CVE-2024-49858

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-49858
In the Linux kernel, the following vulnerability has been resolved: efistub/tpm: Use ACPI reclaim memory for event log to avoid corruption The TPM event log table is a Linux specific construct, where the data produced by the GetEventLog() boot service is cached in memory, and passed on to the OS using an EFI configuration table. The use of EFI_LOADER_DATA here results in the region being left unreserved in the E820 memory map constructed by the EFI stub, and this is the memory description that is passed on to the incoming kernel by kexec, which is therefore unaware that the region should be reserved. Even though the utility of the TPM2 event log after a kexec is questionable, any corruption might send the parsing code off into the weeds and crash the kernel. So let's use EFI_ACPI_RECLAIM_MEMORY instead, which is always treated as reserved by the E820 conversion logic.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/11690d7e76842f29b60fbb5b35bc97d206ea0e83 Patch
https://git.kernel.org/stable/c/19fd2f2c5fb36b61506d3208474bfd8fdf1cada3 Patch
https://git.kernel.org/stable/c/2e6871a632a99d9b9e2ce3a7847acabe99e5a26e Patch
https://git.kernel.org/stable/c/38d9b07d99b789efb6d8dda21f1aaad636c38993 Patch
https://git.kernel.org/stable/c/5b22c038fb2757c652642933de5664da471f8cb7 Patch
https://git.kernel.org/stable/c/77d48d39e99170b528e4f2e9fc5d1d64cdedd386 Patch
https://git.kernel.org/stable/c/f76b69ab9cf04358266e3cea5748c0c2791fbb08 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

23 Oct 2024, 16:35

Type Values Removed Values Added
CWE NVD-CWE-noinfo
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: efistub/tpm: Utilizar la memoria de recuperación ACPI para el registro de eventos para evitar la corrupción La tabla de registro de eventos TPM es una construcción específica de Linux, donde los datos producidos por el servicio de arranque GetEventLog() se almacenan en caché en la memoria y se pasan al sistema operativo mediante una tabla de configuración EFI. El uso de EFI_LOADER_DATA aquí da como resultado que la región quede sin reservar en el mapa de memoria E820 construido por el stub EFI, y esta es la descripción de memoria que se pasa al kernel entrante por kexec, que por lo tanto no sabe que la región debe reservarse. Aunque la utilidad del registro de eventos TPM2 después de un kexec es cuestionable, cualquier corrupción podría enviar el código de análisis a la maleza y bloquear el kernel. Así que usemos EFI_ACPI_RECLAIM_MEMORY en su lugar, que siempre se trata como reservado por la lógica de conversión E820.
References () https://git.kernel.org/stable/c/11690d7e76842f29b60fbb5b35bc97d206ea0e83 - () https://git.kernel.org/stable/c/11690d7e76842f29b60fbb5b35bc97d206ea0e83 - Patch
References () https://git.kernel.org/stable/c/19fd2f2c5fb36b61506d3208474bfd8fdf1cada3 - () https://git.kernel.org/stable/c/19fd2f2c5fb36b61506d3208474bfd8fdf1cada3 - Patch
References () https://git.kernel.org/stable/c/2e6871a632a99d9b9e2ce3a7847acabe99e5a26e - () https://git.kernel.org/stable/c/2e6871a632a99d9b9e2ce3a7847acabe99e5a26e - Patch
References () https://git.kernel.org/stable/c/38d9b07d99b789efb6d8dda21f1aaad636c38993 - () https://git.kernel.org/stable/c/38d9b07d99b789efb6d8dda21f1aaad636c38993 - Patch
References () https://git.kernel.org/stable/c/5b22c038fb2757c652642933de5664da471f8cb7 - () https://git.kernel.org/stable/c/5b22c038fb2757c652642933de5664da471f8cb7 - Patch
References () https://git.kernel.org/stable/c/77d48d39e99170b528e4f2e9fc5d1d64cdedd386 - () https://git.kernel.org/stable/c/77d48d39e99170b528e4f2e9fc5d1d64cdedd386 - Patch
References () https://git.kernel.org/stable/c/f76b69ab9cf04358266e3cea5748c0c2791fbb08 - () https://git.kernel.org/stable/c/f76b69ab9cf04358266e3cea5748c0c2791fbb08 - Patch
First Time Linux linux Kernel
Linux

21 Oct 2024, 13:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-10-21 13:15

Updated : 2024-10-23 16:35

NVD link : CVE-2024-49858

Mitre link : CVE-2024-49858

CVE.ORG link : CVE-2024-49858

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo