// For flags

CVE-2020-12114

kernel: DoS by corrupting mountpoint reference counter

Severity Score

4.7
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A pivot_root race condition in fs/namespace.c in the Linux kernel 4.4.x before 4.4.221, 4.9.x before 4.9.221, 4.14.x before 4.14.178, 4.19.x before 4.19.119, and 5.x before 5.3 allows local users to cause a denial of service (panic) by corrupting a mountpoint reference counter.

Una condición de carrera en la función pivot_root en el archivo fs/namespace.c en el kernel de Linux versiones 4.4.x anteriores a la versión 4.4.221, versiones 4.9.x anteriores a la versión 4.9.221, versiones 4.14.x anteriores a la versión 4.14.178, versiones 4.19.x anteriores a 4.19.119, y versiones 5.x anteriores a la versión 5.3, permite a usuarios locales causar una denegación de servicio (pánico) al corromper un contador de referencia de punto de montaje.

A flaw was found in the Linux kernel’s implementation of the pivot_root syscall. This flaw allows a local privileged user (root outside or root inside a privileged container) to exploit a race condition to manipulate the reference count of the root filesystem. To be able to abuse this flaw, the process or user calling pivot_root must have advanced permissions. The highest threat from this vulnerability is to system availability.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-04-23 CVE Reserved
  • 2020-05-04 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
  • CWE-400: Uncontrolled Resource Consumption
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"
 >= 4.4.0 < 4.4.221
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.0 < 4.4.221"
-
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9.0 < 4.9.221
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9.0 < 4.9.221"
-
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.14 < 4.14.178
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 4.14.178"
-
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.19 < 4.19.119
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 4.19.119"
-
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.0 < 5.3
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.3"
-
Affected