Use-after-free in Linux kernel - CVE-2021-47670

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Main Vulnerability Database Vulnerabilities #VU107661

Use-after-free in Linux kernel - CVE-2021-47670

Published: April 22, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU107661
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-47670
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the pcan_usb_fd_decode_canmsg() and pcan_usb_fd_decode_status() functions in drivers/net/can/usb/peak_usb/pcan_usb_fd.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Anolis OS
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 Server - AUS
Red Hat Enterprise Linux Server - TUS
SUSE Linux Enterprise Live Patching
openEuler
IBM Qradar SIEM
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kgraft-patch-4_12_14-122_261-default
gfs2-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default
kernel-syms
cluster-md-kmp-default
kernel-default-debugsource
kernel-default-debuginfo
dlm-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-default-devel
kernel-default-base
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default
kernel-source
kernel-macros
kernel-devel
kernel-default-man
kernel-default-devel-debuginfo
kernel-default-kgraft
kernel-default-kgraft-devel
kernel (Red Hat package)
kernel-rt (Red Hat package)
perf
kernel-headers
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-cross-headers
kernel-core
kernel
bpftool
kernel-doc
kernel-abi-stablelists
python3-perf
kernel-modules
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-modules-extra
kernel-tools-devel
kernel-tools-debuginfo
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf-debuginfo
kernel-rt
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-source-rt
Technical Support Appliance

How to mitigate CVE-2021-47670

Install update from vendor's website.

Linux kernel - update to 5.10.11
IBM Qradar SIEM - update to 7.5.0 Update Pack 13 IF02
kgraft-patch-4_12_14-122_261-default - update to 1-8.3.1
Technical Support Appliance - update to 3.1.0
gfs2-kmp-default-debuginfo - update to 4.12.14-122.261.1
gfs2-kmp-default - update to 4.12.14-122.261.1
ocfs2-kmp-default - update to 4.12.14-122.261.1
kernel-syms - update to 4.12.14-122.261.1
cluster-md-kmp-default - update to 4.12.14-122.261.1
kernel-default-debugsource - update to 4.12.14-122.261.1
kernel-default-debuginfo - update to 4.12.14-122.261.1
dlm-kmp-default - update to 4.12.14-122.261.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.261.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.261.1
kernel-default-devel - update to 4.12.14-122.261.1
kernel-default-base - update to 4.12.14-122.261.1
kernel-default-base-debuginfo - update to 4.12.14-122.261.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.261.1
kernel-default - update to 4.12.14-122.261.1
kernel-source - update to 4.12.14-122.261.1
kernel-macros - update to 4.12.14-122.261.1
kernel-devel - update to 4.12.14-122.261.1
kernel-default-man - update to 4.12.14-122.261.1
kernel-default-devel-debuginfo - update to 4.12.14-122.261.1
kernel-default-kgraft - update to 4.12.14-122.261.1
kernel-default-kgraft-devel - update to 4.12.14-122.261.1
kernel (Red Hat package) - addressed in versions 4.18.0-193.164.1.el8_2, 4.18.0-305.170.1.el8_4, 4.18.0-372.158.1.el8_6, 4.18.0-477.107.1.el8_8, 4.18.0-553.69.1.el8_10
kernel-rt (Red Hat package) - update to 4.18.0-553.69.1.rt7.410.el8_10
perf - update to 4.18.0-553.69.1.0.1
kernel-headers - update to 4.18.0-553.69.1.0.1
kernel-devel - update to 4.18.0-553.69.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.69.1.0.1
kernel-debug-modules - update to 4.18.0-553.69.1.0.1
kernel-debug-devel - update to 4.18.0-553.69.1.0.1
kernel-debug-core - update to 4.18.0-553.69.1.0.1
kernel-debug - update to 4.18.0-553.69.1.0.1
kernel-cross-headers - update to 4.18.0-553.69.1.0.1
kernel-core - update to 4.18.0-553.69.1.0.1
kernel - update to 4.18.0-553.69.1.0.1
bpftool - update to 4.18.0-553.69.1.0.1
kernel-doc - update to 4.18.0-553.69.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.69.1.0.1
python3-perf - update to 4.18.0-553.69.1.0.1
kernel-modules - update to 4.18.0-553.69.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.69.1.0.1
kernel-tools-libs - update to 4.18.0-553.69.1.0.1
kernel-tools - update to 4.18.0-553.69.1.0.1
kernel-modules-extra - update to 4.18.0-553.69.1.0.1
kernel-tools-devel - update to 4.19.90-2505.1.0.0326
python3-perf - update to 4.19.90-2505.1.0.0326
kernel-tools-debuginfo - update to 4.19.90-2505.1.0.0326
kernel-tools - update to 4.19.90-2505.1.0.0326
kernel-source - update to 4.19.90-2505.1.0.0326
kernel-devel - update to 4.19.90-2505.1.0.0326
kernel-debugsource - update to 4.19.90-2505.1.0.0326
kernel-debuginfo - update to 4.19.90-2505.1.0.0326
bpftool-debuginfo - update to 4.19.90-2505.1.0.0326
bpftool - update to 4.19.90-2505.1.0.0326
perf - update to 4.19.90-2505.1.0.0326
perf-debuginfo - update to 4.19.90-2505.1.0.0326
python2-perf - update to 4.19.90-2505.1.0.0326
python2-perf-debuginfo - update to 4.19.90-2505.1.0.0326
python3-perf-debuginfo - update to 4.19.90-2505.1.0.0326
kernel - update to 4.19.90-2505.1.0.0326
kernel-rt - update to 5.3.18-150300.208.1
kernel-rt-debugsource - update to 5.3.18-150300.208.1
kernel-rt-debuginfo - update to 5.3.18-150300.208.1
kernel-source-rt - update to 5.3.18-150300.208.1

External References

Related Security Bulletins