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CVE-2022-49004

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

riscv: Sync efi page table's kernel mappings before switching

The EFI page table is initially created as a copy of the kernel page table. With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area: if the stack is allocated in a new PGD (one that was not present at the moment of the efi page table creation or not synced in a previous vmalloc fault), the kernel will take a trap when switching to the efi page table when the vmalloc kernel stack is accessed, resulting in a kernel panic.

Fix that by updating the efi kernel mappings before switching to the efi page table.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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          "options": [
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              "exploitation": "none"
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              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2024-10-22T13:14:45.523737Z"
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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            "arch/riscv/include/asm/efi.h",
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  "published": "2024-10-21T20:15:11.990",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "value": "NVD-CWE-noinfo"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Sync efi page table's kernel mappings before switching\n\nThe EFI page table is initially created as a copy of the kernel page table.\nWith VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area:\nif the stack is allocated in a new PGD (one that was not present at the\nmoment of the efi page table creation or not synced in a previous vmalloc\nfault), the kernel will take a trap when switching to the efi page table\nwhen the vmalloc kernel stack is accessed, resulting in a kernel panic.\n\nFix that by updating the efi kernel mappings before switching to the efi\npage table."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: riscv: Sincronizar las asignaciones de kernel de la tabla de páginas efi antes de cambiar La tabla de páginas efi se crea inicialmente como una copia de la tabla de páginas del kernel. Con VMAP_STACK habilitado, las pilas del kernel se asignan en el área vmalloc: si la pila se asigna en un nuevo PGD (uno que no estaba presente en el momento de la creación de la tabla de páginas efi o no se sincronizó en un error vmalloc anterior), el kernel tomará una trampa al cambiar a la tabla de páginas efi cuando se accede a la pila del kernel vmalloc, lo que resulta en un pánico del kernel. Solucione eso actualizando las asignaciones de kernel efi antes de cambiar a la tabla de páginas efi."
    }
  ],
  "lastModified": "2026-06-17T05:16:49.630",
  "configurations": [
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