CVE-2021-47058 Vulnerability Analysis & Exploit Details

CVE-2021-47058
Vulnerability Scoring

7.8
/10
Very High Risk

Highly exploitable, CVE-2021-47058 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-47058 Details

Status: Analyzed

Last updated: 🕠 10 Dec 2024, 17:54 UTC
Originally published on: 🕚 29 Feb 2024, 23:15 UTC

Time between publication and last update: 284 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE-2021-47058 Vulnerability Summary

CVE-2021-47058: In the Linux kernel, the following vulnerability has been resolved: regmap: set debugfs_name to NULL after it is freed There is a upstream commit cffa4b2122f5("regmap:debugfs: Fix a memory leak when calling regmap_attach_dev") that adds a if condition when create name for debugfs_name. With below function invoking logical, debugfs_name is freed in regmap_debugfs_exit(), but it is not created again because of the if condition introduced by above commit. regmap_reinit_cache() regmap_debugfs_exit() ... regmap_debugfs_init() So, set debugfs_name to NULL after it is freed.

Assessing the Risk of CVE-2021-47058

Access Complexity Graph

The exploitability of CVE-2021-47058 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-47058

CVE-2021-47058 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-47058, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-47058, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2021-47058 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2021-47058 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2021-47058 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.042% (probability of exploit)

EPSS Percentile: 5.02% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 94.98% of others.

CVE-2021-47058 References

External References

CWE Common Weakness Enumeration

CWE-416

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:4.19.168:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.168:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.169:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.169:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.170:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.170:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.171:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.171:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.172:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.172:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.173:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.173:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.174:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.174:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.175:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.175:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.176:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.176:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.177:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.177:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.178:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.178:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.179:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.179:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.180:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.180:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.181:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.181:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.182:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.182:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.183:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.183:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.184:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.184:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.185:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.185:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.186:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.186:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.187:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.187:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.188:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.188:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.189:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.189:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:4.19.190:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.190:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.4.90:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.91:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.92:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.94:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.4.94:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.4.95:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.96:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.97:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.98:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.99:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4:rc1:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4:rc2:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4:rc7:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.100:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.101:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.102:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.103:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.104:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.105:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.106:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.107:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.108:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.109:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.111:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.4.117:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.8:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.9:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.11:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.12:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.13:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.14:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.15:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.16:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.17:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.18:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.19:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.20:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.21:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.26:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.27:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.32:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.14:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.15:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.19:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*
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    cpe:2.3:o:linux:linux_kernel:5.12.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.3:*:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-47058: Combat Critical CVE Threats

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Other 5 Recently Published CVEs Vulnerabilities

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