{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T04:26:15.943Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-39477",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T17:07:38.781989Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:39.612Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/hugetlb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aa998f9dcb34c28448f86e8f5490f20d5eb0eac7",
              "status": "affected",
              "version": "df7a6d1f64056aec572162c5d35ed9ff86ece6f3",
              "versionType": "git"
            },
            {
              "lessThan": "8daf9c702ee7f825f0de8600abff764acfedea13",
              "status": "affected",
              "version": "df7a6d1f64056aec572162c5d35ed9ff86ece6f3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/hugetlb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.9.*",
              "status": "unaffected",
              "version": "6.9.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9.5",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: do not call vma_add_reservation upon ENOMEM\n\nsysbot reported a splat [1] on __unmap_hugepage_range().  This is because\nvma_needs_reservation() can return -ENOMEM if\nallocate_file_region_entries() fails to allocate the file_region struct\nfor the reservation.\n\nCheck for that and do not call vma_add_reservation() if that is the case,\notherwise region_abort() and region_del() will see that we do not have any\nfile_regions.\n\nIf we detect that vma_needs_reservation() returned -ENOMEM, we clear the\nhugetlb_restore_reserve flag as if this reservation was still consumed, so\nfree_huge_folio() will not increment the resv count.\n\n[1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached only through local syscalls on the attacker\u0027s own address space \u2014 mmap(MAP_HUGETLB), madvise(MADV_DONTNEED), munmap, or process exit driving __unmap_hugepage_range(). There is no network- or adjacent-reachable trigger.\nAC:L - Every element of the trigger is attacker-controlled and deterministic \u2014 the private anonymous hugetlb VMA, the merged reservation region, the drained region_cache, and the middle-page unmap that forces region_del()\u0027s split path; only the file_region kmalloc failure must be induced, which an attacker does by driving memory exhaustion (hugetlb hosts are already memory-tight, and a task that becomes an OOM victim has its GFP_KERNEL allocations fail while exit_mmap runs this exact code). Once the single ENOMEM lands, adds_in_progress stays at -1 permanently and the corruption repeats on ordinary faults without further allocation failures, so the attempt can be retried indefinitely.\nPR:L - A plain unprivileged local user suffices: hugetlb_file_setup() gates only SHM_HUGETLB on CAP_IPC_LOCK, so anonymous MAP_PRIVATE|MAP_HUGETLB mmap and MADV_DONTNEED on the resulting VMA require no capability. A non-zero hugepage pool is an administrator-side configuration, standard on database, KVM, DPDK and HPC hosts, not a privilege held by the attacker.\nUI:N - The attacker\u0027s own process performs the entire sequence \u2014 mmap, fault-in, madvise/munmap \u2014 with no action by any other user or victim process.\nS:U - The corruption is confined to kernel heap objects (struct resv_map and the slab freelist) within the same security authority; no VM, hypervisor, or IOMMU boundary is crossed.\nC:H - region_del() and get_file_region_entry_from_cache() fabricate a file_region pointing at the resv_map itself and then kfree() that interior pointer while the object is still live, producing overlapping slab objects and a freelist containing a misaligned pointer \u2014 a well-known route to reading adjacent kernel heap contents. The corrupted rw_semaphore also breaks the serialization of hugetlb page-table walks against unmapping, widening the disclosure surface.\nI:H - The bogus file_region overlays struct resv_map, so nrg-\u003efrom/nrg-\u003eto and copy_hugetlb_cgroup_uncharge_info() perform out-of-bounds writes over region_cache_count and the rw_semaphore (count, owner, wait_lock) that guards private hugetlb page tables, and kfree() of an interior pointer corrupts the SLUB freelist \u2014 a controllable heap-grooming primitive toward arbitrary write and control-flow hijack. The reservation accounting is also permanently falsified, letting one process steal huge pages reserved by another.\nA:H - On CONFIG_DEBUG_VM kernels this is an immediate panic via VM_BUG_ON(!resv-\u003eregion_cache_count) in region_abort() and VM_BUG_ON(adds_in_progress) in resv_map_release() \u2014 precisely the syzbot splat. Without DEBUG_VM the list poisoning, wrecked rw_semaphore (hangs/deadlock in hugetlb faults), slab corruption, and permanently inflated h-\u003eresv_huge_pages produce oopses and SIGBUS-level denial of hugepages for every user on the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:33:30.787Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7"
        },
        {
          "url": "https://git.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13"
        }
      ],
      "title": "mm/hugetlb: do not call vma_add_reservation upon ENOMEM",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-39477",
    "datePublished": "2024-07-05T06:55:07.268Z",
    "dateReserved": "2024-06-25T14:23:23.746Z",
    "dateUpdated": "2026-08-05T11:33:30.787Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}