What’s Vulnerable › Vulnerabilities

CVE-2021-3753

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-02-16 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• Linux kernel: before 5.15 — fixed in 5.15
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• NetApp Bootstrap Os: all versions
• NetApp Element Software: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700S Firmware: all versions
• NetApp Hci Management Node: all versions
• NetApp Solidfire: all versions
• Red Hat Enterprise Linux: 7.0, 8.0

How to fix

Upgrade to a fixed version: Linux kernel 5.15. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1999589
• https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7
• https://security.netapp.com/advisory/ntap-20221028-0003/
• https://www.openwall.com/lists/oss-security/2021/09/01/4
• https://bugzilla.redhat.com/show_bug.cgi?id=1999589
• https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7
• https://security.netapp.com/advisory/ntap-20221028-0003/
• https://www.openwall.com/lists/oss-security/2021/09/01/4

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