// For flags

CVE-2021-21781

kernel: arm: SIGPAGE information disclosure vulnerability

Severity Score

3.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

Se presenta una vulnerabilidad de divulgación de información en la funcionalidad ARM SIGPAGE del Kernel de Linux versiones v5.4.66 y v5.4.54. La última versión (5.11-rc4) parece seguir siendo vulnerable. Una aplicación de userland puede leer el contenido de la sigpage, que puede filtrar el contenido de la memoria del kernel. Un atacante puede leer la memoria de un proceso en un desplazamiento específico para desencadenar esta vulnerabilidad. Esto fue corregido en las versiones del kernel: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

An information disclosure flaw exists in the ARM SIGPAGE functionality of the Linux kernel. An attacker with a local account can read the contents of the sigpage, which contains previously initialized kernel memory contents. This flaw requires an attacker to read a process’s memory at a specific offset to trigger this vulnerability.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-01-04 CVE Reserved
  • 2021-08-18 CVE Published
  • 2023-03-11 EPSS Updated
  • 2024-08-03 CVE Updated
  • 2024-08-03 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-908: Use of Uninitialized Resource
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"
 5.4.54
Search vendor "Linux" for product "Linux Kernel" and version "5.4.54"
-
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 5.4.66
Search vendor "Linux" for product "Linux Kernel" and version "5.4.66"
-
Affected
Oracle
Search vendor "Oracle"
 Communications Cloud Native Core Binding Support Function
Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function"
 22.1.3
Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" and version "22.1.3"
-
Affected
Oracle
Search vendor "Oracle"
 Communications Cloud Native Core Network Exposure Function
Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function"
 22.1.1
Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" and version "22.1.1"
-
Affected
Oracle
Search vendor "Oracle"
 Communications Cloud Native Core Policy
Search vendor "Oracle" for product "Communications Cloud Native Core Policy"
 22.2.0
Search vendor "Oracle" for product "Communications Cloud Native Core Policy" and version "22.2.0"
-
Affected