⚠ Actively exploited
Added to CISA KEV on 2022-05-23. Federal agencies required to patch by 2022-06-13. Required action: Apply updates per vendor instructions..

CVE-2021-1048 — Use After Free in Google Android

CWE-416 — Use After Free16 documents12 sources
Severity
7.8HIGHNVD
EPSS
1.3%
top 20.58%
CISA KEV
KEV
Added 2022-05-23
Due 2022-06-13
Exploit
Exploited in wild
Active exploitation observed
Affected products
3
Linux KernelDebian LinuxGoogle Android
Timeline
PublishedDec 15
KEV addedMay 23
KEV dueJun 13
Latest updateDec 3
CISA Required Action: Apply updates per vendor instructions.

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 vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages3 packages

▶Debianlinux/linux_kernel< 5.8.10-1+3
▶debiandebian/linux< linux 5.8.10-1 (bookworm)

Patches

Patch: source.android.com ↗Patch: source.android.com ↗

🔴Vulnerability Details

6
Project0
The More You Know, The More You Know You Don’t Know - Project Zero↗2022-04-01
▶
GHSA
GHSA-r535-rfwp-fm57: In ep_loop_check_proc of eventpoll↗2021-12-16
▶
OSV
CVE-2021-1048: In ep_loop_check_proc of eventpoll↗2021-12-15
▶
OSV
CVE-2021-1048: In ep_loop_check_proc of eventpoll↗2021-11-01
▶
VulnCheck
Android Kernel Use-After-Free Vulnerability↗2021
▶

📋Vendor Advisories

4
CISA
Android Kernel Use-After-Free Vulnerability↗2022-05-23
▶
Android
CVE-2021-1048: Kernel↗2021-11-01
▶
Red Hat
kernel: Use After Free in epoll_loop_check_proc() which could result in a local privilege escalation↗2021-09-02
▶
Debian
CVE-2021-1048: linux - In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory ...↗2021
▶

🕵️Threat Intelligence

4
Mandiant
Intellexa’s Prolific Zero-Day Exploits Continue↗2025-12-03
▶
Mandiant
Sanctioned but Still Spying: Intellexa’s Prolific Zero-Day Exploits Continue↗2025-12-03
▶
Talos
Mercenary mayhem: A technical analysis of Intellexa's PREDATOR spyware↗2023-05-25
▶
Talos
Mercenary mayhem: A technical analysis of Intellexa&#x27;s PREDATOR spyware↗2023-05-25
▶

💬Community

1
Bugzilla
CVE-2021-1048 kernel: Use After Free in epoll_loop_check_proc() which could result in a local privilege escalation↗2021-12-13
▶
CVE-2021-1048 — Use After Free in Google Android | cvebase