Use-after-free in Linux kernel - CVE-2021-46998

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Main Vulnerability Database Vulnerabilities #VU91070

Use-after-free in Linux kernel - CVE-2021-46998

Published: June 4, 2024 / Updated: May 13, 2025


Vulnerability identifier: #VU91070
CSH Severity: Low
CVSS v4 BT: 5.9 [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/E:U/U:Clear]
CVE-ID: CVE-2021-46998
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 enic_queue_wq_skb_encap(), enic_queue_wq_skb() and enic_hard_start_xmit() functions in drivers/net/ethernet/cisco/enic/enic_main.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
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 Real Time 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP2 Business Critical Linux
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
openSUSE Leap
openEuler
Dell Data Protection Central
PowerProtect DP Series Appliance (IDPA)
kgraft-patch-4_12_14-122_212-default
kernel-livepatch-5_3_18-150200_24_188-default
kernel-livepatch-SLE15-SP2_Update_47-debugsource
kernel-livepatch-5_3_18-150200_24_188-default-debuginfo
kernel-livepatch-5_3_18-150300_59_158-default-debuginfo
kernel-livepatch-5_3_18-150300_59_158-preempt
kernel-livepatch-5_3_18-150300_59_158-preempt-debuginfo
kernel-livepatch-SLE15-SP3_Update_43-debugsource
kernel-livepatch-5_3_18-150300_59_158-default
kernel-rt_debug-devel
kernel-rt-devel
gfs2-kmp-rt
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-rt-debuginfo
dlm-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt
kernel-devel-rt
cluster-md-kmp-rt-debuginfo
kernel-source-rt
kernel-rt_debug
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
kernel-devel-azure
kernel-azure
kernel-azure-base-debuginfo
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-base
kernel-source-azure
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
kernel-default-debuginfo
ocfs2-kmp-default
kernel-macros
kernel-default-devel
kernel-default-base
kernel-syms
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default
kernel-source
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
kernel-default-extra-debuginfo
kernel
kernel-tools
perf-debuginfo
python2-perf
python3-perf
python2-perf-debuginfo
bpftool-debuginfo
kernel-tools-debuginfo
kernel-debuginfo
kernel-tools-devel
kernel-debugsource
python3-perf-debuginfo
bpftool
perf
kernel-preempt-debugsource
kernel-preempt-devel
kernel-preempt-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-preempt
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-preempt-devel-debuginfo
kernel-64kb
kernel-64kb-devel
kernel-64kb-debugsource
dtb-amlogic
dtb-nvidia
dtb-apm
kernel-debug
cluster-md-kmp-64kb-debuginfo
dlm-kmp-64kb
dlm-kmp-preempt
kernel-obs-qa
kernel-kvmsmall
kernel-source-vanilla
kernel-docs-html
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
dlm-kmp-preempt-debuginfo
kernel-preempt-optional
reiserfs-kmp-preempt
cluster-md-kmp-preempt-debuginfo
kernel-preempt-extra
gfs2-kmp-preempt-debuginfo
kernel-preempt-extra-debuginfo
ocfs2-kmp-preempt
kernel-preempt-optional-debuginfo
kselftests-kmp-preempt
reiserfs-kmp-preempt-debuginfo
gfs2-kmp-preempt
ocfs2-kmp-64kb-debuginfo
kernel-debug-debuginfo
kernel-debug-livepatch-devel
kernel-debug-devel
kernel-kvmsmall-devel
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-debuginfo
kernel-debug-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-debug-debugsource
kernel-kvmsmall-devel-debuginfo
kselftests-kmp-default
kernel-preempt-livepatch-devel
kselftests-kmp-default-debuginfo
kernel-default-optional
kernel-default-optional-debuginfo
dtb-marvell
dtb-xilinx
kselftests-kmp-64kb-debuginfo
dtb-al
dtb-broadcom
cluster-md-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
dtb-socionext
dtb-mediatek
ocfs2-kmp-64kb
kernel-64kb-extra-debuginfo
dtb-exynos
gfs2-kmp-64kb
dtb-cavium
dtb-zte
dlm-kmp-64kb-debuginfo
kernel-64kb-livepatch-devel
kernel-64kb-optional
dtb-arm
kernel-64kb-extra
dtb-rockchip
reiserfs-kmp-64kb
dtb-allwinner
ocfs2-kmp-preempt-debuginfo
kselftests-kmp-preempt-debuginfo
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
dtb-aarch64
dtb-qcom
dtb-sprd
dtb-renesas
dtb-freescale
kselftests-kmp-64kb
cluster-md-kmp-preempt
dtb-hisilicon
gfs2-kmp-64kb-debuginfo
dtb-lg
dtb-altera
dtb-amd
kernel-default-base-rebuild

How to mitigate CVE-2021-46998

Install update from vendor's website.

Linux kernel - addressed in versions 4.19.191, 5.4.120, 5.10.38, 5.11.22, 5.12.5, 5.13
kgraft-patch-4_12_14-122_212-default - update to 1-8.11.1
kernel-livepatch-5_3_18-150200_24_188-default - update to 1-150200.5.3.3
kernel-livepatch-SLE15-SP2_Update_47-debugsource - update to 1-150200.5.3.3
kernel-livepatch-5_3_18-150200_24_188-default-debuginfo - update to 1-150200.5.3.3
kernel-livepatch-5_3_18-150300_59_158-default-debuginfo - update to 1-150300.7.3.5
kernel-livepatch-5_3_18-150300_59_158-preempt - update to 1-150300.7.3.5
kernel-livepatch-5_3_18-150300_59_158-preempt-debuginfo - update to 1-150300.7.3.5
kernel-livepatch-SLE15-SP3_Update_43-debugsource - update to 1-150300.7.3.5
kernel-livepatch-5_3_18-150300_59_158-default - update to 1-150300.7.3.5
kernel-rt_debug-devel - update to 4.12.14-10.182.1
kernel-rt-devel - update to 4.12.14-10.182.1
gfs2-kmp-rt - update to 4.12.14-10.182.1
cluster-md-kmp-rt - update to 4.12.14-10.182.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
dlm-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 - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
kernel-devel-rt - update to 4.12.14-10.182.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-source-rt - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
kernel-rt_debug - 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
kernel-devel-azure - update to 4.12.14-16.182.1
kernel-azure - update to 4.12.14-16.182.1
kernel-azure-base-debuginfo - update to 4.12.14-16.182.1
kernel-syms-azure - update to 4.12.14-16.182.1
kernel-azure-debuginfo - update to 4.12.14-16.182.1
kernel-azure-debugsource - update to 4.12.14-16.182.1
kernel-azure-devel - update to 4.12.14-16.182.1
kernel-azure-base - update to 4.12.14-16.182.1
kernel-source-azure - update to 4.12.14-16.182.1
dlm-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-debugsource - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
gfs2-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-base-debuginfo - update to 4.12.14-122.212.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-macros - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-devel - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-base - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1.150200.9.95.3, 5.3.18-150300.59.158.1.150300.18.92.5
kernel-syms - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-source - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-devel - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
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 - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-obs-build - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-man - update to 4.12.14-122.212.1
kernel-default-extra - addressed in versions 4.12.14-122.212.1, 5.3.18-150300.59.158.1
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150300.59.158.1
kernel-source - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel-tools - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
perf-debuginfo - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
python2-perf - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel-devel - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
python3-perf - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
python2-perf-debuginfo - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
bpftool-debuginfo - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel-tools-debuginfo - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel-debuginfo - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel-tools-devel - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel-debugsource - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
python3-perf-debuginfo - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
bpftool - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
perf - addressed in versions 4.19.90-2403.3.0.0244, 4.19.90-2403.4.0.0271
kernel-preempt-debugsource - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt-devel - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
reiserfs-kmp-default - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-livepatch - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-64kb - update to 5.3.18-150300.59.158.1
kernel-64kb-devel - update to 5.3.18-150300.59.158.1
kernel-64kb-debugsource - update to 5.3.18-150300.59.158.1
dtb-amlogic - update to 5.3.18-150300.59.158.1
dtb-nvidia - update to 5.3.18-150300.59.158.1
dtb-apm - update to 5.3.18-150300.59.158.1
kernel-debug - update to 5.3.18-150300.59.158.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dlm-kmp-64kb - update to 5.3.18-150300.59.158.1
dlm-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-obs-qa - update to 5.3.18-150300.59.158.1
kernel-kvmsmall - update to 5.3.18-150300.59.158.1
kernel-source-vanilla - update to 5.3.18-150300.59.158.1
kernel-docs-html - update to 5.3.18-150300.59.158.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.158.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt-optional - update to 5.3.18-150300.59.158.1
reiserfs-kmp-preempt - update to 5.3.18-150300.59.158.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt-extra - update to 5.3.18-150300.59.158.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.158.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.158.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.158.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.158.1
kernel-debug-livepatch-devel - update to 5.3.18-150300.59.158.1
kernel-debug-devel - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-livepatch-devel - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-debuginfo - update to 5.3.18-150300.59.158.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.158.1
kernel-debug-debugsource - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-default - update to 5.3.18-150300.59.158.1
kernel-preempt-livepatch-devel - update to 5.3.18-150300.59.158.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.158.1
kernel-default-optional - update to 5.3.18-150300.59.158.1
kernel-default-optional-debuginfo - update to 5.3.18-150300.59.158.1
dtb-marvell - update to 5.3.18-150300.59.158.1
dtb-xilinx - update to 5.3.18-150300.59.158.1
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dtb-al - update to 5.3.18-150300.59.158.1
dtb-broadcom - update to 5.3.18-150300.59.158.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.158.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.158.1
dtb-socionext - update to 5.3.18-150300.59.158.1
dtb-mediatek - update to 5.3.18-150300.59.158.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.158.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.158.1
dtb-exynos - update to 5.3.18-150300.59.158.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-cavium - update to 5.3.18-150300.59.158.1
dtb-zte - update to 5.3.18-150300.59.158.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-64kb-livepatch-devel - update to 5.3.18-150300.59.158.1
kernel-64kb-optional - update to 5.3.18-150300.59.158.1
dtb-arm - update to 5.3.18-150300.59.158.1
kernel-64kb-extra - update to 5.3.18-150300.59.158.1
dtb-rockchip - update to 5.3.18-150300.59.158.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-allwinner - update to 5.3.18-150300.59.158.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-zfcpdump - update to 5.3.18-150300.59.158.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.158.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.158.1
dtb-aarch64 - update to 5.3.18-150300.59.158.1
dtb-qcom - update to 5.3.18-150300.59.158.1
dtb-sprd - update to 5.3.18-150300.59.158.1
dtb-renesas - update to 5.3.18-150300.59.158.1
dtb-freescale - update to 5.3.18-150300.59.158.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.158.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.158.1
dtb-hisilicon - update to 5.3.18-150300.59.158.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dtb-lg - update to 5.3.18-150300.59.158.1
dtb-altera - update to 5.3.18-150300.59.158.1
dtb-amd - update to 5.3.18-150300.59.158.1
kernel-default-base-rebuild - update to 5.3.18-150300.59.158.1.150300.18.92.5

External References

Related Security Bulletins