CVE-2021-3493
Scores
EPSS
Percentile: 76.4%
CVSS
CVSS Score: 7.4/10
All CVSS Scores
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Local (L)
Describes how the vulnerability is exploited
Attack Complexity
High (H)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
None (N)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
High (H)
Measures the impact to the confidentiality of information
Integrity Impact
High (H)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
High (H)
Measures the impact to the availability of the impacted component
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Local (L)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Authentication
None (N)
Describes the level of privileges an attacker must possess
Confidentiality Impact
Complete
Measures the impact to the confidentiality of information
Integrity Impact
Complete
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
Complete
Measures the impact to the availability of the impacted component
Description
The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.
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Sources
CWEs
Related Vulnerabilities
Exploits
Exploit ID: CVE-2021-3493
Source: cisa
URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Vulnerable Software (302)
Type: Configuration
Product: linux
Operating System: astra 1.6.9
{ "unaffected": true}
Source: astra
Type: Configuration
Product: linux
Operating System: astra 1.7.1.8
{ "unaffected": true}
Source: astra
Type: Configuration
Product: linux
Operating System: astra 4.7.1.8
{ "unaffected": true}
Source: astra
Type: Configuration
Product: linux
Operating System: ubuntu bionic 18.04
{ "fixed": "4.15.0-142.146"}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu focal 20.04
{ "fixed": "5.4.0-72.80"}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu groovy 20.10
{ "fixed": "5.8.0-50.56"}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu hirsute 21.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu impish 21.10
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu jammy 22.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu kinetic 22.10
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu lunar 23.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu mantic 23.10
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu noble 24.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu oracular 24.10
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu plucky 25.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu questing 25.10
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu trusty 14.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: ubuntu xenial 16.04
{ "fixed": "4.4.0-209.241"}
Source: ubuntu
Type: Configuration
Product: linux
Operating System: debian
{ "fixed": "5.10.38-1"}
Source: debian
Type: Configuration
Product: linux
Operating System: debian stretch 9
{ "unaffected": true}
Source: debian