synced 2 MIN AGO
01 Record

CVE-2021-3753

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

UnratedPUBLISHEDCNA: redhat
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 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

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.36% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 29.9% of scored records. A rank, not a probability.
NVD base score
4.7 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-02-16 00:00Z4 YR AGO
Last updated
2024-08-03 17:09Z2 YR AGO
Reserved
2021-08-31
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-125Out-of-bounds ReadBase
  • CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class
Data version
5.1
Document digest
a73fe338ae5302900f461b72e4286c5e5adb9b185e631e177c6710ef8b174fa9

05 Affected products

VendorProductVersionsPlatforms
n/akernelLinux kernel 5.15-rc1—

06 References

07 Fixed in

AlmaLinux 8

  • bpftool
    Fixed in 4.18.0-553.el8_10
  • kernel
    Fixed in 4.18.0-553.el8_10
  • kernel-abi-stablelists
    Fixed in 4.18.0-553.el8_10
  • kernel-core
    Fixed in 4.18.0-553.el8_10
  • kernel-cross-headers
    Fixed in 4.18.0-553.el8_10
  • kernel-debug
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-core
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-modules
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-modules-extra
    Fixed in 4.18.0-553.el8_10
  • kernel-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-doc
    Fixed in 4.18.0-553.el8_10
  • kernel-headers
    Fixed in 4.18.0-553.el8_10
  • kernel-modules
    Fixed in 4.18.0-553.el8_10
  • kernel-modules-extra
    Fixed in 4.18.0-553.el8_10
  • kernel-rt
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-core
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-core
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-devel
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-kvm
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-modules
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-modules-extra
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-devel
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-kvm
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-modules
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-modules-extra
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-tools
    Fixed in 4.18.0-553.el8_10
  • kernel-tools-libs
    Fixed in 4.18.0-553.el8_10
  • kernel-tools-libs-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-core
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-modules
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-modules-extra
    Fixed in 4.18.0-553.el8_10
  • perf
    Fixed in 4.18.0-553.el8_10
  • python3-perf
    Fixed in 4.18.0-553.el8_10

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • linux
    Fixed in 5.14.2.arch1-2
  • linux-hardened
    Fixed in 5.13.14.hardened1-1
  • linux-lts
    Fixed in 5.10.62-1
  • linux-zen
    Fixed in 5.14.2.zen1-2

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • bpftool
    Fixed in 4.18.0-553.el8_10
  • kernel
    Fixed in 4.18.0-553.el8_10
  • kernel-abi-stablelists
    Fixed in 4.18.0-553.el8_10
  • kernel-core
    Fixed in 4.18.0-553.el8_10
  • kernel-cross-headers
    Fixed in 4.18.0-553.el8_10
  • kernel-debug
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-core
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-modules
    Fixed in 4.18.0-553.el8_10
  • kernel-debug-modules-extra
    Fixed in 4.18.0-553.el8_10
  • kernel-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-doc
    Fixed in 4.18.0-553.el8_10
  • kernel-headers
    Fixed in 4.18.0-553.el8_10
  • kernel-modules
    Fixed in 4.18.0-553.el8_10
  • kernel-modules-extra
    Fixed in 4.18.0-553.el8_10
  • kernel-rt
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-core
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-core
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-devel
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-kvm
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-modules
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-debug-modules-extra
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-devel
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-kvm
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-modules
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-rt-modules-extra
    Fixed in 4.18.0-553.rt7.342.el8_10
  • kernel-tools
    Fixed in 4.18.0-553.el8_10
  • kernel-tools-libs
    Fixed in 4.18.0-553.el8_10
  • kernel-tools-libs-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-core
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-devel
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-modules
    Fixed in 4.18.0-553.el8_10
  • kernel-zfcpdump-modules-extra
    Fixed in 4.18.0-553.el8_10
  • perf
    Fixed in 4.18.0-553.el8_10
  • python3-perf
    Fixed in 4.18.0-553.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • linux
    Fixed in 5.14.6-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • linux
    Fixed in 5.14.6-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • linux
    Fixed in 5.14.6-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • linux-hwe-edge
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • linux
    Fixed in 4.15.0-162.170
  • linux-aws
    Fixed in 4.15.0-1115.122
  • linux-aws-5.0
    No fix yet
  • linux-aws-5.3
    No fix yet
  • linux-aws-5.4
    Fixed in 5.4.0-1059.62~18.04.1
  • linux-azure
    No fix yet
  • linux-azure-4.15
    Fixed in 4.15.0-1126.139
  • linux-azure-5.3
    No fix yet
  • linux-azure-5.4
    Fixed in 5.4.0-1063.66~18.04.1
  • linux-azure-edge
    No fix yet
  • linux-dell300x
    Fixed in 4.15.0-1030.35
  • linux-gcp
    No fix yet
  • linux-gcp-4.15
    Fixed in 4.15.0-1111.125
  • linux-gcp-5.3
    No fix yet
  • linux-gcp-5.4
    Fixed in 5.4.0-1057.61~18.04.1
  • linux-gcp-edge
    No fix yet
  • linux-gke-4.15
    No fix yet
  • linux-gke-5.4
    Fixed in 5.4.0-1055.58~18.04.1
  • linux-gkeop-5.4
    Fixed in 5.4.0-1026.27~18.04.1
  • linux-hwe
    No fix yet
  • linux-hwe-5.4
    Fixed in 5.4.0-90.101~18.04.1
  • linux-hwe-edge
    No fix yet
  • linux-kvm
    Fixed in 4.15.0-1102.104
  • linux-oem
    No fix yet
  • linux-oracle
    Fixed in 4.15.0-1083.91
  • linux-oracle-5.0
    No fix yet
  • linux-oracle-5.3
    No fix yet
  • linux-oracle-5.4
    Fixed in 5.4.0-1057.61~18.04.1
  • linux-raspi-5.4
    Fixed in 5.4.0-1046.50~18.04.1
  • linux-raspi2
    Fixed in 4.15.0-1098.104
  • linux-snapdragon
    Fixed in 4.15.0-1115.124

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • linux
    Fixed in 5.4.0-90.101
  • linux-aws
    Fixed in 5.4.0-1059.62
  • linux-aws-5.11
    Fixed in 5.11.0-1020.21~20.04.2
  • linux-aws-5.8
    No fix yet
  • linux-azure
    Fixed in 5.4.0-1063.66
  • linux-azure-5.11
    Fixed in 5.11.0-1020.21~20.04.1
  • linux-azure-5.8
    No fix yet
  • linux-bluefield
    Fixed in 5.4.0-1021.24
  • linux-gcp
    Fixed in 5.4.0-1057.61
  • linux-gcp-5.11
    Fixed in 5.11.0-1021.23~20.04.1
  • linux-gcp-5.8
    No fix yet
  • linux-gke
    Fixed in 5.4.0-1055.58
  • linux-gkeop
    Fixed in 5.4.0-1026.27
  • linux-hwe-5.11
    Fixed in 5.11.0-38.42~20.04.1
  • linux-hwe-5.8
    No fix yet
  • linux-ibm
    Fixed in 5.4.0-1007.8
  • linux-intel-5.13
    No fix yet
  • linux-kvm
    Fixed in 5.4.0-1049.51
  • linux-oem-5.10
    Fixed in 5.10.0-1050.52
  • linux-oem-5.13
    Fixed in 5.13.0-1017.21
  • linux-oem-5.6
    No fix yet
  • linux-oracle
    Fixed in 5.4.0-1057.61
  • linux-oracle-5.11
    Fixed in 5.11.0-1020.21~20.04.1
  • linux-oracle-5.8
    No fix yet
  • linux-raspi
    Fixed in 5.4.0-1046.50
  • linux-raspi2
    No fix yet
  • linux-riscv
    No fix yet
  • linux-riscv-5.11
    Fixed in 5.11.0-1021.22~20.04.1
  • linux-riscv-5.8
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • linux-intel-iot-realtime
    No fix yet
  • linux-realtime
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • linux-raspi-realtime
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • linux
    No fix yet
  • linux-aws
    Fixed in 4.4.0-1120.126
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-azure
    Fixed in 4.15.0-1126.139~14.04.1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-lts-xenial
    Fixed in 4.4.0-242.276~14.04.1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • linux
    Fixed in 4.4.0-242.276
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-aws
    Fixed in 4.4.0-1158.173
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-aws-hwe
    Fixed in 4.15.0-1115.122~16.04.1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-azure
    Fixed in 4.15.0-1126.139~16.04.1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-gcp
    Fixed in 4.15.0-1111.125~16.04.1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-hwe
    Fixed in 4.15.0-162.170~16.04.1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-kvm
    Fixed in 4.4.0-1121.131
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • linux-oracle
    Fixed in 4.15.0-1083.91~16.04.1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 16.04 LTS

  • linux-fips
    Fixed in 4.4.0-1090.97
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 18.04 LTS

  • linux-aws-fips
    Fixed in 4.15.0-2056.58
    Available with Ubuntu Pro: https://ubuntu.com/pro
  • linux-azure-fips
    Fixed in 4.15.0-2038.42
    Available with Ubuntu Pro: https://ubuntu.com/pro
  • linux-fips
    Fixed in 4.15.0-1072.81
    Available with Ubuntu Pro: https://ubuntu.com/pro
  • linux-gcp-fips
    Fixed in 4.15.0-2021.23
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 20.04 LTS

  • linux-aws-fips
    Fixed in 5.4.0-1069.73+fips2
    Available with Ubuntu Pro: https://ubuntu.com/pro
  • linux-azure-fips
    Fixed in 5.4.0-1073.76+fips1
    Available with Ubuntu Pro: https://ubuntu.com/pro
  • linux-fips
    Fixed in 5.4.0-1036.42
    Available with Ubuntu Pro: https://ubuntu.com/pro
  • linux-gcp-fips
    Fixed in 5.4.0-1067.71~20.04.1
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS 16.04 LTS

  • linux-fips
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS 18.04 LTS

  • linux-aws-fips
    No fix yet
  • linux-azure-fips
    No fix yet
  • linux-fips
    No fix yet
  • linux-gcp-fips
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS 20.04 LTS

  • linux-aws-fips
    No fix yet
  • linux-azure-fips
    No fix yet
  • linux-fips
    No fix yet
  • linux-gcp-fips
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.