CVE-2022-50630 (GCVE-0-2022-50630)
Vulnerability from cvelistv5
Published
2025-12-08 01:16
Modified
2025-12-08 01:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: hugetlb: fix UAF in hugetlb_handle_userfault The vma_lock and hugetlb_fault_mutex are dropped before handling userfault and reacquire them again after handle_userfault(), but reacquire the vma_lock could lead to UAF[1,2] due to the following race, hugetlb_fault hugetlb_no_page /*unlock vma_lock */ hugetlb_handle_userfault handle_userfault /* unlock mm->mmap_lock*/ vm_mmap_pgoff do_mmap mmap_region munmap_vma_range /* clean old vma */ /* lock vma_lock again <--- UAF */ /* unlock vma_lock */ Since the vma_lock will unlock immediately after hugetlb_handle_userfault(), let's drop the unneeded lock and unlock in hugetlb_handle_userfault() to fix the issue. [1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/ [2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/
References
Impacted products
Vendor Product Version
Linux Linux Version: 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45
Version: 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45
Version: 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45
Version: 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45
Version: 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/hugetlb.c"
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              "version": "0",
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              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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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: hugetlb: fix UAF in hugetlb_handle_userfault\n\nThe vma_lock and hugetlb_fault_mutex are dropped before handling userfault\nand reacquire them again after handle_userfault(), but reacquire the\nvma_lock could lead to UAF[1,2] due to the following race,\n\nhugetlb_fault\n  hugetlb_no_page\n    /*unlock vma_lock */\n    hugetlb_handle_userfault\n      handle_userfault\n        /* unlock mm-\u003emmap_lock*/\n                                           vm_mmap_pgoff\n                                             do_mmap\n                                               mmap_region\n                                                 munmap_vma_range\n                                                   /* clean old vma */\n        /* lock vma_lock again  \u003c--- UAF */\n    /* unlock vma_lock */\n\nSince the vma_lock will unlock immediately after\nhugetlb_handle_userfault(), let\u0027s drop the unneeded lock and unlock in\nhugetlb_handle_userfault() to fix the issue.\n\n[1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/\n[2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-08T01:16:45.555Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29"
        },
        {
          "url": "https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a"
        },
        {
          "url": "https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33"
        },
        {
          "url": "https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc"
        }
      ],
      "title": "mm: hugetlb: fix UAF in hugetlb_handle_userfault",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50630",
    "datePublished": "2025-12-08T01:16:45.555Z",
    "dateReserved": "2025-12-08T01:14:55.192Z",
    "dateUpdated": "2025-12-08T01:16:45.555Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50630\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-08T02:15:49.223\",\"lastModified\":\"2025-12-08T18:26:19.900\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm: hugetlb: fix UAF in hugetlb_handle_userfault\\n\\nThe vma_lock and hugetlb_fault_mutex are dropped before handling userfault\\nand reacquire them again after handle_userfault(), but reacquire the\\nvma_lock could lead to UAF[1,2] due to the following race,\\n\\nhugetlb_fault\\n  hugetlb_no_page\\n    /*unlock vma_lock */\\n    hugetlb_handle_userfault\\n      handle_userfault\\n        /* unlock mm-\u003emmap_lock*/\\n                                           vm_mmap_pgoff\\n                                             do_mmap\\n                                               mmap_region\\n                                                 munmap_vma_range\\n                                                   /* clean old vma */\\n        /* lock vma_lock again  \u003c--- UAF */\\n    /* unlock vma_lock */\\n\\nSince the vma_lock will unlock immediately after\\nhugetlb_handle_userfault(), let\u0027s drop the unneeded lock and unlock in\\nhugetlb_handle_userfault() to fix the issue.\\n\\n[1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/\\n[2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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