Out-of-bounds write in Linux kernel - CVE-2026-45878

Vulnerability identifier: #VU132611

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-45878

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in the debug address watch handling in drm/amdkfd when processing a crafted watch_id value from userspace. A local user can supply a watch_id larger than INT_MAX to trigger memory access outside the watch_points array and cause a denial of service.

The issue is triggered by integer sign conversion of an unsigned watch_id to a signed value, which can also lead to invalid shift operations.

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 Live Patching
openSUSE Leap
Ubuntu
kernel-livepatch-SLE15-SP6_Update_28-debugsource
kernel-livepatch-6_4_0-150600_23_118-default-debuginfo
kernel-livepatch-6_4_0-150600_23_118-default
ocfs2-kmp-64kb
kselftests-kmp-default-debuginfo
kernel-obs-qa
kernel-default-optional
kselftests-kmp-default
kernel-default-extra-debuginfo
kernel-default-optional-debuginfo
dtb-qcom
dtb-arm
dtb-exynos
kernel-64kb-devel
kernel-64kb-optional
dtb-rockchip
ocfs2-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
kernel-64kb-debugsource
gfs2-kmp-64kb-debuginfo
dtb-nvidia
dtb-altera
kernel-64kb-devel-debuginfo
dtb-mediatek
dtb-hisilicon
dtb-amlogic
kselftests-kmp-64kb-debuginfo
kernel-syms
kernel-kvmsmall-vdso-debuginfo
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-kvmsmall
kernel-docs-html
kernel-source-vanilla
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-debug-vdso-debuginfo
kernel-default-extra
kernel-debug-vdso
kernel-kvmsmall-vdso
kernel-default-vdso-debuginfo
kernel-default-vdso
kernel-debug-devel
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-debug
kernel-64kb
dtb-aarch64
kernel-default-devel-debuginfo
kernel-default-livepatch
kernel-default-livepatch-devel
kernel-docs
kernel-source
kernel-macros
kernel-devel
kernel-default
kernel-default-devel
ocfs2-kmp-default
gfs2-kmp-default
kernel-default-debuginfo
reiserfs-kmp-64kb-debuginfo
reiserfs-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
cluster-md-kmp-default
dlm-kmp-default-debuginfo
reiserfs-kmp-default
dlm-kmp-default
kernel-obs-build
cluster-md-kmp-default-debuginfo
kernel-obs-build-debugsource
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
reiserfs-kmp-64kb
dtb-amd
dtb-broadcom
kselftests-kmp-64kb
dtb-allwinner
dlm-kmp-64kb
dtb-marvell
cluster-md-kmp-64kb-debuginfo
dlm-kmp-64kb-debuginfo
dtb-xilinx
dtb-socionext
cluster-md-kmp-64kb
dtb-amazon
dtb-cavium
dtb-lg
kernel-64kb-debuginfo
gfs2-kmp-64kb
kernel-64kb-extra-debuginfo
dtb-renesas
kernel-64kb-extra
dtb-apm
dtb-sprd
dtb-freescale
dtb-apple
kernel-default-base-rebuild
kernel-default-base
linux (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi-realtime (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE15-SP6_Update_28-debugsource - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150600_23_118-default-debuginfo - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150600_23_118-default - update to 1-150600.13.3.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.118.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
kernel-obs-qa - update to 6.4.0-150600.23.118.1
kernel-default-optional - update to 6.4.0-150600.23.118.1
kselftests-kmp-default - update to 6.4.0-150600.23.118.1
kernel-default-extra-debuginfo - update to 6.4.0-150600.23.118.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.118.1
dtb-qcom - update to 6.4.0-150600.23.118.1
dtb-arm - update to 6.4.0-150600.23.118.1
dtb-exynos - update to 6.4.0-150600.23.118.1
kernel-64kb-devel - update to 6.4.0-150600.23.118.1
kernel-64kb-optional - update to 6.4.0-150600.23.118.1
dtb-rockchip - update to 6.4.0-150600.23.118.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.118.1
kernel-64kb-debugsource - update to 6.4.0-150600.23.118.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
dtb-nvidia - update to 6.4.0-150600.23.118.1
dtb-altera - update to 6.4.0-150600.23.118.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150600.23.118.1
dtb-mediatek - update to 6.4.0-150600.23.118.1
dtb-hisilicon - update to 6.4.0-150600.23.118.1
dtb-amlogic - update to 6.4.0-150600.23.118.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
kernel-syms - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.118.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150600.23.118.1
kernel-zfcpdump-debugsource - update to 6.4.0-150600.23.118.1
kernel-zfcpdump - update to 6.4.0-150600.23.118.1
kernel-kvmsmall - update to 6.4.0-150600.23.118.1
kernel-docs-html - update to 6.4.0-150600.23.118.1
kernel-source-vanilla - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.118.1
kernel-default-extra - update to 6.4.0-150600.23.118.1
kernel-debug-vdso - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.118.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.118.1
kernel-default-vdso - update to 6.4.0-150600.23.118.1
kernel-debug-devel - update to 6.4.0-150600.23.118.1
kernel-debug-debugsource - update to 6.4.0-150600.23.118.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug - update to 6.4.0-150600.23.118.1
kernel-64kb - update to 6.4.0-150600.23.118.1
dtb-aarch64 - update to 6.4.0-150600.23.118.1
kernel-default-devel-debuginfo - update to 6.4.0-150600.23.118.1
kernel-default-livepatch - update to 6.4.0-150600.23.118.1
kernel-default-livepatch-devel - update to 6.4.0-150600.23.118.1
kernel-docs - update to 6.4.0-150600.23.118.1
kernel-source - update to 6.4.0-150600.23.118.1
kernel-macros - update to 6.4.0-150600.23.118.1
kernel-devel - update to 6.4.0-150600.23.118.1
kernel-default - update to 6.4.0-150600.23.118.1
kernel-default-devel - update to 6.4.0-150600.23.118.1
ocfs2-kmp-default - update to 6.4.0-150600.23.118.1
gfs2-kmp-default - update to 6.4.0-150600.23.118.1
kernel-default-debuginfo - update to 6.4.0-150600.23.118.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
cluster-md-kmp-default - update to 6.4.0-150600.23.118.1
dlm-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
reiserfs-kmp-default - update to 6.4.0-150600.23.118.1
dlm-kmp-default - update to 6.4.0-150600.23.118.1
kernel-obs-build - update to 6.4.0-150600.23.118.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
kernel-obs-build-debugsource - update to 6.4.0-150600.23.118.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
kernel-default-debugsource - update to 6.4.0-150600.23.118.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-amd - update to 6.4.0-150600.23.118.1
dtb-broadcom - update to 6.4.0-150600.23.118.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-allwinner - update to 6.4.0-150600.23.118.1
dlm-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-marvell - update to 6.4.0-150600.23.118.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
dtb-xilinx - update to 6.4.0-150600.23.118.1
dtb-socionext - update to 6.4.0-150600.23.118.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-amazon - update to 6.4.0-150600.23.118.1
dtb-cavium - update to 6.4.0-150600.23.118.1
dtb-lg - update to 6.4.0-150600.23.118.1
kernel-64kb-debuginfo - update to 6.4.0-150600.23.118.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.118.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.118.1
dtb-renesas - update to 6.4.0-150600.23.118.1
kernel-64kb-extra - update to 6.4.0-150600.23.118.1
dtb-apm - update to 6.4.0-150600.23.118.1
dtb-sprd - update to 6.4.0-150600.23.118.1
dtb-freescale - update to 6.4.0-150600.23.118.1
dtb-apple - update to 6.4.0-150600.23.118.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.118.1.150600.12.56.1
kernel-default-base - update to 6.4.0-150600.23.118.1.150600.12.56.1
linux (Ubuntu package) - addressed in versions 6.8.0-134.134, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61+fips1, 6.8.0-1058.61~22.04.1, 6.8.0-1060.61, 6.8.0-1060.63+fips1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69, 6.8.0-1063.69+fips1, 6.8.1-1055.56, 6.8.1-1055.56~22.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 6.8.0-134.134+fips1, 6.8.0-1062.69+fips1
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1029.30
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1045.48, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61.1, 6.8.0-1058.64, 6.8.0-1060.61~22.04.1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69~22.04.1
linux-raspi (Ubuntu package) - update to 6.8.0-1060.64
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-raspi-realtime (Ubuntu package) - update to 6.8.0-2049.50

• https://git.kernel.org/stable/c/2b36c0c1bcbbe15f6cfa9652084b3124c835a150
• https://git.kernel.org/stable/c/3c38a0f07aa2bfef2b219b1f045534ad93f85afd
• https://git.kernel.org/stable/c/5a19302cab5cec7ae7f1a60c619951e6c17d8742
• https://git.kernel.org/stable/c/971bf8e61e9b4abaacf9b35eaf76ec222758f9d6
• https://git.kernel.org/stable/c/a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488

• Out-of-bounds write in Linux kernel amd amdkfd driver
• SUSE update for the Linux Kernel
• Ubuntu update for linux
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux-aws-6.8
• Ubuntu update for linux-raspi-realtime
• Ubuntu update for linux-raspi
• Ubuntu update for linux-azure-fips
• Ubuntu update for linux-azure-fde-6.8
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-azure
• Ubuntu update for linux-hwe-6.8