Missing authorization in Linux kernel - CVE-2021-28375

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Main Vulnerability Database Vulnerabilities #VU92415

Missing authorization in Linux kernel - CVE-2021-28375

Published: March 15, 2021 / Updated: May 13, 2025


Vulnerability identifier: #VU92415
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-2021-28375
CWE-ID: CWE-862
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to missing authorization error within the fastrpc_internal_invoke() function in drivers/misc/fastrpc.c. A local user can execute arbitrary code.


Affected software

Linux kernel
SUSE MicroOS
SUSE Linux Enterprise Module for Realtime
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise Module for Legacy Software
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Module for Public Cloud
Ubuntu
Fedora
kernel-livepatch-SLE15-SP2_Update_12-debugsource
kernel-livepatch-5_3_18-24_61-default-debuginfo
kernel-livepatch-5_3_18-24_61-default
kernel-livepatch-5_3_18-59_5-default
kernel-livepatch-5_3_18-59_5-default-debuginfo
kernel-livepatch-SLE15-SP3_Update_1-debugsource
kernel-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-source-azure
kernel-syms-azure
kernel-azure-devel-debuginfo
kernel-azure-devel
kernel-azure-debugsource
kernel-devel-azure
kernel-azure
kernel-azure-debuginfo
kernel-source
kernel-docs
kernel-preempt-devel-debuginfo
kernel-preempt-devel
kernel-preempt-debugsource
kernel-preempt-debuginfo
kernel-syms
kernel-obs-build-debugsource
kernel-obs-build
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default-devel
kernel-default-devel-debuginfo
kernel-preempt
kernel-devel
kernel-macros
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-livepatch
kernel-default
kernel-default-livepatch-devel
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-extra
kernel-default-extra-debuginfo
kernel-preempt-extra
kernel-preempt-extra-debuginfo
kernel-default-base
kernel-rt_debug-devel-debuginfo
dlm-kmp-rt-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt-debuginfo
gfs2-kmp-rt
gfs2-kmp-rt-debuginfo
kernel-rt-devel
kernel-rt-devel-debuginfo
kernel-rt_debug-debuginfo
kernel-rt_debug-debugsource
kernel-rt_debug-devel
kernel-syms-rt
ocfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-devel-rt
kernel-source-rt
cluster-md-kmp-rt
kernel-zfcpdump
kernel-64kb
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
linux-image-virtual (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-5.4.0-73-generic (Ubuntu package)
linux-image-5.4.0-73-generic-lpae (Ubuntu package)
linux-image-5.4.0-73-lowlatency (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1015-gkeop (Ubuntu package)
linux-image-gkeop-5.4 (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1035-raspi (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.4.0-1039-kvm (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-5.4.0-1043-gke (Ubuntu package)
linux-image-gke-5.4 (Ubuntu package)
linux-image-5.4.0-1043-gcp (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.4.0-1044-oracle (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.4.0-1045-oracle (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.4.0-1047-azure (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.4.0-1048-aws (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.6.0-1056-oem (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-5.8.0-53-generic-64k (Ubuntu package)
linux-image-5.8.0-53-lowlatency (Ubuntu package)
linux-image-5.8.0-53-generic-lpae (Ubuntu package)
linux-image-5.8.0-53-generic (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-5.8.0-1024-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1027-kvm (Ubuntu package)
linux-image-5.8.0-1029-oracle (Ubuntu package)
linux-image-5.8.0-1031-gcp (Ubuntu package)
linux-image-5.8.0-1032-azure (Ubuntu package)
linux-image-5.8.0-1033-aws (Ubuntu package)
linux-image-5.10.0-1021-oem (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
kernel-tools
kernel-headers
kernel

How to mitigate CVE-2021-28375

Install update from vendor's repository.

Linux kernel - addressed in versions 5.4.106, 5.10.24, 5.11.7, 5.12
kernel-livepatch-SLE15-SP2_Update_12-debugsource - update to 1-5.3.4
kernel-livepatch-5_3_18-24_61-default-debuginfo - update to 1-5.3.4
kernel-livepatch-5_3_18-24_61-default - update to 1-5.3.4
kernel-livepatch-5_3_18-59_5-default - update to 1-7.5.1
kernel-livepatch-5_3_18-59_5-default-debuginfo - update to 1-7.5.1
kernel-livepatch-SLE15-SP3_Update_1-debugsource - update to 1-7.5.1
kernel-rt - addressed in versions 5.3.18-8.7.1, 5.3.18-33.1
kernel-rt-debuginfo - addressed in versions 5.3.18-8.7.1, 5.3.18-33.1
kernel-rt-debugsource - addressed in versions 5.3.18-8.7.1, 5.3.18-33.1
kernel-source-azure - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-syms-azure - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-azure-devel-debuginfo - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-azure-devel - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-azure-debugsource - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-devel-azure - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-azure - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-azure-debuginfo - addressed in versions 5.3.18-18.41.1, 5.3.18-38.3.1
kernel-source - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-docs - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-preempt-devel - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-preempt-debugsource - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-preempt-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-syms - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.1
kernel-obs-build-debugsource - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.1
kernel-obs-build - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
reiserfs-kmp-default - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-devel - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-devel-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-preempt - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-devel - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-macros - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
cluster-md-kmp-default - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
cluster-md-kmp-default-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
dlm-kmp-default - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
dlm-kmp-default-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
gfs2-kmp-default - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
gfs2-kmp-default-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
ocfs2-kmp-default - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
ocfs2-kmp-default-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-livepatch - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-livepatch-devel - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-debugsource - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-extra - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-extra-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-preempt-extra - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-preempt-extra-debuginfo - addressed in versions 5.3.18-24.61.1, 5.3.18-59.5.2
kernel-default-base - addressed in versions 5.3.18-24.61.1.9.26.4, 5.3.18-59.5.2.18.2.2
kernel-rt_debug-devel-debuginfo - update to 5.3.18-33.1
dlm-kmp-rt-debuginfo - update to 5.3.18-33.1
dlm-kmp-rt - update to 5.3.18-33.1
cluster-md-kmp-rt-debuginfo - update to 5.3.18-33.1
gfs2-kmp-rt - update to 5.3.18-33.1
gfs2-kmp-rt-debuginfo - update to 5.3.18-33.1
kernel-rt-devel - update to 5.3.18-33.1
kernel-rt-devel-debuginfo - update to 5.3.18-33.1
kernel-rt_debug-debuginfo - update to 5.3.18-33.1
kernel-rt_debug-debugsource - update to 5.3.18-33.1
kernel-rt_debug-devel - update to 5.3.18-33.1
kernel-syms-rt - update to 5.3.18-33.1
ocfs2-kmp-rt - update to 5.3.18-33.1
ocfs2-kmp-rt-debuginfo - update to 5.3.18-33.1
kernel-devel-rt - update to 5.3.18-33.1
kernel-source-rt - update to 5.3.18-33.1
cluster-md-kmp-rt - update to 5.3.18-33.1
kernel-zfcpdump - update to 5.3.18-59.5.2
kernel-64kb - update to 5.3.18-59.5.2
kernel-64kb-debuginfo - update to 5.3.18-59.5.2
kernel-64kb-debugsource - update to 5.3.18-59.5.2
kernel-64kb-devel - update to 5.3.18-59.5.2
kernel-64kb-devel-debuginfo - update to 5.3.18-59.5.2
kernel-zfcpdump-debuginfo - update to 5.3.18-59.5.2
kernel-zfcpdump-debugsource - update to 5.3.18-59.5.2
linux-image-virtual (Ubuntu package) - addressed in versions 5.4.0.73.76, 5.8.0.53.58
linux-image-generic (Ubuntu package) - addressed in versions 5.4.0.73.76, 5.8.0.53.58
linux-image-generic-lpae (Ubuntu package) - addressed in versions 5.4.0.73.76, 5.8.0.53.58
linux-image-lowlatency (Ubuntu package) - addressed in versions 5.4.0.73.76, 5.8.0.53.58
linux-image-oem (Ubuntu package) - addressed in versions 5.4.0.73.76, 5.4.0.73.82~18.04.66
linux-image-oem-osp1 (Ubuntu package) - addressed in versions 5.4.0.73.76, 5.4.0.73.82~18.04.66
linux-image-5.4.0-73-generic (Ubuntu package) - addressed in versions 5.4.0-73.82, 5.4.0-73.82~18.04.1
linux-image-5.4.0-73-generic-lpae (Ubuntu package) - addressed in versions 5.4.0-73.82, 5.4.0-73.82~18.04.1
linux-image-5.4.0-73-lowlatency (Ubuntu package) - addressed in versions 5.4.0-73.82, 5.4.0-73.82~18.04.1
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.73.82~18.04.66
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.73.82~18.04.66
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.73.82~18.04.66
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.73.82~18.04.66
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.73.82~18.04.66
linux-image-5.4.0-1015-gkeop (Ubuntu package) - addressed in versions 5.4.0-1015.16, 5.4.0-1015.16~18.04.1
linux-image-gkeop-5.4 (Ubuntu package) - addressed in versions 5.4.0.1015.16~18.04.16, 5.4.0.1015.18
linux-image-gkeop (Ubuntu package) - update to 5.4.0.1015.18
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1035.37
linux-image-5.4.0-1035-raspi (Ubuntu package) - addressed in versions 5.4.0-1035.38, 5.4.0-1035.38~18.04.1
linux-image-raspi (Ubuntu package) - addressed in versions 5.4.0.1035.70, 5.8.0.1024.27
linux-image-raspi2 (Ubuntu package) - update to 5.4.0.1035.70
linux-image-kvm (Ubuntu package) - addressed in versions 5.4.0.1039.37, 5.8.0.1027.29
linux-image-5.4.0-1039-kvm (Ubuntu package) - update to 5.4.0-1039.40
linux-image-gcp (Ubuntu package) - addressed in versions 5.4.0.1043.30, 5.4.0.1043.52, 5.8.0.1031.31
linux-image-5.4.0-1043-gke (Ubuntu package) - addressed in versions 5.4.0-1043.45, 5.4.0-1043.45~18.04.1
linux-image-gke-5.4 (Ubuntu package) - addressed in versions 5.4.0.1043.45~18.04.9, 5.4.0.1043.52
linux-image-5.4.0-1043-gcp (Ubuntu package) - addressed in versions 5.4.0-1043.46, 5.4.0-1043.46~18.04.1
linux-image-gke (Ubuntu package) - addressed in versions 5.4.0.1043.52, 5.8.0.1031.31
linux-image-5.4.0-1044-oracle (Ubuntu package) - update to 5.4.0-1044.47~18.04.1
linux-image-oracle (Ubuntu package) - addressed in versions 5.4.0.1044.47~18.04.26, 5.4.0.1045.44, 5.8.0.1029.28
linux-image-5.4.0-1045-oracle (Ubuntu package) - update to 5.4.0-1045.49+1
linux-image-azure (Ubuntu package) - addressed in versions 5.4.0.1047.26, 5.4.0.1047.45, 5.8.0.1032.32
linux-image-5.4.0-1047-azure (Ubuntu package) - addressed in versions 5.4.0-1047.49, 5.4.0-1047.49~18.04.1
linux-image-aws (Ubuntu package) - addressed in versions 5.4.0.1048.30, 5.4.0.1048.49, 5.8.0.1033.35
linux-image-5.4.0-1048-aws (Ubuntu package) - addressed in versions 5.4.0-1048.50, 5.4.0-1048.50~18.04.1
linux-image-oem-20.04 (Ubuntu package) - addressed in versions 5.6.0.1056.52, 5.8.0.53.58
linux-image-5.6.0-1056-oem (Ubuntu package) - update to 5.6.0-1056.60
linux-image-generic-64k (Ubuntu package) - update to 5.8.0.53.58
linux-image-5.8.0-53-generic-64k (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-lowlatency (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic-lpae (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-5.8.0-1024-raspi (Ubuntu package) - update to 5.8.0-1024.27
linux-image-raspi-nolpae (Ubuntu package) - update to 5.8.0.1024.27
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package) - update to 5.8.0-1024.27
linux-image-5.8.0-1027-kvm (Ubuntu package) - update to 5.8.0-1027.29
linux-image-5.8.0-1029-oracle (Ubuntu package) - update to 5.8.0-1029.30
linux-image-5.8.0-1031-gcp (Ubuntu package) - update to 5.8.0-1031.32
linux-image-5.8.0-1032-azure (Ubuntu package) - update to 5.8.0-1032.34
linux-image-5.8.0-1033-aws (Ubuntu package) - update to 5.8.0-1033.35
linux-image-5.10.0-1021-oem (Ubuntu package) - update to 5.10.0-1021.22
linux-image-oem-20.04b (Ubuntu package) - update to 5.10.0.1021.22
kernel-tools - addressed in versions 5.11.7-100.fc32, 5.11.7-200.fc33, 5.11.7-300.fc34
kernel-headers - addressed in versions 5.11.7-100.fc32, 5.11.7-200.fc33, 5.11.7-300.fc34
kernel - addressed in versions 5.11.7-100.fc32, 5.11.7-200.fc33, 5.11.7-300.fc34

External References

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