// For flags

CVE-2024-35987

riscv: Fix loading 64-bit NOMMU kernels past the start of RAM

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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

riscv: Fix loading 64-bit NOMMU kernels past the start of RAM

commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the linear
mapping") added logic to allow using RAM below the kernel load address.
However, this does not work for NOMMU, where PAGE_OFFSET is fixed to the
kernel load address. Since that range of memory corresponds to PFNs
below ARCH_PFN_OFFSET, mm initialization runs off the beginning of
mem_map and corrupts adjacent kernel memory. Fix this by restoring the
previous behavior for NOMMU kernels.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: riscv: se corrigió la carga de kernels NOMMU de 64 bits después del inicio de la confirmación de RAM. 3335068f8721 ("riscv: use páginas PUD/P4D/PGD para el mapeo lineal") se agregó lógica para permitir el uso RAM debajo de la dirección de carga del kernel. Sin embargo, esto no funciona para NOMMU, donde PAGE_OFFSET está fijado a la dirección de carga del kernel. Dado que ese rango de memoria corresponde a los PFN por debajo de ARCH_PFN_OFFSET, la inicialización de mm se ejecuta desde el principio de mem_map y corrompe la memoria del kernel adyacente. Solucione este problema restaurando el comportamiento anterior de los núcleos NOMMU.

*Credits: N/A
CVSS Scores
Attack Vector
-
Attack Complexity
-
Privileges Required
-
User Interaction
-
Scope
-
Confidentiality
-
Integrity
-
Availability
-
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-17 CVE Reserved
  • 2024-05-20 CVE Published
  • 2024-05-21 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.4 < 6.6.30
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.4 < 6.6.30"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.4 < 6.8.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.4 < 6.8.9"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.4 < 6.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.4 < 6.9"
en
Affected