of_numa: fix uninitialized memory nodes causing kernel panic

{
  "id": "e935b3c87275ead50f295edde82ff3b5a5295ccb92313f7a0a2139f5fc03eca3",
  "url": "https://osv.dev/vulnerability/CVE-2025-39903",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "of_numa: fix uninitialized memory nodes causing kernel panic",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: of_numa: fix uninitialized memory nodes causing kernel panic When there are memory-only nodes (nodes without CPUs), these nodes are not properly initialized, causing kernel panic during boot. of_numa_init of_numa_parse_cpu_nodes node_set(nid, numa_nodes_parsed); of_numa_parse_memory_nodes In of_numa_parse_cpu_nodes, numa_nodes_parsed gets updated only for nodes containing CPUs. Memory-only nodes should have been updated in of_numa_parse_memory_nodes, but they weren't. Subsequently, when free_area_init() attempts to access NODE_DATA() for these uninitialized memory nodes, the kernel panics due to NULL pointer dereference. This can be reproduced on ARM64 QEMU with 1 CPU and 2 memory nodes: qemu-system-aarch64 \\ -cpu host -nographic \\ -m 4G -smp 1 \\ -machine virt,accel=kvm,gic-version=3,iommu=smmuv3 \\ -object memory-backend-ram,size=2G,id=mem0 \\ -object memory-backend-ram,size=2G,id=mem1 \\ -numa node,nodeid=0,memdev=mem0 \\ -numa node,nodeid=1,memdev=mem1 \\ -kernel $IMAGE \\ -hda $DISK \\ -append \"console=ttyAMA0 root=/dev/vda rw earlycon\" [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x481fd010] [ 0.000000] Linux version 6.17.0-rc1-00001-gabb4b3daf18c-dirty (yintirui@local) (gcc (GCC) 12.3.1, GNU ld (GNU Binutils) 2.41) #52 SMP PREEMPT Mon Aug 18 09:49:40 CST 2025 [ 0.000000] KASLR enabled [ 0.000000] random: crng init done [ 0.000000] Machine model: linux,dummy-virt [ 0.000000] efi: UEFI not found. [ 0.",
    "evidence": "osv:CVE-2025-39903",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.46",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-39903",
      "aliases": [
        "CVE-2025-39903"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "767507654c22578ea0b51d181211b2e7714ea7cd"
                },
                {
                  "fixed": "c2daa6eb4740720b5bd0e06267d7c93a3eed844e"
                },
                {
                  "fixed": "f3286ad8eeae15fd4bd5c12f9adfe888b26baf62"
                },
                {
                  "fixed": "ee4d098cbc9160f573b5c1b5a51d6158efdb2896"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39903.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.12.0"
                },
                {
                  "fixed": "6.12.46"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.16.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39903.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.040274654Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/c2daa6eb4740720b5bd0e06267d7c93a3eed844e",
        "https://git.kernel.org/stable/c/ee4d098cbc9160f573b5c1b5a51d6158efdb2896",
        "https://git.kernel.org/stable/c/f3286ad8eeae15fd4bd5c12f9adfe888b26baf62",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39903.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39903",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39903.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39903",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495924,
  "published_at": "2025-10-01T07:42:50.215+00:00"
}