FKIE_CVE-2024-36909

Vulnerability from fkie_nvd - Published: 2024-05-30 16:15 - Updated: 2025-09-30 17:54
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: Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. The VMBus ring buffer code could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the struct vmbus_gpadl for the ring buffers to decide whether to free the memory.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f622008bf784a9f5dd17baa19223cc2ac30a039Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/30d18df6567be09c1433e81993e35e3da573ac48Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82f9e213b124a7d2bb5b16ea35d570260ef467e0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9212a4e2963a7fbe3864ba33dc551d4ad8d0abbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2f622008bf784a9f5dd17baa19223cc2ac30a039Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/30d18df6567be09c1433e81993e35e3da573ac48Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/82f9e213b124a7d2bb5b16ea35d570260ef467e0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a9212a4e2963a7fbe3864ba33dc551d4ad8d0abbPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.9
linux linux_kernel 6.9
linux linux_kernel 6.9
To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: vmbus: Don\u0027t free ring buffers that couldn\u0027t be re-encrypted\n\nIn CoCo VMs it is possible for the untrusted host to cause\nset_memory_encrypted() or set_memory_decrypted() to fail such that an\nerror is returned and the resulting memory is shared. Callers need to\ntake care to handle these errors to avoid returning decrypted (shared)\nmemory to the page allocator, which could lead to functional or security\nissues.\n\nThe VMBus ring buffer code could free decrypted/shared pages if\nset_memory_decrypted() fails. Check the decrypted field in the struct\nvmbus_gpadl for the ring buffers to decide whether to free the memory."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Controladores: hv: vmbus: no liberar b\u00faferes de anillo que no se pudieron volver a cifrar. En las m\u00e1quinas virtuales CoCo, es posible que el host que no es de confianza cause set_memory_encrypted() o set_memory_decrypted( ) falle de modo que se devuelva un error y se comparta la memoria resultante. Las personas que llaman deben tener cuidado al manejar estos errores para evitar devolver memoria descifrada (compartida) al asignador de p\u00e1ginas, lo que podr\u00eda provocar problemas funcionales o de seguridad. El c\u00f3digo del buffer circular de VMBus podr\u00eda liberar p\u00e1ginas descifradas/compartidas si falla set_memory_decrypted(). Verifique el campo descifrado en la estructura vmbus_gpadl para ver los b\u00faferes en anillo para decidir si liberar la memoria."
    }
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  "id": "CVE-2024-36909",
  "lastModified": "2025-09-30T17:54:32.430",
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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",
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        "impactScore": 3.6,
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  "published": "2024-05-30T16:15:14.380",
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  "vulnStatus": "Analyzed",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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