Medium severity4.7NVD Advisory· Published Feb 18, 2022· Updated Jun 17, 2026

CVE-2021-20321

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 system.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

258

Linux/Kernelllm-fuzzy7 versions
(expand)+ 6 more
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: <5.15
- cpe:2.3:o:linux:linux_kernel:5.15:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
Linux/Linux kernel OverlayFSdescription
osv-coords246 versions
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pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCL pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1 pkg:rpm/suse/kernel-docs&distro=SUSE%20Enterprise%20Storage%206 pkg:rpm/suse/kernel-source&distro=SUSE%20Enterprise%20Storage%206 pkg:rpm/opensuse/kernel-vanilla&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.4 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOS pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-LTSS pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-LTSS pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSS pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSS pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSS pkg:rpm/suse/release-notes-sle_rt&distro=SUSE%20Real%20Time%20Module%2015%20SP3 pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_45&distro=HPE%20Helion%20OpenStack%208 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSS pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-ESPOS pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-BCL pkg:rpm/suse/kernel-preempt&distro=SUSE%20Enterprise%20Storage%207 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSS pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSS pkg:rpm/suse/kernel-default-base&distro=SUSE%20Manager%20Proxy%204.1 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP2 pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP3 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Enterprise%20Storage%206 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSS pkg:rpm/suse/kernel-default-base&distro=SUSE%20Enterprise%20Storage%207 pkg:rpm/suse/kernel-syms&distro=HPE%20Helion%20OpenStack%208 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSS pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSS pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-BCL pkg:rpm/suse/kernel-default&distro=SUSE%20Manager%20Proxy%204.1 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Manager%20Server%204.1
< 4.18.0-348.7.1.el8_5+ 245 more
- (no CPE)range: < 4.18.0-348.7.1.el8_5
- (no CPE)range: < 4.12.14-16.97.1
- (no CPE)range: < 4.12.14-16.97.1
- (no CPE)range: < 4.12.14-16.97.1
- (no CPE)range: < 4.12.14-10.89.1
- (no CPE)range: < 4.12.14-10.89.1
- (no CPE)range: < 5.3.18-150300.88.1
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.4.121-92.175.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.4.180-94.164.3
- (no CPE)range: < 1-4.3.2
- (no CPE)range: < 4.4.180-94.164.3
- (no CPE)range: < 4.4.180-94.164.3
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 4.12.14-95.99.3
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150300.88.2
- (no CPE)range: < 5.3.18-150300.88.2
- (no CPE)range: < 15.3.20220422-150300.3.3.2
- (no CPE)range: < 5.3.18-150300.88.2
- (no CPE)range: < 5.3.18-150300.88.2
- (no CPE)range: < 4.12.14-16.97.1
- (no CPE)range: < 5.3.18-150300.38.56.1
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 1-8.5.2
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 4.12.14-122.121.1
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1.150300.18.41.3
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 1-150300.7.5.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1.150300.18.41.3
- (no CPE)range: < 5.3.18-150300.59.68.1.150300.18.41.3
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 4.4.121-92.175.2
- (no CPE)range: < 4.4.121-92.175.2
- (no CPE)range: < 4.4.180-94.164.3
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.4.180-94.164.3
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 1-4.3.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.4.180-94.164.3
- (no CPE)range: < 4.4.180-94.164.3
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 1-4.3.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 1-4.3.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.12.14-95.99.3
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 4.12.14-95.99.3
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 4.12.14-95.99.3
- (no CPE)range: < 4.12.14-95.99.3
- (no CPE)range: < 1-6.3.3
- (no CPE)range: < 4.12.14-95.99.3
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 1-150000.1.3.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 1-150200.5.3.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 1-150100.3.3.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 4.12.14-16.97.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 4.12.14-10.89.1
- (no CPE)range: < 4.12.14-10.89.1
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 4.12.14-122.121.2
- (no CPE)range: < 5.3.18-150300.38.56.1
- (no CPE)range: < 5.3.18-150300.38.56.1
- (no CPE)range: < 5.3.18-150300.38.56.1
- (no CPE)range: < 5.3.18-150300.38.56.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 15.3.20220422-150300.3.3.2
- (no CPE)range: < 1-4.3.2
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 4.12.14-16.97.1
- (no CPE)range: < 5.3.18-150300.59.68.1
- (no CPE)range: < 5.3.18-150300.59.68.1.150300.18.41.3
- (no CPE)range: < 5.3.18-150300.88.2
- (no CPE)range: < 4.12.14-150100.197.114.2
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 4.12.14-95.99.2
- (no CPE)range: < 5.3.18-150200.24.115.1.150200.9.54.1
- (no CPE)range: < 4.4.180-94.164.2
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 5.3.18-150300.38.56.1
- (no CPE)range: < 4.12.14-150000.150.92.2
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
- (no CPE)range: < 5.3.18-150200.24.115.1
Red Hat/Enterprise Linux Server2 versions
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlnvdMailing ListThird Party Advisory
www.debian.org/security/2022/dsa-5096nvdThird Party Advisory
lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/nvd

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cvss	0.306
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000