CVE-2022-50043 (GCVE-0-2022-50043)
Vulnerability from cvelistv5
Published
2025-06-18 11:01
Modified
2025-06-18 11:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix potential refcount leak in ndisc_router_discovery() The issue happens on specific paths in the function. After both the object `rt` and `neigh` are grabbed successfully, when `lifetime` is nonzero but the metric needs change, the function just deletes the route and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh` again if above conditions hold. The function simply overwrite `neigh` if succeeds or returns if fails, without decreasing the reference count of previous `neigh`. This may result in memory leaks. Fix it by decrementing the reference count of `neigh` in place.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6b2e04bc240fe9be9e690059f710e9f95346d34d
Version: 6b2e04bc240fe9be9e690059f710e9f95346d34d
Version: 6b2e04bc240fe9be9e690059f710e9f95346d34d
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ndisc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ffb15594433391fd7885eb88ce5a7f7bdeefbb15",
              "status": "affected",
              "version": "6b2e04bc240fe9be9e690059f710e9f95346d34d",
              "versionType": "git"
            },
            {
              "lessThan": "7998043d31d000c3a93f46182e6569dd0eecda34",
              "status": "affected",
              "version": "6b2e04bc240fe9be9e690059f710e9f95346d34d",
              "versionType": "git"
            },
            {
              "lessThan": "7396ba87f1edf549284869451665c7c4e74ecd4f",
              "status": "affected",
              "version": "6b2e04bc240fe9be9e690059f710e9f95346d34d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ndisc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.63",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.63",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.4",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix potential refcount leak in ndisc_router_discovery()\n\nThe issue happens on specific paths in the function. After both the\nobject `rt` and `neigh` are grabbed successfully, when `lifetime` is\nnonzero but the metric needs change, the function just deletes the\nroute and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh`\nagain if above conditions hold. The function simply overwrite `neigh`\nif succeeds or returns if fails, without decreasing the reference\ncount of previous `neigh`. This may result in memory leaks.\n\nFix it by decrementing the reference count of `neigh` in place."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:01:44.186Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ffb15594433391fd7885eb88ce5a7f7bdeefbb15"
        },
        {
          "url": "https://git.kernel.org/stable/c/7998043d31d000c3a93f46182e6569dd0eecda34"
        },
        {
          "url": "https://git.kernel.org/stable/c/7396ba87f1edf549284869451665c7c4e74ecd4f"
        }
      ],
      "title": "net: fix potential refcount leak in ndisc_router_discovery()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50043",
    "datePublished": "2025-06-18T11:01:44.186Z",
    "dateReserved": "2025-06-18T10:57:27.399Z",
    "dateUpdated": "2025-06-18T11:01:44.186Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50043\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:32.787\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: fix potential refcount leak in ndisc_router_discovery()\\n\\nThe issue happens on specific paths in the function. After both the\\nobject `rt` and `neigh` are grabbed successfully, when `lifetime` is\\nnonzero but the metric needs change, the function just deletes the\\nroute and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh`\\nagain if above conditions hold. The function simply overwrite `neigh`\\nif succeeds or returns if fails, without decreasing the reference\\ncount of previous `neigh`. This may result in memory leaks.\\n\\nFix it by decrementing the reference count of `neigh` in place.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: correcci\u00f3n de una posible fuga de referencias en ndisc_router_discovery(). El problema se produce en rutas espec\u00edficas de la funci\u00f3n. Tras la captura correcta de los objetos `rt` y `neigh`, cuando `lifetime` es distinto de cero pero la m\u00e9trica necesita cambiar, la funci\u00f3n simplemente elimina la ruta y establece `rt` en NULL. A continuaci\u00f3n, puede intentar capturar `rt` y `neigh` de nuevo si se cumplen las condiciones anteriores. La funci\u00f3n simplemente sobrescribe `neigh` si tiene \u00e9xito o retorna si falla, sin reducir la cantidad de referencias de `neigh` anterior. Esto puede provocar fugas de memoria. Para solucionarlo, reduzca la cantidad de referencias de `neigh` en su lugar.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7396ba87f1edf549284869451665c7c4e74ecd4f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7998043d31d000c3a93f46182e6569dd0eecda34\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ffb15594433391fd7885eb88ce5a7f7bdeefbb15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.