---
id: "CVE-2021-1048"
kind: "vulnerability"
aliases: ["CVE-2021-1048"]
title: "Android Kernel: Android Kernel Use-After-Free Vulnerability"
severity: "high"
cvss: 7.8
epss: 0.01058
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Android Kernel", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["android", "exploited", "infrastructure", "mobile-fleet"]
not_affected_if: ["patched-device"]
published_at: "2021-12-15T19:15:14+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-1048", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-1048", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1048", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Android Kernel: Android Kernel Use-After-Free Vulnerability

A use-after-free bug in the Android kernel lets a local process corrupt freed memory and escalate its privileges. CISA lists it as actively exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Android Kernel affected ? fixed ?

## Fix

Apply the Android security patch that addresses CVE-2021-1048, per vendor instructions as CISA requires. Exact patch level: unknown

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-1048
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-1048
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-1048

## From the sources

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

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_