Vulnerability Name:

CVE-2021-20321 (CCN-212885)

Assigned:2020-12-17
Published:2021-10-11
Updated:2022-05-11
Summary: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.
CVSS v3 Severity:4.7 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.1 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
5.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
5.5 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.8 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.7 Medium (CVSS v2 Vector: AV:L/AC:M/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-362
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-20321

Source: CCN
Type: The Linux Kernel Archives Web site
The Linux Kernel Archives

Source: CCN
Type: Red Hat Bugzilla – Bug 2013242
(CVE-2021-20321) - CVE-2021-20321 kernel: In Overlayfs missing a check for a negative dentry before calling vfs_rename()

Source: MISC
Type: Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2013242

Source: XF
Type: UNKNOWN
linux-kernel-cve202120321-dos(212885)

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update

Source: MISC
Type: Patch, Vendor Advisory
https://lore.kernel.org/all/20211011134508.748956131@linuxfoundation.org/

Source: DEBIAN
Type: Third Party Advisory
DSA-5096

Source: CCN
Type: IBM Security Bulletin 6596971 (Spectrum Protect Plus)
Multiple vulnerabilities in Linux Kernel affect IBM Spectrum Protect Plus

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:5.15:-:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version < 5.15)

    • Configuration 2:
  • cpe:/o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration RedHat 1:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/a:redhat:enterprise_linux:8::crb:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:8::baseos:*:*:*:*:*

    • Configuration RedHat 5:
  • cpe:/a:redhat:enterprise_linux:8::nfv:*:*:*:*:*

    • Configuration RedHat 6:
  • cpe:/a:redhat:enterprise_linux:8::realtime:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:-:*:*:*:*:*:*:*
  • AND
  • cpe:/a:ibm:spectrum_protect_plus:10.1.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:8029
    P
    		kernel-docs-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-20
    oval:org.opensuse.security:def:7539
    P
    		kernel-64kb-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:8090
    P
    		reiserfs-kmp-default-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:3453
    P
    		clamav-0.101.3-1.19 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3567
    P
    		libXtst6-1.2.2-7.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3398
    P
    		wpa_supplicant-2.6-15.10.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3448
    P
    		busybox-1.21.1-3.3 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:95028
    P
    		kernel-docs-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:2960
    P
    		kernel-64kb-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95078
    P
    		reiserfs-kmp-default-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95083
    P
    		kernel-azure-5.14.21-150400.12.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94590
    P
    		kernel-64kb-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95197
    P
    		kernel-default-extra-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:531
    P
    		Security update for the Linux Kernel (Important)
    2022-06-17
    oval:org.opensuse.security:def:118189
    P
    		Security update for the Linux Kernel (Important)
    2022-06-16
    oval:org.opensuse.security:def:119232
    P
    		Security update for the Linux Kernel (Important)
    2022-06-16
    oval:org.opensuse.security:def:118647
    P
    		Security update for the Linux Kernel (Important)
    2022-06-16
    oval:org.opensuse.security:def:119422
    P
    		Security update for the Linux Kernel (Important)
    2022-06-16
    oval:org.opensuse.security:def:118737
    P
    		Security update for the Linux Kernel (Important)
    2022-06-16
    oval:org.opensuse.security:def:119607
    P
    		Security update for the Linux Kernel (Important)
    2022-06-16
    oval:org.opensuse.security:def:118927
    P
    		Security update for the Linux Kernel (Important)
    2022-06-16
    oval:org.opensuse.security:def:125112
    P
    		Security update for the Linux Kernel (Important)
    2022-06-14
    oval:org.opensuse.security:def:127295
    P
    		Security update for the Linux Kernel (Important)
    2022-06-14
    oval:org.opensuse.security:def:125369
    P
    		Security update for the Linux Kernel (Important)
    2022-06-14
    oval:org.opensuse.security:def:125732
    P
    		Security update for the Linux Kernel (Important)
    2022-06-14
    oval:org.opensuse.security:def:126898
    P
    		Security update for the Linux Kernel (Important)
    2022-06-14
    oval:org.opensuse.security:def:1596
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:4295
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:42381
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:1234
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:1750
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:4604
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:42383
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:481
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:1350
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:6039
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:42282
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:1760
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:890
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:4734
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:1559
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:6331
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:42284
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:1803
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:1168
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:5241
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:6034
    P
    		Security update for the Linux Kernel (Important)
    2022-05-12
    oval:com.redhat.rhsa:def:20215227
    P
    		RHSA-2021:5227: kernel security and bug fix update (Moderate)
    2021-12-21
    oval:com.redhat.rhsa:def:20215241
    P
    		RHSA-2021:5241: kernel-rt security and bug fix update (Moderate)
    2021-12-21
    BACK
    linux linux kernel 5.15 rc2
    linux linux kernel 5.15 rc3
    linux linux kernel 5.15 -
    linux linux kernel 5.15 rc1
    linux linux kernel 5.15 rc4
    linux linux kernel *
    redhat enterprise linux 7.0
    redhat enterprise linux 8.0
    debian debian linux 9.0
    debian debian linux 10.0
    linux linux kernel -
    ibm spectrum protect plus 10.1.0