Memory leak in Linux kernel - CVE-2021-47295

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Main Vulnerability Database Vulnerabilities #VU89955

Memory leak in Linux kernel - CVE-2021-47295

Published: May 30, 2024 / Updated: May 14, 2025


Vulnerability identifier: #VU89955
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-47295
CWE-ID: CWE-401
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 memory leak within the tcindex_filter_result_init() and tcindex_partial_destroy_work() functions in net/sched/cls_tcindex.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
RecoverPoint for Virtual Machines
kgraft-patch-4_12_14-122_225-default
gfs2-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt_debug
kernel-rt
kernel-devel-rt
kernel-source-rt
ocfs2-kmp-rt
kernel-syms-rt
gfs2-kmp-rt
kernel-rt_debug-debuginfo
kernel-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
cluster-md-kmp-rt
kernel-rt_debug-debugsource
dlm-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt_debug-devel
ocfs2-kmp-rt-debuginfo
kernel-rt-debugsource
kernel-rt_debug-devel-debuginfo
kernel-rt-devel
kernel-source-azure
kernel-devel-azure
kernel-azure-debuginfo
kernel-syms-azure
kernel-azure-base
kernel-azure-base-debuginfo
kernel-azure
kernel-azure-debugsource
kernel-azure-devel
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-macros
kernel-devel
kernel-source
kernel-default
gfs2-kmp-default-debuginfo
kernel-syms
kernel-default-base
cluster-md-kmp-default
ocfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-debugsource
dlm-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-base-debuginfo
gfs2-kmp-default
kernel-default-devel
kernel-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-docs
Dell Secure Connect Gateway

How to mitigate CVE-2021-47295

Install update from vendor's website.

Linux kernel - addressed in versions 5.4.136, 5.10.54, 5.13.6, 5.14
RecoverPoint for Virtual Machines - update to 6.0 SP2 P1
kgraft-patch-4_12_14-122_225-default - update to 1-8.3.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.197.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.197.1
kernel-rt_debug - update to 4.12.14-10.197.1
kernel-rt - update to 4.12.14-10.197.1
kernel-devel-rt - update to 4.12.14-10.197.1
kernel-source-rt - update to 4.12.14-10.197.1
ocfs2-kmp-rt - update to 4.12.14-10.197.1
kernel-syms-rt - update to 4.12.14-10.197.1
gfs2-kmp-rt - update to 4.12.14-10.197.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.197.1
kernel-rt-debuginfo - update to 4.12.14-10.197.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.197.1
kernel-rt-base-debuginfo - update to 4.12.14-10.197.1
kernel-rt-base - update to 4.12.14-10.197.1
cluster-md-kmp-rt - update to 4.12.14-10.197.1
kernel-rt_debug-debugsource - update to 4.12.14-10.197.1
dlm-kmp-rt - update to 4.12.14-10.197.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.197.1
kernel-rt_debug-devel - update to 4.12.14-10.197.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.197.1
kernel-rt-debugsource - update to 4.12.14-10.197.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.197.1
kernel-rt-devel - update to 4.12.14-10.197.1
kernel-source-azure - update to 4.12.14-16.194.1
kernel-devel-azure - update to 4.12.14-16.194.1
kernel-azure-debuginfo - update to 4.12.14-16.194.1
kernel-syms-azure - update to 4.12.14-16.194.1
kernel-azure-base - update to 4.12.14-16.194.1
kernel-azure-base-debuginfo - update to 4.12.14-16.194.1
kernel-azure - update to 4.12.14-16.194.1
kernel-azure-debugsource - update to 4.12.14-16.194.1
kernel-azure-devel - update to 4.12.14-16.194.1
kernel-default-extra-debuginfo - update to 4.12.14-122.225.1
kernel-default-extra - update to 4.12.14-122.225.1
kernel-default-man - update to 4.12.14-122.225.1
kernel-obs-build - update to 4.12.14-122.225.1
kernel-obs-build-debugsource - update to 4.12.14-122.225.1
kernel-default-kgraft - update to 4.12.14-122.225.1
kernel-default-kgraft-devel - update to 4.12.14-122.225.1
kernel-default-devel-debuginfo - update to 4.12.14-122.225.1
kernel-macros - update to 4.12.14-122.225.1
kernel-devel - update to 4.12.14-122.225.1
kernel-source - update to 4.12.14-122.225.1
kernel-default - update to 4.12.14-122.225.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.225.1
kernel-syms - update to 4.12.14-122.225.1
kernel-default-base - update to 4.12.14-122.225.1
cluster-md-kmp-default - update to 4.12.14-122.225.1
ocfs2-kmp-default - update to 4.12.14-122.225.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.225.1
kernel-default-debugsource - update to 4.12.14-122.225.1
dlm-kmp-default - update to 4.12.14-122.225.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.225.1
kernel-default-base-debuginfo - update to 4.12.14-122.225.1
gfs2-kmp-default - update to 4.12.14-122.225.1
kernel-default-devel - update to 4.12.14-122.225.1
kernel-default-debuginfo - update to 4.12.14-122.225.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.225.1
kernel-docs - update to 4.12.14-122.225.2
Dell Secure Connect Gateway - update to 5.26.00.18

External References

Related Security Bulletins