CVE-2022-50334 (GCVE-0-2022-50334)
Vulnerability from cvelistv5
Published
2025-09-15 14:49
Modified
2025-09-15 14:49
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param() Syzkaller reports a null-ptr-deref bug as follows: ====================================================== KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:hugetlbfs_parse_param+0x1dd/0x8e0 fs/hugetlbfs/inode.c:1380 [...] Call Trace: <TASK> vfs_parse_fs_param fs/fs_context.c:148 [inline] vfs_parse_fs_param+0x1f9/0x3c0 fs/fs_context.c:129 vfs_parse_fs_string+0xdb/0x170 fs/fs_context.c:191 generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:231 do_new_mount fs/namespace.c:3036 [inline] path_mount+0x12de/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] </TASK> ====================================================== According to commit "vfs: parse: deal with zero length string value", kernel will set the param->string to null pointer in vfs_parse_fs_string() if fs string has zero length. Yet the problem is that, hugetlbfs_parse_param() will dereference the param->string, without checking whether it is a null pointer. To be more specific, if hugetlbfs_parse_param() parses an illegal mount parameter, such as "size=,", kernel will constructs struct fs_parameter with null pointer in vfs_parse_fs_string(), then passes this struct fs_parameter to hugetlbfs_parse_param(), which triggers the above null-ptr-deref bug. This patch solves it by adding sanity check on param->string in hugetlbfs_parse_param().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26215b7ee923b9251f7bb12c4e5f09dc465d35f2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9a8862820cbf1f18dca4f3b4c289d88561b3a384
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dcd28191be9bbf307ba51a5b485773a55b0037c4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f2207145693ae5697a7b59e2add4b92f9e5b0e3c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa71639873518e3587632ae58e25e4a96b57fa90
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/hugetlbfs/inode.c"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "5.15.86",
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              "version": "6.0.16",
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              "version": "6.1.2",
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              "versionType": "original_commit_for_fix"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()\n\nSyzkaller reports a null-ptr-deref bug as follows:\n======================================================\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:hugetlbfs_parse_param+0x1dd/0x8e0 fs/hugetlbfs/inode.c:1380\n[...]\nCall Trace:\n \u003cTASK\u003e\n vfs_parse_fs_param fs/fs_context.c:148 [inline]\n vfs_parse_fs_param+0x1f9/0x3c0 fs/fs_context.c:129\n vfs_parse_fs_string+0xdb/0x170 fs/fs_context.c:191\n generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:231\n do_new_mount fs/namespace.c:3036 [inline]\n path_mount+0x12de/0x1e20 fs/namespace.c:3370\n do_mount fs/namespace.c:3383 [inline]\n __do_sys_mount fs/namespace.c:3591 [inline]\n __se_sys_mount fs/namespace.c:3568 [inline]\n __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n \u003c/TASK\u003e\n======================================================\n\nAccording to commit \"vfs: parse: deal with zero length string value\",\nkernel will set the param-\u003estring to null pointer in vfs_parse_fs_string()\nif fs string has zero length.\n\nYet the problem is that, hugetlbfs_parse_param() will dereference the\nparam-\u003estring, without checking whether it is a null pointer.  To be more\nspecific, if hugetlbfs_parse_param() parses an illegal mount parameter,\nsuch as \"size=,\", kernel will constructs struct fs_parameter with null\npointer in vfs_parse_fs_string(), then passes this struct fs_parameter to\nhugetlbfs_parse_param(), which triggers the above null-ptr-deref bug.\n\nThis patch solves it by adding sanity check on param-\u003estring\nin hugetlbfs_parse_param()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T14:49:48.608Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/fa71639873518e3587632ae58e25e4a96b57fa90"
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        },
        {
          "url": "https://git.kernel.org/stable/c/f2207145693ae5697a7b59e2add4b92f9e5b0e3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/26215b7ee923b9251f7bb12c4e5f09dc465d35f2"
        }
      ],
      "title": "hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()",
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    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50334",
    "datePublished": "2025-09-15T14:49:48.608Z",
    "dateReserved": "2025-09-15T14:18:36.816Z",
    "dateUpdated": "2025-09-15T14:49:48.608Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50334\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:45.677\",\"lastModified\":\"2025-09-15T15:22:27.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nhugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()\\n\\nSyzkaller reports a null-ptr-deref bug as follows:\\n======================================================\\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\\nRIP: 0010:hugetlbfs_parse_param+0x1dd/0x8e0 fs/hugetlbfs/inode.c:1380\\n[...]\\nCall Trace:\\n \u003cTASK\u003e\\n vfs_parse_fs_param fs/fs_context.c:148 [inline]\\n vfs_parse_fs_param+0x1f9/0x3c0 fs/fs_context.c:129\\n vfs_parse_fs_string+0xdb/0x170 fs/fs_context.c:191\\n generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:231\\n do_new_mount fs/namespace.c:3036 [inline]\\n path_mount+0x12de/0x1e20 fs/namespace.c:3370\\n do_mount fs/namespace.c:3383 [inline]\\n __do_sys_mount fs/namespace.c:3591 [inline]\\n __se_sys_mount fs/namespace.c:3568 [inline]\\n __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n [...]\\n \u003c/TASK\u003e\\n======================================================\\n\\nAccording to commit \\\"vfs: parse: deal with zero length string value\\\",\\nkernel will set the param-\u003estring to null pointer in vfs_parse_fs_string()\\nif fs string has zero length.\\n\\nYet the problem is that, hugetlbfs_parse_param() will dereference the\\nparam-\u003estring, without checking whether it is a null pointer.  To be more\\nspecific, if hugetlbfs_parse_param() parses an illegal mount parameter,\\nsuch as \\\"size=,\\\", kernel will constructs struct fs_parameter with null\\npointer in vfs_parse_fs_string(), then passes this struct fs_parameter to\\nhugetlbfs_parse_param(), which triggers the above null-ptr-deref bug.\\n\\nThis patch solves it by adding sanity check on param-\u003estring\\nin hugetlbfs_parse_param().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/26215b7ee923b9251f7bb12c4e5f09dc465d35f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a8862820cbf1f18dca4f3b4c289d88561b3a384\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dcd28191be9bbf307ba51a5b485773a55b0037c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f2207145693ae5697a7b59e2add4b92f9e5b0e3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fa71639873518e3587632ae58e25e4a96b57fa90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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