mm/vmalloc: fix data race in show_numa_info()

{
  "id": "5144f898c6a2de7d9655cd6157aa68b633293b158d4264749a493323559e5108",
  "url": "https://osv.dev/vulnerability/CVE-2025-38383",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/vmalloc: fix data race in show_numa_info()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: fix data race in show_numa_info() The following data-race was found in show_numa_info(): ================================================================== BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show read to 0xffff88800971fe30 of 4 bytes by task 8289 on cpu 0: show_numa_info mm/vmalloc.c:4936 [inline] vmalloc_info_show+0x5a8/0x7e0 mm/vmalloc.c:5016 seq_read_iter+0x373/0xb40 fs/seq_file.c:230 proc_reg_read_iter+0x11e/0x170 fs/proc/inode.c:299 .... write to 0xffff88800971fe30 of 4 bytes by task 8287 on cpu 1: show_numa_info mm/vmalloc.c:4934 [inline] vmalloc_info_show+0x38f/0x7e0 mm/vmalloc.c:5016 seq_read_iter+0x373/0xb40 fs/seq_file.c:230 proc_reg_read_iter+0x11e/0x170 fs/proc/inode.c:299 .... value changed: 0x0000008f -> 0x00000000 ================================================================== According to this report,there is a read/write data-race because m->private is accessible to multiple CPUs. To fix this, instead of allocating the heap in proc_vmalloc_init() and passing the heap address to m->private, vmalloc_info_show() should allocate the heap.",
    "evidence": "osv:CVE-2025-38383",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.37",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38383",
      "aliases": [
        "CVE-2025-38383"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8e1d743f2c2671aa54f6f91a2b33823f92512870"
                },
                {
                  "fixed": "ead91de35d9cd5c4f80ec51e6020f342079170af"
                },
                {
                  "fixed": "5c966f447a584ece3c70395898231aeb56256ee7"
                },
                {
                  "fixed": "5c5f0468d172ddec2e333d738d2a1f85402cf0bc"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38383.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.12.37"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38383.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.066318280Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5c5f0468d172ddec2e333d738d2a1f85402cf0bc",
        "https://git.kernel.org/stable/c/5c966f447a584ece3c70395898231aeb56256ee7",
        "https://git.kernel.org/stable/c/ead91de35d9cd5c4f80ec51e6020f342079170af",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38383.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38383",
        "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/2025/38xxx/CVE-2025-38383.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38383",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 509777,
  "published_at": "2025-07-25T12:53:24.578+00:00"
}