Out-of-bounds read in Linux kernel - CVE-2026-31470

Vulnerability identifier: #VU127677

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-31470

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the tdx guest quote handling logic when copying a host-controlled quote buffer to guest userspace. A local user can trigger quote retrieval to disclose sensitive information.

The leak may cross container protection boundaries in deployments exposing per-container configs-tsm-report interfaces.

Linux kernel
Debian Linux
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
openSUSE Leap
Ubuntu
kernel-livepatch-5_14_21-150500_55_166-default-debuginfo
kernel-livepatch-SLE15-SP5_Update_40-debugsource
kernel-livepatch-5_14_21-150500_55_166-default
kernel-livepatch-6_4_0-150700_7_54-rt
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo
kernel-livepatch-6_4_0-150700_53_55-default
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_15-debugsource
reiserfs-kmp-rt-debuginfo
reiserfs-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-rt_debug-debugsource
kernel-rt-debugsource
kselftests-kmp-rt
kernel-rt-extra-debuginfo
dlm-kmp-rt-debuginfo
kernel-rt-livepatch-devel
kernel-rt-debuginfo
kernel-rt-livepatch
gfs2-kmp-rt
kernel-rt_debug-devel
kernel-rt-devel
kselftests-kmp-rt-debuginfo
kernel-rt-extra
kernel-rt_debug-devel-debuginfo
kernel-devel-rt
kernel-source-rt
kernel-rt_debug
kernel-rt
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-vdso-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-vdso-debuginfo
kernel-rt-optional-debuginfo
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-vdso
kernel-rt_debug-debuginfo
cluster-md-kmp-rt
kernel-syms-rt
dlm-kmp-rt
kernel-rt-vdso
kernel-rt-optional
dtb-rockchip
dtb-arm
kernel-64kb-extra-debuginfo
dtb-amazon
dtb-mediatek
dtb-altera
kernel-64kb-optional-debuginfo
dlm-kmp-64kb-debuginfo
dtb-apple
reiserfs-kmp-64kb
dtb-allwinner
dtb-qcom
dtb-apm
reiserfs-kmp-64kb-debuginfo
dtb-socionext
dtb-marvell
dtb-amlogic
ocfs2-kmp-64kb
ocfs2-kmp-64kb-debuginfo
dtb-amd
cluster-md-kmp-64kb
dtb-sprd
dtb-xilinx
dtb-exynos
dtb-cavium
kernel-default-devel
kernel-64kb-devel-debuginfo
kernel-source
kernel-devel
kernel-macros
kernel-docs
kernel-64kb
kernel-64kb-devel
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-default
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-default-livepatch-devel
kernel-default-livepatch
dtb-freescale
ocfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default
kernel-obs-build
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-devel-debuginfo
kernel-syms
cluster-md-kmp-default
dlm-kmp-default
kernel-default-debuginfo
kernel-obs-build-debugsource
cluster-md-kmp-default-debuginfo
kselftests-kmp-64kb
kernel-docs-html
kernel-64kb-extra
dtb-renesas
cluster-md-kmp-64kb-debuginfo
dtb-hisilicon
dlm-kmp-64kb
dtb-nvidia
kernel-64kb-optional
kselftests-kmp-64kb-debuginfo
gfs2-kmp-64kb
dtb-lg
gfs2-kmp-64kb-debuginfo
dtb-broadcom
dtb-aarch64
kernel-kvmsmall
kernel-kvmsmall-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-source-vanilla
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel
kernel-default-extra
kernel-default-optional
kernel-default-optional-debuginfo
kselftests-kmp-default
kernel-obs-qa
kernel-default-extra-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-vdso
kernel-default-vdso-debuginfo
kernel-default-base-rebuild
kernel-default-base
kernel-azure-debugsource
kernel-azure
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-azure-devel
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-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)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-5_14_21-150500_55_166-default-debuginfo - update to 1-150500.11.3.1
kernel-livepatch-SLE15-SP5_Update_40-debugsource - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_55_166-default - update to 1-150500.11.3.1
kernel-livepatch-6_4_0-150700_7_54-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_55-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_15-debugsource - update to 1-150700.15.3.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.140.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.140.1
cluster-md-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-debugsource - update to 5.14.21-150500.13.140.1
kernel-rt-debugsource - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kselftests-kmp-rt - update to 5.14.21-150500.13.140.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.140.1
dlm-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.140.1
kernel-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-livepatch - update to 5.14.21-150500.13.140.1
gfs2-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.140.1
kernel-rt-devel - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt-extra - update to 5.14.21-150500.13.140.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.140.1
kernel-devel-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-source-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug - update to 5.14.21-150500.13.140.1
kernel-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
ocfs2-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt-devel-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.140.1
gfs2-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
ocfs2-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.140.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.140.1
cluster-md-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-syms-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
dlm-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-vdso - update to 5.14.21-150500.13.140.1
kernel-rt-optional - update to 5.14.21-150500.13.140.1
dtb-rockchip - update to 5.14.21-150500.55.166.1
dtb-arm - update to 5.14.21-150500.55.166.1
kernel-64kb-extra-debuginfo - update to 5.14.21-150500.55.166.1
dtb-amazon - update to 5.14.21-150500.55.166.1
dtb-mediatek - update to 5.14.21-150500.55.166.1
dtb-altera - update to 5.14.21-150500.55.166.1
kernel-64kb-optional-debuginfo - update to 5.14.21-150500.55.166.1
dlm-kmp-64kb-debuginfo - update to 5.14.21-150500.55.166.1
dtb-apple - update to 5.14.21-150500.55.166.1
reiserfs-kmp-64kb - update to 5.14.21-150500.55.166.1
dtb-allwinner - update to 5.14.21-150500.55.166.1
dtb-qcom - update to 5.14.21-150500.55.166.1
dtb-apm - update to 5.14.21-150500.55.166.1
reiserfs-kmp-64kb-debuginfo - update to 5.14.21-150500.55.166.1
dtb-socionext - update to 5.14.21-150500.55.166.1
dtb-marvell - update to 5.14.21-150500.55.166.1
dtb-amlogic - update to 5.14.21-150500.55.166.1
ocfs2-kmp-64kb - update to 5.14.21-150500.55.166.1
ocfs2-kmp-64kb-debuginfo - update to 5.14.21-150500.55.166.1
dtb-amd - update to 5.14.21-150500.55.166.1
cluster-md-kmp-64kb - update to 5.14.21-150500.55.166.1
dtb-sprd - update to 5.14.21-150500.55.166.1
dtb-xilinx - update to 5.14.21-150500.55.166.1
dtb-exynos - update to 5.14.21-150500.55.166.1
dtb-cavium - update to 5.14.21-150500.55.166.1
kernel-default-devel - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-64kb-devel-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-source - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-devel - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-macros - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-docs - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-64kb - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-64kb-devel - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-64kb-debugsource - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-64kb-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
reiserfs-kmp-default - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-zfcpdump - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-zfcpdump-debugsource - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-zfcpdump-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-livepatch-devel - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-livepatch - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dtb-freescale - update to 5.14.21-150500.55.166.1
ocfs2-kmp-default - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dlm-kmp-default-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-debugsource - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
gfs2-kmp-default - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-obs-build - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
gfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-devel-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-syms - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
cluster-md-kmp-default - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dlm-kmp-default - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-obs-build-debugsource - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kselftests-kmp-64kb - update to 5.14.21-150500.55.166.1
kernel-docs-html - update to 5.14.21-150500.55.166.1
kernel-64kb-extra - update to 5.14.21-150500.55.166.1
dtb-renesas - update to 5.14.21-150500.55.166.1
cluster-md-kmp-64kb-debuginfo - update to 5.14.21-150500.55.166.1
dtb-hisilicon - update to 5.14.21-150500.55.166.1
dlm-kmp-64kb - update to 5.14.21-150500.55.166.1
dtb-nvidia - update to 5.14.21-150500.55.166.1
kernel-64kb-optional - update to 5.14.21-150500.55.166.1
kselftests-kmp-64kb-debuginfo - update to 5.14.21-150500.55.166.1
gfs2-kmp-64kb - update to 5.14.21-150500.55.166.1
dtb-lg - update to 5.14.21-150500.55.166.1
gfs2-kmp-64kb-debuginfo - update to 5.14.21-150500.55.166.1
dtb-broadcom - update to 5.14.21-150500.55.166.1
dtb-aarch64 - update to 5.14.21-150500.55.166.1
kernel-kvmsmall - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-vdso - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-vdso-debuginfo - update to 5.14.21-150500.55.166.1
kernel-source-vanilla - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-debugsource - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-devel-debuginfo - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-debuginfo - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-devel - update to 5.14.21-150500.55.166.1
kernel-default-extra - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-optional - update to 5.14.21-150500.55.166.1
kernel-default-optional-debuginfo - update to 5.14.21-150500.55.166.1
kselftests-kmp-default - update to 5.14.21-150500.55.166.1
kernel-obs-qa - update to 5.14.21-150500.55.166.1
kernel-default-extra-debuginfo - addressed in versions 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kselftests-kmp-default-debuginfo - update to 5.14.21-150500.55.166.1
kernel-default-vdso - update to 5.14.21-150500.55.166.1
kernel-default-vdso-debuginfo - update to 5.14.21-150500.55.166.1
kernel-default-base-rebuild - update to 5.14.21-150500.55.166.1.150500.6.77.1
kernel-default-base - addressed in versions 5.14.21-150500.55.166.1.150500.6.77.1, 6.4.0-150700.53.55.1.150700.17.33.1
kernel-azure-debugsource - update to 6.4.0-150700.53.55.1
kernel-azure - update to 6.4.0-150700.53.55.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-devel - update to 6.4.0-150700.53.55.1
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
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
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-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
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
linux (Debian package) - update to 6.12.85-1

• https://git.kernel.org/stable/c/02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b
• https://git.kernel.org/stable/c/6f3c8795ae9ba74fa10fe979293d1904712d3fb1
• https://git.kernel.org/stable/c/a079a62883e3365de592cea9f7a669d8115433b0
• https://git.kernel.org/stable/c/c3fd16c3b98ed726294feab2f94f876290bf7b61

• Out-of-bounds read in Linux kernel coco tdx-guest driver
• Debian update for linux
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux
• Ubuntu update for linux-gcp-fips
• Ubuntu update for linux-oracle-6.8
• Ubuntu update for linux-fips
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-fde-6.8
• Ubuntu update for linux-azure-fips
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-hwe-6.8
• Ubuntu update for linux-aws-6.8
• Ubuntu update for linux-ibm