What is CVE-2021-4203?

CVE-2021-4203 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.8 out of 10, classified as a Race Condition flaw (CWE-362). CVE-2021-4203 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-4203?

CVE-2021-4203 has a CVSS score of 6.8 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2021-4203?

No patch is currently available for CVE-2021-4203. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-4203 actively exploited?

CVE-2021-4203 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/362.html

CVE-2021-4203

Medium

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.

Package Linux Kernel

Published 2022-03-25

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

6.8

out of 10

Medium

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-362

CVE-2021-4203 is a Race Condition vulnerability

What is Race Condition?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-4203 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel.org
https://lore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com/T/
Security
https://security.netapp.com/advisory/ntap-20221111-0003/

Third Party Advisory
Kernel patch commit
https://bugs.chromium.org/p/project-zero/issues/detail?id=2230&can=7&q=modified-after%3Atoday-30&sort=-modified&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified%20Cve&cells=tiles&redir=1
Patch
Kernel patch commit
https://bugzilla.redhat.com/show_bug.cgi?id=2036934
Patch
Kernel patch commit
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306eb23814
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2021-4203

Severity Medium

CVSS score 6.8 / 10

CVSS version 3.1

Published 2022-03-25

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-4203?

CVE-2021-4203 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.8 out of 10 , classified as a Race Condition flaw (CWE-362) . CVE-2021-4203 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-4203?

CVE-2021-4203 has a CVSS score of 6.8 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2021-4203?

No patch is currently available for CVE-2021-4203. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-4203 actively exploited?

No — CVE-2021-4203 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. View CWE-362 on MITRE CWE →