CVE-2021-1048: Technical Deep-Dive (Auto Refreshed)

Generated on 2026-03-30T13:04:38.443Z. This file is automatically regenerated every 30 minutes by the CVE AI enrichment job using web sources (NVD, MITRE, CISA KEV, GitHub).

Executive Technical Summary

In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel

• Context preserved from previous revision: In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel Notes: 渗透测试有关的POC、EXP、脚本、提权、小工具等---About penetration-testing python-script poc getshell csrf xss cms php-getshell domainmod-xss csrf-webshell cobub-razor cve rce sql sql-poc poc-exp bypass oa-getshell cve-cms

Technical Details

• CVE: CVE-2021-1048
• KEV date added: 2022-05-23
• KEV due date: 2022-06-13
• NVD published: 2021-12-15
• NVD modified: 2025-10-23
• MITRE modified: 2025-10-21
• CVSS base score: 7.8
• CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
• CVSS exploitability score: 1.8
• CVSS impact score: 5.9
• Attack vector: Local
• Attack complexity: Low
• Privileges required: Low
• User interaction: None
• Scope: Unchanged
• Confidentiality impact: High
• Integrity impact: High
• Availability impact: High

Versions and Products Impacted

• google / android
• n/a / Android (versions: Android kernel)

Weakness Classification

• CWE-416
• Elevation of privilege

Repositories for Lab Validation (Public Examples)

• Mr-xn/Penetration_Testing_POC | stars: 7289 | updated: 2026-03-30 | https://github.com/Mr-xn/Penetration_Testing_POC
  Notes: 渗透测试有关的POC、EXP、脚本、提权、小工具等---About penetration-testing python-script poc getshell csrf xss cms php-getshell domainmod-xss csrf-webshell cobub-razor cve rce sql sql-poc poc-exp bypass oa-getshell cve-cms

People and Organizations Mentioned

• google_android
• Android
• Kernel
• Mr-xn

Practical Defensive Validation (Authorized Only)

1. Use only isolated environments and systems you own or are explicitly authorized to test.
2. Snapshot infrastructure before validation and preserve baseline logs (EDR, SIEM, OS, app).
3. Create low-privilege users on google / android and validate that patching blocks unauthorized admin-level actions.
4. Compare token/privilege transitions in Windows Event Logs before and after remediation.
5. Tune detections for unusual group membership changes and SYSTEM-level process launches from user sessions.

References

• NVD record: https://nvd.nist.gov/vuln/detail/CVE-2021-1048
• MITRE CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1048
• CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• CISA KEV JSON feed: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
• KEV notes: https://nvd.nist.gov/vuln/detail/CVE-2021-1048
• https://source.android.com/security/bulletin/2021-11-01
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1048
• Repository example: https://github.com/Mr-xn/Penetration_Testing_POC

This content is for defensive security training and authorized validation only.