Memory leak in Linux kernel - CVE-2021-47304

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Main Vulnerability Database Vulnerabilities #VU89957

Memory leak in Linux kernel - CVE-2021-47304

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


Vulnerability identifier: #VU89957
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-2021-47304
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 tcp_init_transfer() function in net/ipv4/tcp_input.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Technical Support Appliance
Robotic Process Automation for Cloud Pak
Juniper Secure Analytics (JSA)
Red Hat OpenShift Container Platform
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-devel
kernel-debug-devel
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
kernel-abi-stablelists
kernel-doc
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-core
kernel-debug
kernel-cross-headers
kernel-core
kernel
bpftool
Session Smart Router
IBM Qradar SIEM

How to mitigate CVE-2021-47304

Install update from vendor's website.

Linux kernel - addressed in versions 5.10.53, 5.13.5, 5.14
Technical Support Appliance - update to 3.0.1
Juniper Secure Analytics (JSA) - update to 7.5.0 UP10 IF02
Red Hat OpenShift Container Platform - addressed in versions 4.13.48, 4.15.28
kernel (Red Hat package) - update to 4.18.0-553.16.1.el8_10
kernel-rt (Red Hat package) - update to 4.18.0-553.16.1.rt7.357.el8_10
kernel-devel - update to 4.18.0-553.16.1.0.1
kernel-debug-devel - update to 4.18.0-553.16.1.0.1
kernel-headers - update to 4.18.0-553.16.1.0.1
kernel-modules - update to 4.18.0-553.16.1.0.1
kernel-modules-extra - update to 4.18.0-553.16.1.0.1
kernel-tools - update to 4.18.0-553.16.1.0.1
kernel-tools-libs - update to 4.18.0-553.16.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.16.1.0.1
perf - update to 4.18.0-553.16.1.0.1
python3-perf - update to 4.18.0-553.16.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.16.1.0.1
kernel-doc - update to 4.18.0-553.16.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.16.1.0.1
kernel-debug-modules - update to 4.18.0-553.16.1.0.1
kernel-debug-core - update to 4.18.0-553.16.1.0.1
kernel-debug - update to 4.18.0-553.16.1.0.1
kernel-cross-headers - update to 4.18.0-553.16.1.0.1
kernel-core - update to 4.18.0-553.16.1.0.1
kernel - update to 4.18.0-553.16.1.0.1
bpftool - update to 4.18.0-553.16.1.0.1
Session Smart Router - addressed in versions 6.2.10, 6.3.7
IBM Qradar SIEM - update to 7.5.0 Update Pack 10 IF01
Robotic Process Automation for Cloud Pak - addressed in versions 21.0.7.18, 23.0.19

External References

Related Security Bulletins