Improper access control in Linux kernel - CVE-2026-46076

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Main Vulnerability Database Vulnerabilities #VU132421

Improper access control in Linux kernel - CVE-2026-46076

Published: May 28, 2026


Vulnerability identifier: #VU132421
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-46076
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to bypass hypercall interception controls.

The vulnerability exists due to improper access control in KVM nested SVM handling when processing VMMCALL from an L2 guest. A remote user can invoke an unhandled VMMCALL to bypass hypercall interception controls.

Exploitation requires an active nested virtualization scenario where L2 is running, L1 does not intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the hypercall is not one of the supported Hyper-V hypercalls.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Micro Extras
SUSE Linux Micro
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
openSUSE Leap
Ubuntu
openEuler
kernel-livepatch-6_4_0-150600_23_125-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_29-debugsource
kernel-livepatch-6_4_0-150600_23_125-default
kernel-livepatch-6_4_0-150700_7_62-rt
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo
kernel-livepatch-6_4_0-150700_53_66-default-debuginfo
kernel-livepatch-6_4_0-150700_53_66-default
kernel-livepatch-SLE15-SP7_Update_18-debugsource
kernel (Red Hat package)
kernel-syms
kernel-default-debuginfo
kernel-default-debugsource
kernel-default
kernel-64kb
kernel-default-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-source
kernel-macros
kernel-devel
kernel-default-livepatch
kernel-kvmsmall
kernel-rt-devel-debuginfo
kernel-rt-devel
kernel-rt-debugsource
kernel-rt
kernel-default-devel
kernel-obs-build-debugsource
kernel-devel-rt
kernel-source-rt
kernel-rt-debuginfo
kernel-rt-livepatch
kernel-64kb-debugsource
kernel-64kb-devel
kernel-obs-build
reiserfs-kmp-64kb
dtb-freescale
ocfs2-kmp-64kb
dtb-rockchip
kernel-64kb-extra
dtb-mediatek
dtb-nvidia
dlm-kmp-64kb-debuginfo
kernel-64kb-extra-debuginfo
dtb-xilinx
gfs2-kmp-64kb
dtb-socionext
kernel-default-extra-debuginfo
kernel-default-optional-debuginfo
kselftests-kmp-default
dlm-kmp-default
reiserfs-kmp-default
dtb-hisilicon
dtb-qcom
dtb-sprd
kernel-64kb-optional
kselftests-kmp-64kb
dtb-altera
dtb-broadcom
kernel-64kb-devel-debuginfo
dtb-arm
dtb-renesas
cluster-md-kmp-64kb
dtb-cavium
ocfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb-debuginfo
gfs2-kmp-64kb-debuginfo
dtb-allwinner
dtb-exynos
dtb-apple
dtb-marvell
kernel-docs
kernel-docs-html
kernel-zfcpdump
kernel-default-livepatch-devel
kernel-debug-debugsource
kernel-debug-devel-debuginfo
kernel-debug-devel
kernel-debug-debuginfo
dtb-aarch64
kernel-debug
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-default-vdso
kernel-debug-vdso
kernel-default-vdso-debuginfo
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-optional
dlm-kmp-default-debuginfo
cluster-md-kmp-default
ocfs2-kmp-default
reiserfs-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
kernel-obs-qa
kernel-default-extra
gfs2-kmp-default
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-devel
kernel-source-vanilla
dtb-amd
kernel-64kb-debuginfo
dtb-apm
dtb-lg
kernel-64kb-optional-debuginfo
kselftests-kmp-64kb-debuginfo
dlm-kmp-64kb
dtb-amazon
cluster-md-kmp-64kb-debuginfo
dtb-amlogic
kernel-default-base
kernel-default-base-rebuild
ocfs2-kmp-rt
dlm-kmp-rt
gfs2-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
cluster-md-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-azure
kernel-azure-devel-debuginfo
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
python3-perf-debuginfo
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
kernel-extra-modules
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-aws (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)

How to mitigate CVE-2026-46076

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_4_0-150600_23_125-default-debuginfo - update to 1-150600.13.7.1
kernel-livepatch-SLE15-SP6_Update_29-debugsource - update to 1-150600.13.7.1
kernel-livepatch-6_4_0-150600_23_125-default - update to 1-150600.13.7.1
kernel-livepatch-6_4_0-150700_7_62-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_66-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_66-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_18-debugsource - update to 1-150700.15.3.1
kernel (Red Hat package) - addressed in versions 5.14.0-687.55.1.el9_8, 6.12.0-211.61.1.el10_2
kernel-syms - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-default-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-default-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-default - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-64kb - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-kvmsmall-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1
kernel-kvmsmall-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1
kernel-source - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-macros - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-devel - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-default-livepatch - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-kvmsmall - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1
kernel-rt-devel-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-devel - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-default-devel - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-devel-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-source-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-livepatch - update to 6.4.0-49.1
kernel-64kb-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-64kb-devel - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-obs-build - addressed in versions 6.4.0-49.1, 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-freescale - update to 6.4.0-150600.23.125.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-rockchip - update to 6.4.0-150600.23.125.1
kernel-64kb-extra - update to 6.4.0-150600.23.125.1
dtb-mediatek - update to 6.4.0-150600.23.125.1
dtb-nvidia - update to 6.4.0-150600.23.125.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.125.1
dtb-xilinx - update to 6.4.0-150600.23.125.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-socionext - update to 6.4.0-150600.23.125.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.125.1
kselftests-kmp-default - update to 6.4.0-150600.23.125.1
dlm-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
dtb-hisilicon - update to 6.4.0-150600.23.125.1
dtb-qcom - update to 6.4.0-150600.23.125.1
dtb-sprd - update to 6.4.0-150600.23.125.1
kernel-64kb-optional - update to 6.4.0-150600.23.125.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-altera - update to 6.4.0-150600.23.125.1
dtb-broadcom - update to 6.4.0-150600.23.125.1
kernel-64kb-devel-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
dtb-arm - update to 6.4.0-150600.23.125.1
dtb-renesas - update to 6.4.0-150600.23.125.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-cavium - update to 6.4.0-150600.23.125.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
dtb-allwinner - update to 6.4.0-150600.23.125.1
dtb-exynos - update to 6.4.0-150600.23.125.1
dtb-apple - update to 6.4.0-150600.23.125.1
dtb-marvell - update to 6.4.0-150600.23.125.1
kernel-docs - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.2
kernel-docs-html - update to 6.4.0-150600.23.125.1
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-debug-debugsource - update to 6.4.0-150600.23.125.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.125.1
kernel-debug-devel - update to 6.4.0-150600.23.125.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.125.1
dtb-aarch64 - update to 6.4.0-150600.23.125.1
kernel-debug - update to 6.4.0-150600.23.125.1
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.125.1
kernel-default-vdso - update to 6.4.0-150600.23.125.1
kernel-debug-vdso - update to 6.4.0-150600.23.125.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.125.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.125.1
kernel-default-optional - update to 6.4.0-150600.23.125.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-obs-qa - update to 6.4.0-150600.23.125.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.125.1
kernel-source-vanilla - update to 6.4.0-150600.23.125.1
dtb-amd - update to 6.4.0-150600.23.125.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.66.1
dtb-apm - update to 6.4.0-150600.23.125.1
dtb-lg - update to 6.4.0-150600.23.125.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.125.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
dlm-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-amazon - update to 6.4.0-150600.23.125.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
dtb-amlogic - update to 6.4.0-150600.23.125.1
kernel-default-base - addressed in versions 6.4.0-150600.23.125.1.150600.12.58.3, 6.4.0-150700.53.66.1.150700.17.39.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.125.1.150600.12.58.3
ocfs2-kmp-rt - update to 6.4.0-150700.7.62.1
dlm-kmp-rt - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-syms-rt - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.62.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-azure - update to 6.4.0-150700.53.66.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.66.1
kernel-azure-debugsource - update to 6.4.0-150700.53.66.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.66.1
kernel-azure-devel - update to 6.4.0-150700.53.66.1
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
bpftool - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
bpftool-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-debugsource - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-devel - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-headers - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-source - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-tools - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-tools-devel - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
perf - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
perf-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
python3-perf - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-extra-modules - update to 6.6.0-145.3.14.145
linux (Ubuntu package) - addressed in versions 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-27.27
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1, 7.0.0-1013.13
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-aws (Ubuntu package) - update to 6.8.0-1061.64+1
linux-raspi (Ubuntu package) - addressed in versions 6.8.0-1061.65, 6.8.0-2050.52, 7.0.0-1014.14
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1

External References

Related Security Bulletins