Input validation error in Linux kernel - CVE-2021-47293

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU94124

Input validation error in Linux kernel - CVE-2021-47293

Published: July 11, 2024 / Updated: May 13, 2025


Vulnerability identifier: #VU94124
CSH Severity: Low
CVSS v4 BT: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-47293
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the tcf_skbmod_act() function in net/sched/act_skbmod.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Software Development Kit 12
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kgraft-patch-4_12_14-122_222-default
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
kernel-rt_debug-debugsource
kernel-rt_debug-debuginfo
kernel-rt-base
kernel-rt-debugsource
dlm-kmp-rt
kernel-rt-devel
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-devel-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-base-debuginfo
kernel-rt_debug-devel
cluster-md-kmp-rt
kernel-source-rt
kernel-devel-rt
kernel-rt_debug
kernel-rt
kernel-azure-base
kernel-source-azure
kernel-devel-azure
kernel-azure-debugsource
kernel-syms-azure
kernel-azure-base-debuginfo
kernel-azure-devel
kernel-azure-debuginfo
kernel-azure
kernel-default
kernel-default-extra-debuginfo
kernel-devel
kernel-source
kernel-macros
kernel-default-devel-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-docs
kernel-obs-build-debugsource
kernel-obs-build
kernel-default-man
kernel-default-extra
kernel-default-base
ocfs2-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
kernel-default-devel
kernel-syms
ocfs2-kmp-default-debuginfo
kernel-default-debuginfo
cluster-md-kmp-default
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
dlm-kmp-default
kernel-default-debugsource
gfs2-kmp-default-debuginfo
kernel (Red Hat package)

How to mitigate CVE-2021-47293

Install update from vendor's website.

Linux kernel - addressed in versions 4.19.199, 5.4.136, 5.10.54, 5.13.6, 5.14
kgraft-patch-4_12_14-122_222-default - update to 1-8.3.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.191.1
gfs2-kmp-rt - update to 4.12.14-10.191.1
kernel-rt_debug-debugsource - update to 4.12.14-10.191.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.191.1
kernel-rt-base - update to 4.12.14-10.191.1
kernel-rt-debugsource - update to 4.12.14-10.191.1
dlm-kmp-rt - update to 4.12.14-10.191.1
kernel-rt-devel - update to 4.12.14-10.191.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.191.1
ocfs2-kmp-rt - update to 4.12.14-10.191.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.191.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.191.1
kernel-syms-rt - update to 4.12.14-10.191.1
kernel-rt-debuginfo - update to 4.12.14-10.191.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.191.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.191.1
kernel-rt-base-debuginfo - update to 4.12.14-10.191.1
kernel-rt_debug-devel - update to 4.12.14-10.191.1
cluster-md-kmp-rt - update to 4.12.14-10.191.1
kernel-source-rt - update to 4.12.14-10.191.1
kernel-devel-rt - update to 4.12.14-10.191.1
kernel-rt_debug - update to 4.12.14-10.191.1
kernel-rt - update to 4.12.14-10.191.1
kernel-azure-base - update to 4.12.14-16.191.1
kernel-source-azure - update to 4.12.14-16.191.1
kernel-devel-azure - update to 4.12.14-16.191.1
kernel-azure-debugsource - update to 4.12.14-16.191.1
kernel-syms-azure - update to 4.12.14-16.191.1
kernel-azure-base-debuginfo - update to 4.12.14-16.191.1
kernel-azure-devel - update to 4.12.14-16.191.1
kernel-azure-debuginfo - update to 4.12.14-16.191.1
kernel-azure - update to 4.12.14-16.191.1
kernel-default - update to 4.12.14-122.222.1
kernel-default-extra-debuginfo - update to 4.12.14-122.222.1
kernel-devel - update to 4.12.14-122.222.1
kernel-source - update to 4.12.14-122.222.1
kernel-macros - update to 4.12.14-122.222.1
kernel-default-devel-debuginfo - update to 4.12.14-122.222.1
kernel-default-kgraft-devel - update to 4.12.14-122.222.1
kernel-default-kgraft - update to 4.12.14-122.222.1
kernel-docs - update to 4.12.14-122.222.1
kernel-obs-build-debugsource - update to 4.12.14-122.222.1
kernel-obs-build - update to 4.12.14-122.222.1
kernel-default-man - update to 4.12.14-122.222.1
kernel-default-extra - update to 4.12.14-122.222.1
kernel-default-base - update to 4.12.14-122.222.1
ocfs2-kmp-default - update to 4.12.14-122.222.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.222.1
gfs2-kmp-default - update to 4.12.14-122.222.1
kernel-default-devel - update to 4.12.14-122.222.1
kernel-syms - update to 4.12.14-122.222.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.222.1
kernel-default-debuginfo - update to 4.12.14-122.222.1
cluster-md-kmp-default - update to 4.12.14-122.222.1
kernel-default-base-debuginfo - update to 4.12.14-122.222.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.222.1
dlm-kmp-default - update to 4.12.14-122.222.1
kernel-default-debugsource - update to 4.12.14-122.222.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.222.1
kernel (Red Hat package) - update to 4.18.0-372.111.1.el8_6

External References

Related Security Bulletins