CVE Database›Document archive›CVE-2021-1048

CVE-2021-1048

kernel: Use After Free in epoll_loop_check_proc() which could result in a local privilege escalation

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Severity

Important

Red Hat Product Security

7.8

CVSS 3.1

Review impact separately from score.

Published · September 2, 2021

Updated · November 21, 2025

Description

A use-after-free flaw was found in Linux kernel's ep_loop_check_proc in fs/eventpoll.c function in the filesystem. This flaw could allow an attacker to crash the system while polling for a file that is already committed to destruction. This vulnerability could lead to a kernel information leak and a privilege escalation problem.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

CVSS / CWE

CVSS 3.1 · 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-416 · Use After Free