// For flags

CVE-2021-22566

Incorrect mapping of Executable bits in Fuchsia Kernel

Severity Score

5.1
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

An incorrect setting of UXN bits within mmu_flags_to_s1_pte_attr lead to privileged executable pages being mapped as executable from an unprivileged context. This can be leveraged by an attacker to bypass executability restrictions of kernel-mode pages from user-mode. An incorrect setting of PXN bits within mmu_flags_to_s1_pte_attr lead to unprivileged executable pages being mapped as executable from a privileged context. This can be leveraged by an attacker to bypass executability restrictions of user-mode pages from kernel-mode. Typically this allows a potential attacker to circumvent a mitigation, making exploitation of potential kernel-mode vulnerabilities easier. We recommend updating kernel beyond commit 7d731b4e9599088ac3073956933559da7bca6a00 and rebuilding.

Una configuración incorrecta de los bits UXN dentro de mmu_flags_to_s1_pte_attr conlleva a que las páginas ejecutables privilegiadas sean mapeadas como ejecutables desde un contexto no privilegiado. Esto puede ser aprovechado por un atacante para omitir las restricciones de ejecución de las páginas en modo kernel desde el modo usuario. Una configuración incorrecta de los bits PXN dentro de mmu_flags_to_s1_pte_attr conlleva a que páginas ejecutables no privilegiadas sean mapeadas como ejecutables desde un contexto con privilegios. Esto puede ser aprovechado por un atacante para omitir las restricciones de ejecución de las páginas en modo usuario desde el modo kernel. Normalmente, esto permite a un atacante potencial omitir una mitigación, facilitando la explotación de posibles vulnerabilidades en modo kernel. Recomendamos actualizar el kernel más allá del commit 7d731b4e9599088ac3073956933559da7bca6a00 y reconstruirlo

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
Low
Low
Integrity
Low
Low
Availability
None
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-01-05 CVE Reserved
  • 2022-01-18 CVE Published
  • 2023-08-11 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-275: Permission Issues
  • CWE-732: Incorrect Permission Assignment for Critical Resource
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Google
Search vendor "Google"
Fuchsia
Search vendor "Google" for product "Fuchsia"
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Affected