CVE-2021-4203

Updated: 2025-08-20 02:15:20.808782

Description:

A use-after-free read flaw was found in sock_getsockopt() in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() (and connect()) in the Linux kernel. In this flaw, an attacker with a user privileges may crash the system or leak internal kernel information.


Links NIST CIRCL RHEL Ubuntu

Severity

Severity Score
CVSS Version 2.x MEDIUM 4.9
CVSS Version 3.x MEDIUM 6.8

Status

OS name Project name Version Score Severity Status Errata Last updated

Statement

AlmaLinux 9.2 ESU kernel 5.14.0 6.8 MEDIUM Ignored 2023-11-21 04:12:17 Deprioritize this issue because, despite the AV:N label, exploitation requires a local unprivileged ...
CentOS 6 ELS kernel 2.6.32 6.8 MEDIUM Ignored 2022-06-26 11:38:50 Ignored due to low severity
CentOS 7 ELS kernel 3.10.0 6.8 MEDIUM Ignored 2023-09-19 09:29:59 Ignored due to low severity
CentOS 8.4 ELS kernel 4.18.0 6.8 MEDIUM Released CLSA-2023:1701963303 2023-12-07 16:27:52
CentOS 8.5 ELS kernel 4.18.0 6.8 MEDIUM Released CLSA-2023:1701962635 2023-12-07 10:26:53
CentOS Stream 8 ELS kernel 4.18.0 6.8 MEDIUM Ignored 2024-05-24 14:19:04 Ignored due to low severity
CloudLinux 6 ELS kernel 2.6.32 6.8 MEDIUM Ignored 2022-06-26 11:38:50 Ignored due to low severity
CloudLinux 7 ELS kernel 3.10.0 6.8 MEDIUM Ignored 2024-09-06 12:12:15 Ignored due to low severity
Oracle Linux 6 ELS kernel 2.6.32 6.8 MEDIUM Ignored 2022-12-02 16:06:08 Ignored due to low severity
Ubuntu 16.04 ELS linux-hwe 4.15.0 6.8 MEDIUM Already Fixed 2023-04-21 03:22:32
Total: 12