FKIE_CVE-2022-49077

Vulnerability from fkie_nvd - Published: 2025-02-26 07:00 - Updated: 2025-10-14 20:26
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) If an mremap() syscall with old_size=0 ends up in move_page_tables(), it will call invalidate_range_start()/invalidate_range_end() unnecessarily, i.e. with an empty range. This causes a WARN in KVM's mmu_notifier. In the past, empty ranges have been diagnosed to be off-by-one bugs, hence the WARNing. Given the low (so far) number of unique reports, the benefits of detecting more buggy callers seem to outweigh the cost of having to fix cases such as this one, where userspace is doing something silly. In this particular case, an early return from move_page_tables() is enough to fix the issue.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01e67e04c28170c47700c2c226d732bbfedb1ad0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04bc13dae4a27b8d030843c85ae452bb2f1d9c1fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2358aa84ef6dafcf544a557caaa6b91afb4a0bd2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d659cb1763ff17d1c6ee082fa6feb4267c7a30bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a05540f3903bd8295e8c4cd90dd3d416239a115bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2c328c2a8f9de8b761bd4025b66c63120c55761Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eeaf28e2a0128147d687237e59d5407ee1b14693Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.18
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)\n\nIf an mremap() syscall with old_size=0 ends up in move_page_tables(), it\nwill call invalidate_range_start()/invalidate_range_end() unnecessarily,\ni.e.  with an empty range.\n\nThis causes a WARN in KVM\u0027s mmu_notifier.  In the past, empty ranges\nhave been diagnosed to be off-by-one bugs, hence the WARNing.  Given the\nlow (so far) number of unique reports, the benefits of detecting more\nbuggy callers seem to outweigh the cost of having to fix cases such as\nthis one, where userspace is doing something silly.  In this particular\ncase, an early return from move_page_tables() is enough to fix the\nissue."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mmmremap.c: evitar invalidate_range_start/end in\u00fatil en mremap(old_size=0) Si una llamada al sistema mremap() con old_size=0 termina en move_page_tables(), llamar\u00e1 a invalidate_range_start()/invalidate_range_end() innecesariamente, es decir, con un rango vac\u00edo. Esto provoca una ADVERTENCIA en mmu_notifier de KVM. En el pasado, se ha diagnosticado que los rangos vac\u00edos eran errores con un desfase de uno, de ah\u00ed la ADVERTENCIA. Dado el bajo n\u00famero (hasta ahora) de informes \u00fanicos, los beneficios de detectar m\u00e1s llamadores con errores parecen superar el costo de tener que arreglar casos como este, donde el espacio de usuario est\u00e1 haciendo algo tonto. En este caso particular, un retorno temprano de move_page_tables() es suficiente para solucionar el problema."
    }
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  "id": "CVE-2022-49077",
  "lastModified": "2025-10-14T20:26:33.417",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-02-26T07:00:45.043",
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  "vulnStatus": "Analyzed",
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}


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  • 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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