CVE-2022-49080 (GCVE-0-2022-49080)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2025-05-04 08:29
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix mpol_new leak in shared_policy_replace If mpol_new is allocated but not used in restart loop, mpol_new will be freed via mpol_put before returning to the caller. But refcnt is not initialized yet, so mpol_put could not do the right things and might leak the unused mpol_new. This would happen if mempolicy was updated on the shared shmem file while the sp->lock has been dropped during the memory allocation. This issue could be triggered easily with the below code snippet if there are many processes doing the below work at the same time: shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT); shm = shmat(shmid, 0, 0); loop many times { mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0); mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask, maxnode, 0); }
References
Impacted products
Vendor Product Version
Linux Linux Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
Version: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/mempolicy.c"
          ],
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "3.8"
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              "version": "0",
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            },
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              "version": "5.18",
              "versionType": "original_commit_for_fix"
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      ],
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: fix mpol_new leak in shared_policy_replace\n\nIf mpol_new is allocated but not used in restart loop, mpol_new will be\nfreed via mpol_put before returning to the caller.  But refcnt is not\ninitialized yet, so mpol_put could not do the right things and might\nleak the unused mpol_new.  This would happen if mempolicy was updated on\nthe shared shmem file while the sp-\u003elock has been dropped during the\nmemory allocation.\n\nThis issue could be triggered easily with the below code snippet if\nthere are many processes doing the below work at the same time:\n\n  shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT);\n  shm = shmat(shmid, 0, 0);\n  loop many times {\n    mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0);\n    mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask,\n          maxnode, 0);\n  }"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:29:17.556Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8510c2346d9e47a72b7f018a36ef0c39483e53d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999"
        },
        {
          "url": "https://git.kernel.org/stable/c/39a32f3c06f6d68a530bf9612afa19f50f12e93d"
        },
        {
          "url": "https://git.kernel.org/stable/c/25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7e183b0a7136b6dc9c7b9b2a85a608a8feba894"
        },
        {
          "url": "https://git.kernel.org/stable/c/198932a14aeb19a15cf19e51e151d023bc4cd648"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e00309ac716fa8225f0cbde2cd9c24f0e74ee21"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe39ac59dbbf893b73b24e3184161d0bd06d6651"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ad099559b00ac01c3726e5c95dc3108ef47d03e"
        }
      ],
      "title": "mm/mempolicy: fix mpol_new leak in shared_policy_replace",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49080",
    "datePublished": "2025-02-26T01:54:41.176Z",
    "dateReserved": "2025-02-26T01:49:39.247Z",
    "dateUpdated": "2025-05-04T08:29:17.556Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49080\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:00:45.347\",\"lastModified\":\"2025-02-26T07:00:45.347\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/mempolicy: fix mpol_new leak in shared_policy_replace\\n\\nIf mpol_new is allocated but not used in restart loop, mpol_new will be\\nfreed via mpol_put before returning to the caller.  But refcnt is not\\ninitialized yet, so mpol_put could not do the right things and might\\nleak the unused mpol_new.  This would happen if mempolicy was updated on\\nthe shared shmem file while the sp-\u003elock has been dropped during the\\nmemory allocation.\\n\\nThis issue could be triggered easily with the below code snippet if\\nthere are many processes doing the below work at the same time:\\n\\n  shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT);\\n  shm = shmat(shmid, 0, 0);\\n  loop many times {\\n    mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0);\\n    mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask,\\n          maxnode, 0);\\n  }\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/mempolicy: arregla la fuga de mpol_new en shared_policy_replace Si mpol_new se asigna pero no se usa en el bucle de reinicio, mpol_new se liberar\u00e1 a trav\u00e9s de mpol_put antes de regresar al llamador. Pero refcnt a\u00fan no se ha inicializado, por lo que mpol_put no podr\u00eda hacer las cosas correctas y podr\u00eda filtrar el mpol_new no utilizado. Esto suceder\u00eda si mempolicy se actualizara en el archivo shmem compartido mientras se eliminaba sp-\u0026gt;lock durante la asignaci\u00f3n de memoria. Este problema se podr\u00eda activar f\u00e1cilmente con el siguiente fragmento de c\u00f3digo si hay muchos procesos haciendo el siguiente trabajo al mismo tiempo: shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT); shm = shmat(shmid, 0, 0); repetir muchas veces { mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0); mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask, maxnode, 0); }\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/198932a14aeb19a15cf19e51e151d023bc4cd648\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/39a32f3c06f6d68a530bf9612afa19f50f12e93d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4ad099559b00ac01c3726e5c95dc3108ef47d03e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e00309ac716fa8225f0cbde2cd9c24f0e74ee21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8510c2346d9e47a72b7f018a36ef0c39483e53d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7e183b0a7136b6dc9c7b9b2a85a608a8feba894\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe39ac59dbbf893b73b24e3184161d0bd06d6651\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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