NULL pointer dereference in Linux kernel - CVE-2021-46964

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Main Vulnerability Database Vulnerabilities #VU90651

NULL pointer dereference in Linux kernel - CVE-2021-46964

Published: June 1, 2024 / Updated: May 14, 2025


Vulnerability identifier: #VU90651
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-2021-46964
CWE-ID: CWE-476
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 NULL pointer dereference within the qla24xx_enable_msix() function in drivers/scsi/qla2xxx/qla_isr.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
Dell Data Protection Central
PowerProtect DP Series Appliance (IDPA)
EMC Cloud Tiering Appliance
kgraft-patch-4_12_14-122_212-default
dlm-kmp-rt-debuginfo
kernel-rt-debuginfo
kernel-rt-debugsource
cluster-md-kmp-rt
gfs2-kmp-rt
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
kernel-rt_debug-debuginfo
dlm-kmp-rt
ocfs2-kmp-rt
kernel-rt_debug-debugsource
kernel-syms-rt
kernel-rt-devel-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-devel-rt
kernel-source-rt
kernel-rt_debug
kernel-rt
kernel-azure
kernel-devel-azure
kernel-azure-base
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-syms-azure
kernel-source-azure
kernel-azure-base-debuginfo
ocfs2-kmp-default
kernel-default-debuginfo
kernel-syms
kernel-default-base
kernel-default-devel
kernel-default-extra-debuginfo
dlm-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default
kernel-source
kernel-macros
kernel-devel
kernel-default-devel-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-docs
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-man
kernel-default-extra

How to mitigate CVE-2021-46964

Install update from vendor's website.

Linux kernel - addressed in versions 5.11.20, 5.12.3, 5.13
kgraft-patch-4_12_14-122_212-default - update to 1-8.11.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt-debugsource - update to 4.12.14-10.182.1
cluster-md-kmp-rt - update to 4.12.14-10.182.1
gfs2-kmp-rt - update to 4.12.14-10.182.1
kernel-rt-devel - update to 4.12.14-10.182.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.182.1
dlm-kmp-rt - update to 4.12.14-10.182.1
ocfs2-kmp-rt - update to 4.12.14-10.182.1
kernel-rt_debug-debugsource - update to 4.12.14-10.182.1
kernel-syms-rt - update to 4.12.14-10.182.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt-base-debuginfo - update to 4.12.14-10.182.1
kernel-rt-base - update to 4.12.14-10.182.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel - update to 4.12.14-10.182.1
kernel-devel-rt - update to 4.12.14-10.182.1
kernel-source-rt - update to 4.12.14-10.182.1
kernel-rt_debug - update to 4.12.14-10.182.1
kernel-rt - update to 4.12.14-10.182.1
kernel-azure - update to 4.12.14-16.182.1
kernel-devel-azure - update to 4.12.14-16.182.1
kernel-azure-base - update to 4.12.14-16.182.1
kernel-azure-devel - update to 4.12.14-16.182.1
kernel-azure-debugsource - update to 4.12.14-16.182.1
kernel-azure-debuginfo - update to 4.12.14-16.182.1
kernel-syms-azure - update to 4.12.14-16.182.1
kernel-source-azure - update to 4.12.14-16.182.1
kernel-azure-base-debuginfo - update to 4.12.14-16.182.1
ocfs2-kmp-default - update to 4.12.14-122.212.1
kernel-default-debuginfo - update to 4.12.14-122.212.1
kernel-syms - update to 4.12.14-122.212.1
kernel-default-base - update to 4.12.14-122.212.1
kernel-default-devel - update to 4.12.14-122.212.1
kernel-default-extra-debuginfo - update to 4.12.14-122.212.1
dlm-kmp-default - update to 4.12.14-122.212.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-debugsource - update to 4.12.14-122.212.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.212.1
gfs2-kmp-default - update to 4.12.14-122.212.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-base-debuginfo - update to 4.12.14-122.212.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.212.1
cluster-md-kmp-default - update to 4.12.14-122.212.1
kernel-default - update to 4.12.14-122.212.1
kernel-source - update to 4.12.14-122.212.1
kernel-macros - update to 4.12.14-122.212.1
kernel-devel - update to 4.12.14-122.212.1
kernel-default-devel-debuginfo - update to 4.12.14-122.212.1
kernel-default-kgraft-devel - update to 4.12.14-122.212.1
kernel-default-kgraft - update to 4.12.14-122.212.1
kernel-docs - update to 4.12.14-122.212.1
kernel-obs-build - update to 4.12.14-122.212.1
kernel-obs-build-debugsource - update to 4.12.14-122.212.1
kernel-default-man - update to 4.12.14-122.212.1
kernel-default-extra - update to 4.12.14-122.212.1
EMC Cloud Tiering Appliance - update to 13.2.0.2.29

External References

Related Security Bulletins