Security Vulnerability CVE-2021-1048 - Complete Analysis and Details

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CVE-2021-1048

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National Vulnerability Database Information

Description: 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

CVSS Base Score: 7.8 (v3.1)

The **CVSS Base Score** is a score from **0 to 10** that represents the intrinsic severity of a vulnerability. A higher score indicates greater severity.

Value

0.02.55.07.510.0

Published on: 12/15/2021 19:15:14
Last modified: 10/23/2025 14:53:12
NIST: CVE source from the National Vulnerability Database (NVD)

CVSS Metrics Details

Base Severity: HIGH
Vector String: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector: LOCAL
Attack Complexity: LOW
Privileges Required: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: HIGH

Common Weakness Enumeration (CWE)

Database CWE: v4.18

CWE-416: Use After Free ↗

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Fonte: MITRE CWE

FIRST Information

EPSS Score: 0.0223

The **EPSS (Exploit Prediction Scoring System)** is a score from **0 to 1** that indicates the **probability** that a vulnerability will be exploited in the real world in the next 30 days. A higher value indicates a greater likelihood of exploitation.

Value

0.00.250.50.751.0

Percentile: 0.8397

The **Percentile** indicates how much higher this vulnerability's EPSS score is compared to all other vulnerabilities in the EPSS database. For example, a percentile of 0.90 (90%) means that 90% of vulnerabilities have an EPSS score equal to or lower than the current one.

Value

0.00.250.50.751.0

*Data updated as of: 2025-12-08

CISA Information (Known Exploited Vulnerabilities)

The **CISA KEV Catalog** lists vulnerabilities that have been **actively exploited in the real world**. If a CVE is present in this catalog, it indicates that the threat is immediate and mitigation should be a top priority.

CVE **CVE-2021-1048** **IS PRESENT** in the CISA KEV Catalog!

Vulnerability Name: Android Kernel Use-After-Free Vulnerability
Short Description: Android kernel contains a use-after-free vulnerability that allows for privilege escalation.
Date Added to KEV: 05/23/2022
Vendor/Product: Android / Kernel
Required Action: Apply updates per vendor instructions.
Due Date: 06/13/2022

Articles published on Red Hot Cyber

NVD References

Exploit PoC from GitHub

No results found on GitHub for this CVE.