CVE-2021-4203

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, service disruption.

Exploit odds

1.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-03-25 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:19 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.7% in the next 30 days (EPSS).
• Severity: 6.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-03-25 19:15 UTC

Last modified

2026-06-17 04:19 UTC

Exploit probability

1.7% · EPSS, next 30 days

Weakness

CWE-362 · Race condition

Record status

Modified

Affected

• Linux Kernel < 5.15
• Linux Kernel 5.15
• Netapp Active Iq Unified Manager
• Netapp e-series Santricity Os Controller ≤ 11.70.2
• Netapp Element Software
• Netapp Hci Management Node
• Netapp Solidfire
• Netapp Bootstrap Os

Attack profile CVSS 3.1 · 6.8

Attack vector

Network

Complexity

High

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-4203.md and follow it. Check whether this project is affected by CVE-2021-4203. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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