CVE-2022-49436

{
  "id": "CVE-2022-49436",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-02-26T07:01:20.057",
  "lastModified": "2026-11-05T20:17:06.233",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/papr_scm: Fix leaking nvdimm_events_map elements\n\nRight now 'char *' elements allocated for individual 'stat_id' in\n'papr_scm_priv.nvdimm_events_map[]' during papr_scm_pmu_check_events(), get\nleaked in papr_scm_remove() and papr_scm_pmu_register(),\npapr_scm_pmu_check_events() error paths.\n\nAlso individual 'stat_id' arent NULL terminated 'char *' instead they are fixed\n8-byte sized identifiers. However papr_scm_pmu_register() assumes it to be a\nNULL terminated 'char *' and at other places it assumes it to be a\n'papr_scm_perf_stat.stat_id' sized string which is 8-byes in size.\n\nFix this by allocating the memory for papr_scm_priv.nvdimm_events_map to also\ninclude space for 'stat_id' entries. This is possible since number of available\nevents/stat_ids are known upfront. This saves some memory and one extra level of\nindirection from 'nvdimm_events_map' to 'stat_id'. Also rest of the code\ncan continue to call 'kfree(papr_scm_priv.nvdimm_events_map)' without needing to\niterate over the array and free up individual elements."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/papr_scm: Se soluciona la fuga de elementos nvdimm_events_map En este momento, los elementos 'char *' asignados para el individuo 'stat_id' en 'papr_scm_priv.nvdimm_events_map[]' durante papr_scm_pmu_check_events(), se filtran en las rutas de error papr_scm_remove() y papr_scm_pmu_register(), papr_scm_pmu_check_events(). Además, los 'stat_id' individuales no son 'char *' terminados en NULL, sino que son identificadores fijos de tamaño de 8 bytes. Sin embargo, papr_scm_pmu_register() asume que es un 'char *' terminado en NULL y en otros lugares asume que es una cadena de tamaño 'papr_scm_perf_stat.stat_id' que tiene un tamaño de 8 bytes. Solucione este problema asignando la memoria para papr_scm_priv.nvdimm_events_map para que también incluya espacio para las entradas 'stat_id'. Esto es posible ya que la cantidad de eventos/stat_id disponibles se conoce de antemano. Esto ahorra algo de memoria y un nivel adicional de indirección de 'nvdimm_events_map' a 'stat_id'. Además, el resto del código puede continuar llamando a 'kfree(papr_scm_priv.nvdimm_events_map)' sin necesidad de iterar sobre la matriz y liberar elementos individuales."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "arch/powerpc/platforms/pseries/papr_scm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4c08d4bbc089a95f3f38389c2b79dbc6ab24f10b",
              "lessThan": "b073096df4dec70d0436321b7093bad27ae91f9e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4c08d4bbc089a95f3f38389c2b79dbc6ab24f10b",
              "lessThan": "0e0946e22f3665d27325d389ff45ade6e93f3678",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "arch/powerpc/platforms/pseries/papr_scm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.18",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.18.3",
              "lessThanOrEqual": "5.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.19",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-05T19:45:34.397056Z",
          "id": "CVE-2022-49436",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.18",
              "versionEndExcluding": "5.18.3",
              "matchCriteriaId": "8E122216-2E9E-4B3E-B7B8-D575A45BA3C2"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0e0946e22f3665d27325d389ff45ade6e93f3678",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/b073096df4dec70d0436321b7093bad27ae91f9e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    }
  ]
}