CVE-2021-20321

Published on: Not Yet Published

Last Modified on: 05/11/2022 02:20:00 PM UTC

CVE-2021-20321

Source: Mitre Source: NIST CVE.ORG Print: PDF PDF
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Certain versions of Debian Linux from Debian contain the following vulnerability:

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.

  • CVE-2021-20321 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.

CVSS3 Score: 4.7 - MEDIUM

Attack
Vector ⓘ		 Attack
Complexity		 Privileges
Required		 User
Interaction
LOCAL HIGH LOW NONE
Scope Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
UNCHANGED NONE NONE HIGH

CVSS2 Score: 4.7 - MEDIUM

Access
Vector ⓘ		 Access
Complexity		 Authentication
LOCAL MEDIUM NONE
Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
NONE NONE COMPLETE

CVE References

Description Tags ⓘ Link
2013242 – (CVE-2021-20321) CVE-2021-20321 kernel: In Overlayfs missing a check for a negative dentry before calling vfs_rename() bugzilla.redhat.com
text/html
 URL Logo MISC bugzilla.redhat.com/show_bug.cgi?id=2013242
[SECURITY] [DLA 2941-1] linux-4.19 security update lists.debian.org
text/html
 URL Logo MLIST [debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update
Debian -- Security Information -- DSA-5096-1 linux www.debian.org
Depreciated Link
text/html
 URL Logo DEBIAN DSA-5096
[PATCH 5.10 11/83] ovl: fix missing negative dentry check in ovl_rename() - Greg Kroah-Hartman lore.kernel.org
text/x-diff
 URL Logo MISC lore.kernel.org/all/[email protected]/
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Related QID Numbers

  • 159575 Oracle Enterprise Linux Security Update for kernel (ELSA-2021-5227)
  • 159621 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2022-9088)
  • 178943 Debian Security Update for linux (DLA 2843-1)
  • 179117 Debian Security Update for linux (DSA 5096-1)
  • 179119 Debian Security Update for linux-4.19 (DLA 2941-1)
  • 179506 Debian Security Update for linux (CVE-2021-20321)
  • 198617 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5209-1)
  • 198618 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5210-1)
  • 198621 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5208-1)
  • 198627 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5218-1)
  • 239974 Red Hat Update for kernel (RHSA-2021:5227)
  • 239979 Red Hat Update for kernel-rt (RHSA-2021:5241)
  • 352869 Amazon Linux Security Advisory for kernel: ALAS2-2021-1719
  • 353153 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.10-2022-007
  • 353242 Amazon Linux Security Advisory for kernel : ALAC2012-2022-036
  • 353243 Amazon Linux Security Advisory for kmod-mlx5 : ALAC2012-2022-037
  • 353244 Amazon Linux Security Advisory for kmod-sfc : ALAC2012-2022-038
  • 353989 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-027
  • 354000 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-029
  • 354013 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-031
  • 390256 Oracle Managed Virtualization (VM) Server for x86 Security Update for kernel (OVMSA-2022-0007)
  • 610418 Google Pixel Android June 2022 Security Patch Missing
  • 610422 Google Android July 2022 Security Patch Missing for Huawei EMUI
  • 671219 EulerOS Security Update for kernel (EulerOS-SA-2022-1030)
  • 671288 EulerOS Security Update for kernel (EulerOS-SA-2022-1227)
  • 671367 EulerOS Security Update for kernel (EulerOS-SA-2022-1308)
  • 671401 EulerOS Security Update for kernel (EulerOS-SA-2022-1328)
  • 671436 EulerOS Security Update for kernel (EulerOS-SA-2022-1352)
  • 671498 EulerOS Security Update for kernel (EulerOS-SA-2022-1466)
  • 671703 EulerOS Security Update for kernel (EulerOS-SA-2022-1735)
  • 752120 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1651-1)
  • 752125 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1686-1)
  • 752126 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1687-1)
  • 752231 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2082-1)
  • 752237 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2083-1)
  • 752240 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2103-1)
  • 752242 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2104-1)
  • 752250 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2111-1)
  • 753176 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1676-1)
  • 753299 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1669-1)
  • 900722 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8798)
  • 905850 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8798-1)
  • 940083 AlmaLinux Security Update for kernel (ALSA-2021:5227)
  • 960779 Rocky Linux Security Update for kernel-rt (RLSA-2021:5241)
  • 960807 Rocky Linux Security Update for kernel (RLSA-2021:5227)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System		DebianDebian Linux10.0AllAllAll
Operating
System		DebianDebian Linux9.0AllAllAll
Operating
System		LinuxLinux KernelAllAllAllAll
Operating
System		LinuxLinux Kernel5.15-AllAll
Operating
System		LinuxLinux Kernel5.15rc1AllAll
Operating
System		LinuxLinux Kernel5.15rc2AllAll
Operating
System		LinuxLinux Kernel5.15rc3AllAll
Operating
System		LinuxLinux Kernel5.15rc4AllAll
Operating
System		RedhatEnterprise Linux7.0AllAllAll
Operating
System		RedhatEnterprise Linux8.0AllAllAll
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*:
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*:
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*:
  • 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:*:*:*:*:*:*:
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*:
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @softek_jp Linux Kernel の OverlayFS の処理にサービスを妨害される問題 (CVE-2021-20321) [40416] sid.softek.jp/content/show/4… #SIDfm #脆弱性情報 2021-11-05 06:31:10
Twitter Icon @management_sun IT Risk: Ubuntu.Linux kernelに複数の脆弱性 -2/2 CVE-2021-43267 CVE-2021-43056 CVE-2021-41864 CVE-2021-20321 CVE-2021-20317… twitter.com/i/web/status/1… 2022-01-07 04:05:11
Twitter Icon @management_sun IT Risk: Red Hat.OpenShift Enterprise Loggingに複数の脆弱性 -2/2 CVE-2021-42574 CVE-2021-20321 CVE-2021-3712 2022-01-11 09:11:23
Twitter Icon @management_sun IT Risk: Ubuntu.Linux Kernel (OEM)に複数の脆弱性 -2/2 CVE-2021-20321 CVE-2021-4204 CVE-2021-4002 CVE-2021-3760 2022-01-12 08:30:58
Twitter Icon @management_sun IT Risk: Ubuntu.Multiple vulnerabilities in the Linux Kernel (OEM) -2/2 CVE-2021-20321 CVE-2021-4204 CVE-2021-4002 CVE-2021-3760 2022-01-12 08:31:28
Twitter Icon @CVEreport CVE-2021-20321 : A race condition accessing file object in the #Linux #kernel OverlayFS subsystem was found in the… twitter.com/i/web/status/1… 2022-03-01 00:34:37
Reddit Logo Icon /r/synology DSM Version: 7.1.1-42951 (Release Candidate) 2022-08-10 06:07:14
Reddit Logo Icon /r/synology Has anyone seen the release notes for the latest DSM 7.1.1 Release Candidate. Fixes a scary amount of CVEs. 2022-08-16 14:26:29
Reddit Logo Icon /r/synology DSM 7.1.1-42962 released! 2022-09-05 11:39:36
Reddit Logo Icon /r/asustor ADM 4.1.0.RLQ1 update available (2022-09-28) 2022-10-08 04:00:04
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