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?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2021-4203 patch availability.

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

6 total

Bugs
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

Exploit Issue Tracking Patch Third Party Advisory
Kernel Git
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306eb23814

Patch Vendor Advisory
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=2036934

Issue Tracking Patch Third Party Advisory
Oracle
https://www.oracle.com/security-alerts/cpujul2022.html

Patch Third Party Advisory
Kernel.org
https://lore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com/T/

Showing 5 of 6 references 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?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2021-4203 patch availability.
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.