CVE-2021-39698
kernel: use-after-free in the file polling implementation
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · March 7, 2022
Updated · November 22, 2025
Description
A vulnerability was found in the Linux kernel’s file polling implementation in kernel/sched/wait.c., which leads to a use-after-free problem. This flaw allows a local user to cause a denial of service (memory corruption or crash) or privilege escalation.
Statement
There was no shipped kernel version that was seen affected by this 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 · 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 · Use After Free