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
https://git.kernel.org/stable/c/8510c2346d9e47a72b7f018a36ef0c39483e53d6
https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999
https://git.kernel.org/stable/c/39a32f3c06f6d68a530bf9612afa19f50f12e93d
https://git.kernel.org/stable/c/25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b
https://git.kernel.org/stable/c/f7e183b0a7136b6dc9c7b9b2a85a608a8feba894
https://git.kernel.org/stable/c/198932a14aeb19a15cf19e51e151d023bc4cd648
https://git.kernel.org/stable/c/6e00309ac716fa8225f0cbde2cd9c24f0e74ee21
https://git.kernel.org/stable/c/fe39ac59dbbf893b73b24e3184161d0bd06d6651
https://git.kernel.org/stable/c/4ad099559b00ac01c3726e5c95dc3108ef47d03e
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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   Linux Linux Version: 3.8
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{
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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"
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          "url": "https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999"
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        {
          "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"
}


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