CVE-2021-3753

Name: CVE-2021-3753
Creator: NVD / NIST
Published: 2022-02-16T19:15:08.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.7/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2021-3753 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl (KDSETMDE). The highest threat from this vulnerability is to data confidentiality.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl (KDSETMDE). The highest threat from this vulnerability is to data confidentiality.

Metrics

CVSS 3.1

4.7/10

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

EPSS Probability

0.36%

28.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.15
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Netapp	Active Iq Unified Manager	All versions
Netapp	Element Software	All versions
Netapp	Hci Management Node	All versions
Netapp	Solidfire	All versions
Netapp	Bootstrap Os	All versions
Netapp	H300s Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H410s Firmware	All versions
Netapp	H410c Firmware	All versions

References

https://bugzilla.redhat.com/show_bug.cgi?id=1999589Issue Tracking, Patch, Third Party Advisory
https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20221028-0003/Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/09/01/4Exploit, Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1999589Issue Tracking, Patch, Third Party Advisory
https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20221028-0003/Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/09/01/4Exploit, Mailing List, Patch, Third Party Advisory

Timeline

Published: Feb 16, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3753?

How severe is CVE-2021-3753?

CVE-2021-3753 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3753?

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-2021-3753?

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

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Source: NVD / NIST