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CVE-2021-3753· NVD / CVE Program· CNA redhat

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 t

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.36% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: linux (Debian:11) 5.10.46-5; linux (Debian:12) 5.14.6-1; linux (Debian:9) 4.9.290-1.

Low priority for now. Upgrade to linux (Debian:11) 5.10.46-5; linux (Debian:12) 5.14.6-1; linux (Debian:9) 4.9.290-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Feb 16, 2022
Updated
Jun 17, 2026
EPSS
0.4% · 29th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatenterprise linux
netappactive iq unified manager
netappelement software
netapphci management node
netappsolidfire
netappbootstrap os
netapphci compute node
netapph300s firmware
netapph300s
netapph500s firmware
netapph500s

and 6 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 5.15
  • netapp active iq unified managerall versions
  • netapp bootstrap osall versions
  • netapp element softwareall versions
  • netapp h300s firmwareall versions
  • netapp h410c firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h700s firmwareall versions
  • netapp hci management nodeall versions
  • netapp solidfireall versions
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a kernel

    • Linux kernel 5.15-rc1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11linuxbefore 5.10.46-55.10.46-5
Debian:12linuxbefore 5.14.6-15.14.6-1
Debian:9linuxbefore 4.9.290-14.9.290-1
Debian:9linux-4.19before 4.19.208-1~deb9u14.19.208-1~deb9u1
openSUSE:Leap 15.2kernel-debugbefore 5.3.18-lp152.92.25.3.18-lp152.92.2
openSUSE:Leap 15.2kernel-defaultbefore 5.3.18-lp152.92.25.3.18-lp152.92.2
openSUSE:Leap 15.2kernel-default-basebefore 5.3.18-lp152.92.2.lp152.8.42.35.3.18-lp152.92.2.lp152.8.42.3
openSUSE:Leap 15.2kernel-docsbefore 5.3.18-lp152.92.15.3.18-lp152.92.1
openSUSE:Leap 15.2kernel-kvmsmallbefore 5.3.18-lp152.92.25.3.18-lp152.92.2
openSUSE:Leap 15.2kernel-obs-buildbefore 5.3.18-lp152.92.25.3.18-lp152.92.2
openSUSE:Leap 15.2kernel-obs-qabefore 5.3.18-lp152.92.15.3.18-lp152.92.1
openSUSE:Leap 15.2kernel-preemptbefore 5.3.18-lp152.92.25.3.18-lp152.92.2
openSUSE:Leap 15.2kernel-sourcebefore 5.3.18-lp152.92.25.3.18-lp152.92.2
openSUSE:Leap 15.2kernel-symsbefore 5.3.18-lp152.92.15.3.18-lp152.92.1
openSUSE:Leap 15.3dtb-aarch64before 5.3.18-59.24.15.3.18-59.24.1
openSUSE:Leap 15.3kernel-64kbbefore 5.3.18-59.24.15.3.18-59.24.1
openSUSE:Leap 15.3kernel-azurebefore 5.3.18-38.22.25.3.18-38.22.2
openSUSE:Leap 15.3kernel-debugbefore 5.3.18-59.24.15.3.18-59.24.1
openSUSE:Leap 15.3kernel-defaultbefore 5.3.18-59.24.15.3.18-59.24.1
openSUSE:Leap 15.3kernel-default-basebefore 5.3.18-59.24.1.18.12.15.3.18-59.24.1.18.12.1
openSUSE:Leap 15.3kernel-docsbefore 5.3.18-59.24.15.3.18-59.24.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 5.3.18-59.24.15.3.18-59.24.1
openSUSE:Leap 15.3kernel-obs-buildbefore 5.3.18-59.24.15.3.18-59.24.1
openSUSE:Leap 15.3kernel-obs-qabefore 5.3.18-59.24.15.3.18-59.24.1

+96

Same product

linux: all records

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  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux5.14.6-1 · Debian:12Package registry (OSV)
debian:linux-4.194.19.208-1~deb9u1 · Debian:9Package registry (OSV)
opensuse:kernel-azure5.3.18-38.22.2 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-debug5.3.18-lp152.92.2 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-default5.3.18-lp152.92.2 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-default-base5.3.18-lp152.92.2.lp152.8.42.3 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-docs5.3.18-lp152.92.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-kvmsmall5.3.18-lp152.92.2 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-build5.3.18-lp152.92.2 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-qa5.3.18-lp152.92.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-preempt5.3.18-lp152.92.2 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-source5.3.18-lp152.92.2 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-source-azure5.3.18-38.22.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-syms5.3.18-lp152.92.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:kernel-rt0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules-extra0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo-common-x86_640:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-devel0:4.18.0-553.rt7.342.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
rocky linux:kernel0:4.18.0-553.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:kernel-rt0:4.18.0-553.rt7.342.el8_10 · Rocky Linux:8Package registry (OSV)
suse:kernel-64kb5.3.18-59.24.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3Package registry (OSV)
suse:kernel-azure5.3.18-18.66.2 · SUSE:Linux Enterprise Module for Public Cloud 15 SP2Package registry (OSV)

+10

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records