CVE-2024-47727

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-47727
In the Linux kernel, the following vulnerability has been resolved: x86/tdx: Fix "in-kernel MMIO" check TDX only supports kernel-initiated MMIO operations. The handle_mmio() function checks if the #VE exception occurred in the kernel and rejects the operation if it did not. However, userspace can deceive the kernel into performing MMIO on its behalf. For example, if userspace can point a syscall to an MMIO address, syscall does get_user() or put_user() on it, triggering MMIO #VE. The kernel will treat the #VE as in-kernel MMIO. Ensure that the target MMIO address is within the kernel before decoding instruction.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/18ecd5b74682839e7cdafb7cd1ec106df7baa18c Patch
https://git.kernel.org/stable/c/25703a3c980e21548774eea8c8a87a75c5c8f58c Patch
https://git.kernel.org/stable/c/4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee Patch
https://git.kernel.org/stable/c/bca2e29f7e26ce7c3522f8b324c0bd85612f68e3 Patch
https://git.kernel.org/stable/c/d4fc4d01471528da8a9797a065982e05090e1d81 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

23 Oct 2024, 20:32

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
CWE CWE-754
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
References () https://git.kernel.org/stable/c/18ecd5b74682839e7cdafb7cd1ec106df7baa18c - () https://git.kernel.org/stable/c/18ecd5b74682839e7cdafb7cd1ec106df7baa18c - Patch
References () https://git.kernel.org/stable/c/25703a3c980e21548774eea8c8a87a75c5c8f58c - () https://git.kernel.org/stable/c/25703a3c980e21548774eea8c8a87a75c5c8f58c - Patch
References () https://git.kernel.org/stable/c/4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee - () https://git.kernel.org/stable/c/4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee - Patch
References () https://git.kernel.org/stable/c/bca2e29f7e26ce7c3522f8b324c0bd85612f68e3 - () https://git.kernel.org/stable/c/bca2e29f7e26ce7c3522f8b324c0bd85612f68e3 - Patch
References () https://git.kernel.org/stable/c/d4fc4d01471528da8a9797a065982e05090e1d81 - () https://git.kernel.org/stable/c/d4fc4d01471528da8a9797a065982e05090e1d81 - Patch
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/tdx: Se corrige la comprobación "MMIO en el kernel" TDX solo admite operaciones MMIO iniciadas por el kernel. La función handle_mmio() comprueba si la excepción #VE se produjo en el kernel y rechaza la operación si no fue así. Sin embargo, el espacio de usuario puede engañar al kernel para que realice MMIO en su nombre. Por ejemplo, si el espacio de usuario puede apuntar una llamada al sistema a una dirección MMIO, la llamada al sistema realiza get_user() o put_user() en ella, lo que activa MMIO #VE. El kernel tratará el #VE como MMIO en el kernel. Asegúrese de que la dirección MMIO de destino esté dentro del kernel antes de decodificar la instrucción.

21 Oct 2024, 13:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-10-21 13:15

Updated : 2024-10-23 20:32

NVD link : CVE-2024-47727

Mitre link : CVE-2024-47727

CVE.ORG link : CVE-2024-47727

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-754

Improper Check for Unusual or Exceptional Conditions