CVE-2021-3753 Race condition in kernel

What is CVE-2021-3753?

CVE-2021-3753 is a medium-severity vulnerability in Linux kernel, published on 16 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-362, CWE-125

Which versions are affected by CVE-2021-3753?

It affects 12 products.

Products include Linux kernel, Netapp Active Iq Unified Manager, Netapp Bootstrap Os, Netapp Element Software, Netapp H300s Firmware, Netapp H410c Firmware and 6 more.

How do I fix CVE-2021-3753?

Apply the vendor's patch.

Is CVE-2021-3753 being exploited?

There is no known exploitation of CVE-2021-3753 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made

Also known as A-222023207, DEBIAN-CVE-2021-3753, PUB-A-222023207, UBUNTU-CVE-2021-3753.