CVE-2021-1048

Name: CVE-2021-1048
Creator: NVD / NIST
Published: 2021-12-15T19:15:14.917+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 1.05%

Last modified Jun 17, 2026

CVE-2021-1048 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 1.05% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

1.05%

59.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 13, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Google	Android	All versions

References

https://source.android.com/security/bulletin/2021-11-01Patch, Vendor Advisory
https://source.android.com/security/bulletin/2021-11-01Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1048Third Party Advisory, US Government Resource

Timeline

Published: Dec 15, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-1048?

How severe is CVE-2021-1048?

CVE-2021-1048 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.05% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-1048?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1048?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST