CVE-2021-4202

Name: CVE-2021-4202
Creator: NVD / NIST
Published: 2022-03-25T19:15:09.77+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2021-4202 is a high-severity vulnerability rated 7/10 on the CVSS scale. A use-after-free flaw was found in nci_request in net/nfc/nci/core.c in NFC Controller Interface (NCI) in the Linux kernel. This flaw could allow a local attacker with user privileges to cause a data race problem while the device is getting removed, leading to a privilege escalation problem.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

A use-after-free flaw was found in nci_request in net/nfc/nci/core.c in NFC Controller Interface (NCI) in the Linux kernel. This flaw could allow a local attacker with user privileges to cause a data race problem while the device is getting removed, leading to a privilege escalation problem.

Metrics

CVSS 3.1

7/10

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

EPSS Probability

0.36%

27.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 3.2, < 4.4.294
Linux	Linux Kernel	>= 4.5, < 4.9.292
Linux	Linux Kernel	>= 4.10, < 4.14.257
Linux	Linux Kernel	>= 4.15, < 4.19.219
Linux	Linux Kernel	>= 4.20, < 5.4.163
Linux	Linux Kernel	>= 5.5.0, < 5.10.82
Linux	Linux Kernel	>= 5.11, < 5.15.5

References

http://www.openwall.com/lists/oss-security/2022/06/01/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/06/04/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/06/07/2Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2036682Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3e3b5dfcd16a3e254aab61bd1e8c417dd4503102Exploit, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=48b71a9e66c2eab60564b1b1c85f4928ed04e406Exploit, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=86cdf8e38792545161dbe3350a7eced558ba4d15Exploit, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220513-0002/Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/06/01/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/06/04/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/06/07/2Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2036682Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3e3b5dfcd16a3e254aab61bd1e8c417dd4503102Exploit, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=48b71a9e66c2eab60564b1b1c85f4928ed04e406Exploit, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=86cdf8e38792545161dbe3350a7eced558ba4d15Exploit, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220513-0002/Third Party Advisory

Timeline

Published: Mar 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4202?

How severe is CVE-2021-4202?

CVE-2021-4202 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4202?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4202?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST