mm/hugetlb: do not call vma_add_reservation upon ENOMEM

{
  "id": "6b5aa6f0e8aa9ede9da147f93d68f8b641a53df76971841addd04480fab783a2",
  "url": "https://osv.dev/vulnerability/CVE-2024-39477",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/hugetlb: do not call vma_add_reservation upon ENOMEM",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: do not call vma_add_reservation upon ENOMEM sysbot reported a splat [1] on __unmap_hugepage_range(). This is because vma_needs_reservation() can return -ENOMEM if allocate_file_region_entries() fails to allocate the file_region struct for the reservation. Check for that and do not call vma_add_reservation() if that is the case, otherwise region_abort() and region_del() will see that we do not have any file_regions. If we detect that vma_needs_reservation() returned -ENOMEM, we clear the hugetlb_restore_reserve flag as if this reservation was still consumed, so free_huge_folio() will not increment the resv count. [1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa",
    "evidence": "osv:CVE-2024-39477",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.9.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-39477",
      "aliases": [
        "CVE-2024-39477"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "df7a6d1f64056aec572162c5d35ed9ff86ece6f3"
                },
                {
                  "fixed": "aa998f9dcb34c28448f86e8f5490f20d5eb0eac7"
                },
                {
                  "fixed": "8daf9c702ee7f825f0de8600abff764acfedea13"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-39477.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.9.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-39477.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.252307764Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13",
        "https://git.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/39xxx/CVE-2024-39477.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-39477",
        "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/2024/39xxx/CVE-2024-39477.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-39477",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488449,
  "published_at": "2024-07-05T06:55:07.268+00:00"
}