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Vulnerability record · CVE-2021-3753 · published 16 February 2022

CVE-2021-3753: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

4.7 CVSS 3.1 Medium EPSS 0.36% · top 72.3% CWE-125 · Out-of-bounds readCWE-362 · Race condition
4.7CVSS 3.1 base score, v2 1.9
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1999589 Issue TrackingPatchThird Party Advisory
https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7 PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20221028-0003/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/09/01/4 ExploitMailing ListPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1999589 Issue TrackingPatchThird Party Advisory
https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7 PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20221028-0003/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/09/01/4 ExploitMailing ListPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3753), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.