MEDIUM
CVE-2021-3753
CWE-125Published: February 16, 2022· Updated: Jun 17, 2026
4.7
CVSS v3.1
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.
Technical Analysis
CVE-2021-3753 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 4.7.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (8)
→
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
Quick Facts
CVE IDCVE-2021-3753
CVSS Score4.7 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected3 vendor(s)
PublishedFeb 16, 2022
Related CVEs (CWE-125)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-3753 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.