CVE-2022-49080 (GCVE-0-2022-49080)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2025-05-04 08:29
VLAI?
Title
mm/mempolicy: fix mpol_new leak in shared_policy_replace
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); }
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < 8510c2346d9e47a72b7f018a36ef0c39483e53d6 (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < 5e16dc5378abd749a836daa9ee4ab2c8d2668999 (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < 39a32f3c06f6d68a530bf9612afa19f50f12e93d (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < 25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < f7e183b0a7136b6dc9c7b9b2a85a608a8feba894 (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < 198932a14aeb19a15cf19e51e151d023bc4cd648 (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < 6e00309ac716fa8225f0cbde2cd9c24f0e74ee21 (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < fe39ac59dbbf893b73b24e3184161d0bd06d6651 (git)
Affected: 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 , < 4ad099559b00ac01c3726e5c95dc3108ef47d03e (git)
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    Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 4.9.311 , ≤ 4.9.* (semver)
Unaffected: 4.14.276 , ≤ 4.14.* (semver)
Unaffected: 4.19.238 , ≤ 4.19.* (semver)
Unaffected: 5.4.189 , ≤ 5.4.* (semver)
Unaffected: 5.10.111 , ≤ 5.10.* (semver)
Unaffected: 5.15.34 , ≤ 5.15.* (semver)
Unaffected: 5.16.20 , ≤ 5.16.* (semver)
Unaffected: 5.17.3 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/mempolicy.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "3.8"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.311",
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            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.276",
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            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.238",
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            },
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.189",
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              "status": "unaffected",
              "version": "5.15.34",
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              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.20",
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            },
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              "version": "5.17.3",
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            },
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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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"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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