Out-of-bounds read in Linux kernel - CVE-2026-31614

Vulnerability identifier: #VU127786

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-31614

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in check_wsl_eas() when processing extended attribute data from an SMB server response. A remote attacker can send a specially crafted server response to disclose sensitive information.

The issue can leak up to 8 bytes of kernel heap memory and can influence which WSL xattr the data is interpreted as.

Linux kernel
Debian Linux
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 Live Patching
openSUSE Leap
Ubuntu
kernel-livepatch-6_4_0-150600_23_115-default
kernel-livepatch-6_4_0-150600_23_115-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_27-debugsource
kernel-default-extra-debuginfo
cluster-md-kmp-default-debuginfo
reiserfs-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default
reiserfs-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-devel-debuginfo
cluster-md-kmp-default
kernel-default-debuginfo
kernel-syms
kernel-default-optional
gfs2-kmp-default-debuginfo
kernel-default-extra
kernel-docs
kernel-default-livepatch
kselftests-kmp-default
kernel-default-optional-debuginfo
gfs2-kmp-default
kselftests-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-default-devel
kernel-default-debugsource
kernel-obs-build-debugsource
kernel-obs-build
kernel-default-vdso-debuginfo
dtb-aarch64
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-kvmsmall
kernel-default-livepatch-devel
kernel-default-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-debug-vdso
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-default
kernel-debug-devel-debuginfo
kernel-debug-debuginfo
kernel-debug-devel
kernel-debug-debugsource
kernel-debug
kernel-source-vanilla
kernel-source
kernel-devel
kernel-docs-html
kernel-macros
dtb-apm
dtb-lg
kernel-64kb-extra
kernel-64kb-optional-debuginfo
kernel-64kb-extra-debuginfo
dtb-amd
kselftests-kmp-64kb-debuginfo
kernel-64kb-devel
dtb-exynos
dtb-renesas
dtb-marvell
ocfs2-kmp-64kb
gfs2-kmp-64kb
cluster-md-kmp-64kb-debuginfo
kernel-kvmsmall-debugsource
dtb-qcom
kernel-64kb-debugsource
kernel-64kb-devel-debuginfo
dtb-cavium
dtb-hisilicon
dlm-kmp-64kb-debuginfo
dtb-freescale
dtb-rockchip
gfs2-kmp-64kb-debuginfo
dlm-kmp-64kb
dtb-allwinner
kernel-64kb-optional
kernel-obs-qa
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel
kernel-64kb
dtb-nvidia
dtb-sprd
dtb-arm
kselftests-kmp-64kb
dtb-altera
kernel-64kb-debuginfo
dtb-broadcom
dtb-amazon
reiserfs-kmp-64kb-debuginfo
dtb-xilinx
dtb-apple
dtb-mediatek
ocfs2-kmp-64kb-debuginfo
dtb-amlogic
cluster-md-kmp-64kb
dtb-socionext
reiserfs-kmp-64kb
kernel-default-base
kernel-default-base-rebuild
linux (Debian package)
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

Install security update from vendor's repository.

kernel-livepatch-6_4_0-150600_23_115-default - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150600_23_115-default-debuginfo - update to 1-150600.13.3.1
kernel-livepatch-SLE15-SP6_Update_27-debugsource - update to 1-150600.13.3.1
kernel-default-extra-debuginfo - update to 6.4.0-150600.23.115.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150600.23.115.1
reiserfs-kmp-default - update to 6.4.0-150600.23.115.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.115.1
dlm-kmp-default - update to 6.4.0-150600.23.115.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150600.23.115.1
ocfs2-kmp-default - update to 6.4.0-150600.23.115.1
kernel-default-devel-debuginfo - update to 6.4.0-150600.23.115.1
cluster-md-kmp-default - update to 6.4.0-150600.23.115.1
kernel-default-debuginfo - update to 6.4.0-150600.23.115.1
kernel-syms - update to 6.4.0-150600.23.115.1
kernel-default-optional - update to 6.4.0-150600.23.115.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.115.1
kernel-default-extra - update to 6.4.0-150600.23.115.1
kernel-docs - update to 6.4.0-150600.23.115.1
kernel-default-livepatch - update to 6.4.0-150600.23.115.1
kselftests-kmp-default - update to 6.4.0-150600.23.115.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.115.1
gfs2-kmp-default - update to 6.4.0-150600.23.115.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.115.1
dlm-kmp-default-debuginfo - update to 6.4.0-150600.23.115.1
kernel-default-devel - update to 6.4.0-150600.23.115.1
kernel-default-debugsource - update to 6.4.0-150600.23.115.1
kernel-obs-build-debugsource - update to 6.4.0-150600.23.115.1
kernel-obs-build - update to 6.4.0-150600.23.115.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.115.1
dtb-aarch64 - update to 6.4.0-150600.23.115.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150600.23.115.1
kernel-zfcpdump-debugsource - update to 6.4.0-150600.23.115.1
kernel-zfcpdump - update to 6.4.0-150600.23.115.1
kernel-kvmsmall - update to 6.4.0-150600.23.115.1
kernel-default-livepatch-devel - update to 6.4.0-150600.23.115.1
kernel-default-vdso - update to 6.4.0-150600.23.115.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.115.1
kernel-debug-vdso - update to 6.4.0-150600.23.115.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.115.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.115.1
kernel-default - update to 6.4.0-150600.23.115.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.115.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.115.1
kernel-debug-devel - update to 6.4.0-150600.23.115.1
kernel-debug-debugsource - update to 6.4.0-150600.23.115.1
kernel-debug - update to 6.4.0-150600.23.115.1
kernel-source-vanilla - update to 6.4.0-150600.23.115.1
kernel-source - update to 6.4.0-150600.23.115.1
kernel-devel - update to 6.4.0-150600.23.115.1
kernel-docs-html - update to 6.4.0-150600.23.115.1
kernel-macros - update to 6.4.0-150600.23.115.1
dtb-apm - update to 6.4.0-150600.23.115.1
dtb-lg - update to 6.4.0-150600.23.115.1
kernel-64kb-extra - update to 6.4.0-150600.23.115.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.115.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.115.1
dtb-amd - update to 6.4.0-150600.23.115.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.115.1
kernel-64kb-devel - update to 6.4.0-150600.23.115.1
dtb-exynos - update to 6.4.0-150600.23.115.1
dtb-renesas - update to 6.4.0-150600.23.115.1
dtb-marvell - update to 6.4.0-150600.23.115.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.115.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.115.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.115.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.115.1
dtb-qcom - update to 6.4.0-150600.23.115.1
kernel-64kb-debugsource - update to 6.4.0-150600.23.115.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150600.23.115.1
dtb-cavium - update to 6.4.0-150600.23.115.1
dtb-hisilicon - update to 6.4.0-150600.23.115.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.115.1
dtb-freescale - update to 6.4.0-150600.23.115.1
dtb-rockchip - update to 6.4.0-150600.23.115.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.115.1
dlm-kmp-64kb - update to 6.4.0-150600.23.115.1
dtb-allwinner - update to 6.4.0-150600.23.115.1
kernel-64kb-optional - update to 6.4.0-150600.23.115.1
kernel-obs-qa - update to 6.4.0-150600.23.115.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.115.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.115.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.115.1
kernel-64kb - update to 6.4.0-150600.23.115.1
dtb-nvidia - update to 6.4.0-150600.23.115.1
dtb-sprd - update to 6.4.0-150600.23.115.1
dtb-arm - update to 6.4.0-150600.23.115.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.115.1
dtb-altera - update to 6.4.0-150600.23.115.1
kernel-64kb-debuginfo - update to 6.4.0-150600.23.115.1
dtb-broadcom - update to 6.4.0-150600.23.115.1
dtb-amazon - update to 6.4.0-150600.23.115.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.115.1
dtb-xilinx - update to 6.4.0-150600.23.115.1
dtb-apple - update to 6.4.0-150600.23.115.1
dtb-mediatek - update to 6.4.0-150600.23.115.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.115.1
dtb-amlogic - update to 6.4.0-150600.23.115.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.115.1
dtb-socionext - update to 6.4.0-150600.23.115.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.115.1
kernel-default-base - update to 6.4.0-150600.23.115.1.150600.12.54.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.115.1.150600.12.54.1
linux (Debian package) - update to 6.12.85-1
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

• https://git.kernel.org/stable/c/5cc0574c84aa73946ade587c41e81757b8b01cb5
• https://git.kernel.org/stable/c/a893f1757d9a4009e4a8d7ceb2312142fe29cea4
• https://git.kernel.org/stable/c/b2b76d09a64c538c57006180103fc1841e8cfa66
• https://git.kernel.org/stable/c/ba3ad159aa61810bbe0acaf39578b1ebfb6f1a18

• Out-of-bounds read in Linux kernel smb client
• Debian update for linux
• SUSE update for the Linux Kernel
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure