn and hits a BUG_ON(), because it expects a pfn within its node. For example, when running a kernel with CONFIG_DEFERRED_STRUCT_PAGE_INIT=y and CONFIG_CMA=y using the following qemu command line qemu-system-x86_64 -enable-kvm -m 8032M -kernel bzImage \ -append "nokaslr cma=4768M@0x100000000" the kernel panics: kernel BUG at mm/mm_init.c:2131! CPU: 3 UID: 0 PID: 36 Comm: pgdatinit0 Not tainted 7.2.0-rc6 #1 RIP: 0010:deferred_init_memmap+0x1b8/0x1c0 RAX: 0000000000236000 R13: 0000000000238000 Call Trace: kthread+0xdf/0x120 ret_from_fork+0x187/0x250 Make sure that the update of pgdta->first_deferred_pfn does not overflow when the entire zone's (and therefore node's) memory map is initialized. [rppt: massaged the changelog]

EUVD references (3)

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`3acb913c9d5bd8dcf61677ccba96d349e7681cf8` (affected), `3acb913c9d5bd8dcf61677ccba96d349e7681cf8` (affected), `3acb913c9d5bd8dcf61677ccba96d349e7681cf8` (affected)	—
Linux	Linux	`6.18` (affected), `0` (unaffected), `6.18.50` (unaffected), `7.2.4` (unaffected), `7.3-rc1` (unaffected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

Remediations (10)

July 2026 Critical Patch Update Released | security - Oracle Blogs

web:blogs.oracle.com

For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-09-25 10:45 UTC
Adobe Security Bulletins and Advisories | Security

web:helpx.adobe.com

This page contains important information regarding security vulnerabilities that could affect specific versions of Adobe products. Use this information to take the prescribed corrective actions.

2026-09-25 10:45 UTC
August 2026 cumulative update - .NET Framework | Microsoft Learn

web:learn.microsoft.com

Unlike traditional cumulative updates that patch individual components, this update delivers the full .NET Framework 3.5 product as a standalone installer. It replaces any previously installed version.

2026-09-25 10:45 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-25 10:45 UTC
K000163100: Linux kernel vulnerability CVE-2026-53227

web:my.f5.com

If the Fixes introduced in column lists a version prior to the one you are running, in the same branch, then your version should have the fix . Mitigation To mitigate this vulnerability, you should permit management access to the F5OS system only over a secure network and restrict access to only trusted users.

2026-09-25 10:45 UTC
Cisco Security Advisory: Cisco Nexus Dashboard Software Security ...

web:sec.cloudapps.cisco.com

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Nexus Dashboard engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. These vulnerabilities were found during internal testing and are not known to be actively exploited. To ...

2026-09-25 10:45 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-25 10:45 UTC
CVE-2026-93227 - Linux Kernel Deferred Initialization…

web:vulmon.com

Linux Kernel Deferred Initialization Vulnerability Leads to Memory Map Overflow. A vulnerability in the Linux kernel's deferred initialization process can cause…

2026-09-25 10:45 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-25 10:45 UTC
Oracle Critical Security Patch Update Advisory - June 2026

web:www.oracle.com

Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...

2026-09-25 10:45 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-93227.json.

{
  "containers": {
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          "defaultStatus": "unaffected",
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          "programFiles": [
            "mm/mm_init.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            },
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            },
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            },
            {
              "lessThanOrEqual": "*",
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              "versionType": "original_commit_for_fix"
            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mm_init: deferred_grow_zone(): fix out-of-range first_deferred_pfn\n\nWith CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled, deferred_grow_zone()\ninitializes struct pages early in boot to satisfy an allocation.\n\nWith a large CMA reservation in place, the ranges deferred_init_memmap()\nfinds may not add up to the allocation it was asked for, and the function\nends up initializing the memory map of the entire zone and still falls\nshort.\n\nThat is fine in itself: the function accounts for it and leaves the\ncaller to decide whether it now has enough memory.\n\nHowever, the update of pgdat->first_deferred_pfn that tracks where\nuninitialized memory map starts could overflow.\n\nIf the node's RAM end is not aligned on PAGES_PER_SECTION boundaries and\nsome deferred struct pages were initialized, pgdat->first_deferred_pfn\nwould point past the end of the node's memory.\n\ndeferred_init_memmap() later picks up from pgdat->first_deferred_pfn and\nhits a BUG_ON(), because it expects a pfn within its node.\n\nFor example, when running a kernel with CONFIG_DEFERRED_STRUCT_PAGE_INIT=y\nand CONFIG_CMA=y using the following qemu command line\n\n  qemu-system-x86_64 -enable-kvm -m 8032M -kernel bzImage \\\n      -append \"nokaslr cma=4768M@0x100000000\"\n\nthe kernel panics:\n\n  kernel BUG at mm/mm_init.c:2131!\n  CPU: 3 UID: 0 PID: 36 Comm: pgdatinit0 Not tainted 7.2.0-rc6 #1\n  RIP: 0010:deferred_init_memmap+0x1b8/0x1c0\n  RAX: 0000000000236000 R13: 0000000000238000\n  Call Trace:\n   kthread+0xdf/0x120\n   ret_from_fork+0x187/0x250\n\nMake sure that the update of pgdta->first_deferred_pfn does not overflow\nwhen the entire zone's (and therefore node's) memory map is initialized.\n\n[rppt: massaged the changelog]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T15:29:00.289Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/84339578c2d6936ac3a93cd1f0bbaa3468a988f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/97090500d776c3f6d08e857e3a0a7cf092999094"
        }
      ],
      "title": "mm/mm_init: deferred_grow_zone(): fix out-of-range first_deferred_pfn",
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    "cveId": "CVE-2026-93227",
    "datePublished": "2026-09-24T15:29:00.289Z",
    "dateReserved": "2026-09-17T16:02:15.094Z",
    "dateUpdated": "2026-09-24T15:29:00.289Z",
    "state": "PUBLISHED"
  },
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}