cve-2021-47461
Vulnerability from cvelistv5
Published
2024-05-22 06:23
Modified
2024-11-04 12:06
Severity ?
Summary
userfaultfd: fix a race between writeprotect and exit_mmap()
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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                "id": "CVE-2021-47461",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-22T18:15:05.306200Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/userfaultfd.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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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: fix a race between writeprotect and exit_mmap()\n\nA race is possible when a process exits, its VMAs are removed by\nexit_mmap() and at the same time userfaultfd_writeprotect() is called.\n\nThe race was detected by KASAN on a development kernel, but it appears\nto be possible on vanilla kernels as well.\n\nUse mmget_not_zero() to prevent the race as done in other userfaultfd\noperations."
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      "title": "userfaultfd: fix a race between writeprotect and exit_mmap()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47461",
    "datePublished": "2024-05-22T06:23:22.373Z",
    "dateReserved": "2024-05-22T06:20:56.197Z",
    "dateUpdated": "2024-11-04T12:06:23.637Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47461\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:11.040\",\"lastModified\":\"2024-05-22T12:46:53.887\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nuserfaultfd: fix a race between writeprotect and exit_mmap()\\n\\nA race is possible when a process exits, its VMAs are removed by\\nexit_mmap() and at the same time userfaultfd_writeprotect() is called.\\n\\nThe race was detected by KASAN on a development kernel, but it appears\\nto be possible on vanilla kernels as well.\\n\\nUse mmget_not_zero() to prevent the race as done in other userfaultfd\\noperations.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: userfaultfd: corrige una ejecuci\u00f3n entre writeprotect y exit_mmap() Una ejecuci\u00f3n es posible cuando un proceso sale, sus VMA son eliminados por exit_mmap() y al mismo tiempo se llama a userfaultfd_writeprotect() . KASAN detect\u00f3 la ejecuci\u00f3n en un n\u00facleo de desarrollo, pero parece ser posible tambi\u00e9n en n\u00facleos de vainilla. Utilice mmget_not_zero() para evitar la ejecuci\u00f3n como se hace en otras operaciones de userfaultfd.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035aca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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