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CVE-2024-57945

Estado: ModificadaAlta (7.1)—

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

riscv: mm: Fix the out of bound issue of vmemmap address

In sparse vmemmap model, the virtual address of vmemmap is calculated as: ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT)). And the struct page's va can be calculated with an offset: (vmemmap + (pfn)).

However, when initializing struct pages, kernel actually starts from the first page from the same section that phys_ram_base belongs to. If the first page's physical address is not (phys_ram_base >> PAGE_SHIFT), then we get an va below VMEMMAP_START when calculating va for it's struct page.

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For example, if phys_ram_base starts from 0x82000000 with pfn 0x82000, the first page in the same section is actually pfn 0x80000. During init_unavailable_range(), we will initialize struct page for pfn 0x80000 with virtual address ((struct page *)VMEMMAP_START - 0x2000), which is below VMEMMAP_START as well as PCI_IO_END.

This commit fixes this bug by introducing a new variable 'vmemmap_start_pfn' which is aligned with memory section size and using it to calculate vmemmap address instead of phys_ram_base.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de out-of-bounds en memoria del kernel Linux (CWE-125) con acceso local y privilegios limitados. Permite lectura/escritura fuera de límites en vmemmap, potenciando escalada de privilegios (T1068) y ejecución de código o DoS (T1059/T1499.004).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Fix the out of bound issue of vmemmap address\n\nIn sparse vmemmap model, the virtual address of vmemmap is calculated as:\n((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT)).\nAnd the struct page's va can be calculated with an offset:\n(vmemmap + (pfn)).\n\nHowever, when initializing struct pages, kernel actually starts from the\nfirst page from the same section that phys_ram_base belongs to. If the\nfirst page's physical address is not (phys_ram_base >> PAGE_SHIFT), then\nwe get an va below VMEMMAP_START when calculating va for it's struct page.\n\nFor example, if phys_ram_base starts from 0x82000000 with pfn 0x82000, the\nfirst page in the same section is actually pfn 0x80000. During\ninit_unavailable_range(), we will initialize struct page for pfn 0x80000\nwith virtual address ((struct page *)VMEMMAP_START - 0x2000), which is\nbelow VMEMMAP_START as well as PCI_IO_END.\n\nThis commit fixes this bug by introducing a new variable\n'vmemmap_start_pfn' which is aligned with memory section size and using\nit to calculate vmemmap address instead of phys_ram_base."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: riscv: mm: Corrige el problema de salida de límites de la dirección vmemmap En el modelo vmemmap disperso, la dirección virtual de vmemmap se calcula como: ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT)). Y la va de la página de estructura se puede calcular con un desplazamiento: (vmemmap + (pfn)). Sin embargo, al inicializar las páginas de estructura, el kernel en realidad comienza desde la primera página de la misma sección a la que pertenece phys_ram_base. Si la dirección física de la primera página no es (phys_ram_base >> PAGE_SHIFT), obtenemos una va por debajo de VMEMMAP_START al calcular la va para su página de estructura. Por ejemplo, si phys_ram_base comienza desde 0x82000000 con pfn 0x82000, la primera página en la misma sección es en realidad pfn 0x80000. Durante init_unavailable_range(), inicializaremos struct page para pfn 0x80000 con dirección virtual ((struct page *)VMEMMAP_START - 0x2000), que está debajo de VMEMMAP_START y PCI_IO_END. Esta confirmación corrige este error al introducir una nueva variable 'vmemmap_start_pfn' que está alineada con el tamaño de la sección de memoria y la usa para calcular la dirección vmemmap en lugar de phys_ram_base."
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  "lastModified": "2026-08-04T11:22:32.510",
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