CVE-2021-20321
A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the
02 Description
A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the
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
- 0.21% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 11.9% 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:N/I:N/A:H
- 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
- 2022-02-18 17:50Z4 YR AGO
- Last updated
- 2024-08-03 17:37Z2 YR AGO
- Reserved
- 2020-12-17
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class
- Data version
- 5.1
- Document digest
- 06336be0bfae4a546d5f534c3177925b4790f4493df1c2bfa20470958f791da7
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2013242
- lore.kernel.orghttps://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/
- lists.debian.org[debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- www.debian.orgDSA-5096https://www.debian.org/security/2022/dsa-5096
07 Fixed in
AlmaLinux 8
- kernel-tools-libs-devel Fixed in 4.18.0-348.7.1.el8_5
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 5.14.12.arch1-1
- linux-hardened Fixed in 5.14.13.hardened1-1
- linux-lts Fixed in 5.10.73-1
- linux-zen Fixed in 5.14.12.zen1-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- kernel-tools-libs-devel Fixed in 4.18.0-348.7.1.el8_5
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 5.14.12-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.14.12-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.14.12-1
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 4.15.0-166.174
- linux-aws Fixed in 4.15.0-1118.125
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-aws-5.4 Fixed in 5.4.0-1061.64~18.04.1
- linux-azure No fix yet
- linux-azure-4.15 Fixed in 4.15.0-1129.142
- linux-azure-5.3 No fix yet
- linux-azure-5.4 Fixed in 5.4.0-1065.68~18.04.1
- linux-azure-edge No fix yet
- linux-dell300x Fixed in 4.15.0-1033.38
- linux-gcp No fix yet
- linux-gcp-4.15 Fixed in 4.15.0-1114.128
- linux-gcp-5.3 No fix yet
- linux-gcp-5.4 Fixed in 5.4.0-1059.63~18.04.1
- linux-gke-4.15 No fix yet
- linux-gke-5.4 Fixed in 5.4.0-1057.60~18.04.1
- linux-gkeop-5.4 Fixed in 5.4.0-1029.30~18.04.2
- linux-hwe No fix yet
- linux-hwe-5.4 Fixed in 5.4.0-92.103~18.04.2
- linux-hwe-edge No fix yet
- linux-kvm Fixed in 4.15.0-1105.107
- linux-oem No fix yet
- linux-oracle Fixed in 4.15.0-1085.93
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
- linux-oracle-5.4 Fixed in 5.4.0-1059.63~18.04.1
- linux-raspi-5.4 Fixed in 5.4.0-1048.53~18.04.1
- linux-raspi2 Fixed in 4.15.0-1101.108
- linux-snapdragon Fixed in 4.15.0-1118.127
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 5.4.0-92.103
- linux-aws Fixed in 5.4.0-1061.64
- linux-aws-5.11 Fixed in 5.11.0-1023.24~20.04.1
- linux-aws-5.8 No fix yet
- linux-azure Fixed in 5.4.0-1065.68
- linux-azure-5.11 Fixed in 5.11.0-1023.24~20.04.1
- linux-azure-5.8 No fix yet
- linux-bluefield Fixed in 5.4.0-1023.26
- linux-gcp Fixed in 5.4.0-1059.63
- linux-gcp-5.11 Fixed in 5.11.0-1024.26~20.04.1
- linux-gcp-5.8 No fix yet
- linux-gke Fixed in 5.4.0-1057.60
- linux-gkeop Fixed in 5.4.0-1029.30
- linux-hwe-5.11 Fixed in 5.11.0-44.48~20.04.2
- linux-hwe-5.13 Fixed in 5.13.0-23.23~20.04.2
- linux-hwe-5.8 No fix yet
- linux-ibm Fixed in 5.4.0-1010.11
- linux-intel-5.13 No fix yet
- linux-kvm Fixed in 5.4.0-1051.53
- linux-oem-5.10 Fixed in 5.10.0-1051.53
- linux-oem-5.13 Fixed in 5.13.0-1026.32
- linux-oem-5.14 Fixed in 5.14.0-1007.7
- linux-oem-5.6 No fix yet
- linux-oracle Fixed in 5.4.0-1059.63
- linux-oracle-5.11 Fixed in 5.11.0-1023.24~20.04.1
- linux-oracle-5.8 No fix yet
- linux-raspi Fixed in 5.4.0-1048.53
- linux-raspi2 No fix yet
- linux-riscv No fix yet
- linux-riscv-5.11 Fixed in 5.11.0-1024.25~20.04.1
- 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 4.4.0-1120.126Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1129.142~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-lts-xenial Fixed in 4.4.0-242.276~14.04.1Available 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 4.4.0-242.276Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws Fixed in 4.4.0-1158.173Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws-hwe Fixed in 4.15.0-1118.125~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1129.142~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp Fixed in 4.15.0-1114.128~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe Fixed in 4.15.0-166.174~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-kvm Fixed in 4.4.0-1121.131Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle Fixed in 4.15.0-1085.93~16.04.1Available 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 4.4.0-1090.97Available 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 4.15.0-2059.61Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2041.45Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1075.84Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 4.15.0-2024.26Available 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+fips2Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.4.0-1073.76+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 5.4.0-1038.44Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.4.0-1067.71~20.04.1Available 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.