Use of uninitialized resource in Linux kernel - CVE-2025-21959

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Main Vulnerability Database Vulnerabilities #VU106840

Use of uninitialized resource in Linux kernel - CVE-2025-21959

Published: April 2, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU106840
CSH Severity: Low
CVSS v4 BT: 4.3 [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/E:U/U:Clear]
CVE-ID: CVE-2025-21959
CWE-ID: CWE-908
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to use of uninitialized resource within the raw_smp_processor_id() function in net/netfilter/nf_conncount.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
Confidential Computing Module
SUSE Linux Enterprise Live Patching
Basesystem Module
Development Tools Module
Legacy Module
openSUSE Leap
Ubuntu
openEuler
kernel-livepatch-6_4_0-150600_23_60-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_13-debugsource
kernel-livepatch-6_4_0-150600_23_60-default
linux (Ubuntu package)
linux-hwe-5.4 (Ubuntu package)
linux-iot (Ubuntu package)
linux-bluefield (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-raspi (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-5.4 (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-intel-iotg-5.15 (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux (Debian package)
kernel-coco_debug
kernel-coco
kernel-coco_debug-debuginfo
kernel-coco-devel
kernel-coco_debug-debugsource
kernel-devel-coco
kernel-source-coco
kernel-syms-coco
kernel-coco-vdso-debuginfo
kernel-coco_debug-devel
reiserfs-kmp-coco
kernel-coco_debug-devel-debuginfo
kernel-coco-debuginfo
reiserfs-kmp-coco-debuginfo
kernel-coco-debugsource
kernel-obs-qa
dtb-broadcom
dtb-apm
dtb-nvidia
kernel-obs-build-debugsource
dtb-allwinner
dtb-qcom
dtb-socionext
kernel-obs-build
dtb-hisilicon
dtb-freescale
dtb-marvell
dtb-amazon
dtb-aarch64
dtb-amd
dtb-arm
dtb-apple
dtb-lg
dtb-altera
dtb-exynos
dtb-amlogic
dtb-sprd
dtb-cavium
dtb-rockchip
dtb-xilinx
kernel-docs
dtb-mediatek
kernel-docs-html
dtb-renesas
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-kvmsmall-vdso-debuginfo
kernel-debug-vdso
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel
dlm-kmp-64kb
kernel-64kb-debugsource
kernel-debug-devel-debuginfo
kselftests-kmp-64kb-debuginfo
kernel-debug
cluster-md-kmp-64kb
cluster-md-kmp-64kb-debuginfo
kernel-64kb-extra
kernel-source-vanilla
kernel-devel
reiserfs-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
kernel-source
kernel-macros
kernel-kvmsmall-debuginfo
kernel-64kb-debuginfo
reiserfs-kmp-64kb
kernel-64kb-extra-debuginfo
ocfs2-kmp-64kb
kernel-syms
kernel-64kb-devel-debuginfo
kernel-64kb-optional
gfs2-kmp-64kb-debuginfo
kernel-64kb
kernel-64kb-devel
kernel-kvmsmall-devel
kernel-zfcpdump-debuginfo
kernel-kvmsmall-debugsource
ocfs2-kmp-64kb-debuginfo
kernel-kvmsmall-devel-debuginfo
kselftests-kmp-64kb
kernel-debug-vdso-debuginfo
gfs2-kmp-64kb
kernel-kvmsmall-vdso
kernel-kvmsmall
dlm-kmp-64kb-debuginfo
dlm-kmp-default
kernel-default
kernel-default-livepatch-devel
kernel-default-vdso
kernel-default-vdso-debuginfo
dlm-kmp-default-debuginfo
reiserfs-kmp-default
kselftests-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default
kernel-default-debuginfo
cluster-md-kmp-default
kernel-default-optional
kernel-default-devel
kernel-default-optional-debuginfo
kernel-default-debugsource
kernel-default-extra-debuginfo
kernel-default-devel-debuginfo
kernel-default-extra
kernel-default-livepatch
ocfs2-kmp-default-debuginfo
reiserfs-kmp-default-debuginfo
kselftests-kmp-default
gfs2-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-base
kernel-default-base-rebuild
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-extra-modules
linux-hwe-6.8 (Ubuntu package)
linux-azure-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-oem-6.11 (Ubuntu package)

How to mitigate CVE-2025-21959

Install update from vendor's website.

Linux kernel - update to 6.6.84
kernel-livepatch-6_4_0-150600_23_60-default-debuginfo - update to 1-150600.13.6.4
kernel-livepatch-SLE15-SP6_Update_13-debugsource - update to 1-150600.13.6.4
kernel-livepatch-6_4_0-150600_23_60-default - update to 1-150600.13.6.4
linux (Ubuntu package) - addressed in versions 5.4.0.218.210, 5.4.0-218.238, 5.4.0.1065.65, 5.4.0-1065.69, 5.4.0-1093.98, 5.4.0.1093.98~18.04.1, 5.4.0-1093.98~18.04.1, 5.4.0.1093.122, 5.4.0.1134.130, 5.4.0-1134.143, 5.4.0.1145.139, 5.4.0-1145.155, 5.4.0-1145.155~18.04.1, 5.4.0.1145.155~18.04.1, 5.4.0.1147.144, 5.4.0-1147.157, 5.4.0-1147.157~18.04.1, 5.4.0.1147.157~18.04.1, 5.4.0.1150.152, 5.4.0-1150.159, 5.4.0-1150.159~18.04.1, 5.4.0.1150.159~18.04.1, 5.4.0.1152.146, 5.4.0-1152.159, 5.15.0.142.128, 5.15.0.142.137, 5.15.0-142.152, 5.15.0-1028.28, 5.15.0.1028.30, 5.15.0-1039.39, 5.15.0.1039.39, 5.15.0.1068.67, 5.15.0-1068.76, 5.15.0.1078.74, 5.15.0-1078.81, 5.15.0.1080.80, 5.15.0-1080.81, 5.15.0.1082.78, 5.15.0-1082.87, 5.15.0.1083.79, 5.15.0.1083.82, 5.15.0-1083.89, 5.15.0.1085.81, 5.15.0-1085.94, 6.8.0-84.84, 6.8.0-84.84.1, 6.8.0-84.84.1~22.04.1, 6.8.0-1023.25, 6.8.0-1036.40, 6.8.0-1039.41, 6.8.0-1040.42, 6.11.0-28.28, 6.11.0-28.28~24.04.1, 6.11.0-1011.11, 6.11.0-1014.14, 6.11.0-1015.16, 6.11.0-1016.16, 6.11.0-1016.16~24.04.1, 6.11.0-1017.18
linux-hwe-5.4 (Ubuntu package) - addressed in versions 5.4.0.218.238~18.04.1, 5.4.0-218.238~18.04.1
linux-iot (Ubuntu package) - update to 5.4.0-1051.54
linux-bluefield (Ubuntu package) - addressed in versions 5.4.0.1106.102, 5.4.0-1106.113
linux-azure-fips (Ubuntu package) - addressed in versions 5.4.0.1121.118, 5.4.0-1121.131, 5.4.0.1153.90, 5.4.0-1153.160+fips1, 5.15.0.1091.76, 5.15.0-1091.100+fips1
linux-raspi (Ubuntu package) - addressed in versions 5.4.0-1130.143, 5.4.0-1130.143~18.04.1, 5.4.0.1130.143~18.04.1, 5.4.0.1130.161, 5.15.0.1080.78, 5.15.0-1080.83, 6.8.0-1039.43
linux-aws-fips (Ubuntu package) - addressed in versions 5.4.0.1147.94, 5.4.0-1147.157+fips1, 5.4.0.1150.92, 5.4.0-1150.159+fips1, 5.15.0.142.82, 5.15.0-142.152+fips1, 5.15.0.1085.75, 5.15.0-1085.94+fips1, 5.15.0.1086.82, 5.15.0-1086.93+fips1
linux-azure-5.4 (Ubuntu package) - addressed in versions 5.4.0.1152.159~18.04.1, 5.4.0-1152.159~18.04.1
linux-hwe-5.15 (Ubuntu package) - addressed in versions 5.15.0.142.152~20.04.1, 5.15.0-142.152~20.04.1
linux-aws-5.15 (Ubuntu package) - addressed in versions 5.15.0-142.152~20.04.1, 5.15.0.142.152~20.04.1, 5.15.0-1078.81~20.04.1, 5.15.0.1078.81~20.04.1, 5.15.0-1083.89~20.04.1, 5.15.0.1083.89~20.04.1, 5.15.0.1085.94~20.04.1, 5.15.0-1085.94~20.04.1, 5.15.0-1086.93~20.04.1, 5.15.0.1086.93~20.04.1
linux-xilinx-zynqmp (Ubuntu package) - addressed in versions 5.15.0.1050.53, 5.15.0-1050.54
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1079.81, 5.15.0.1079.83, 5.15.0.1086.90, 5.15.0-1086.95
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1081.81, 5.15.0-1081.87
linux-intel-iotg-5.15 (Ubuntu package) - addressed in versions 5.15.0.1083.89~20.04.1, 5.15.0-1083.89~20.04.1
linux-aws (Ubuntu package) - addressed in versions 5.15.0.1086.89, 5.15.0-1086.93
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1091.89, 5.15.0-1091.100, 6.8.0-1036.42~22.04.1, 6.8.0-1038.44, 6.11.0-1018.18, 6.11.0-1018.18~24.04.1
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0.1091.100~20.04.1, 5.15.0-1091.100~20.04.1
linux (Debian package) - update to 6.1.133-1
kernel-coco_debug - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-devel - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug-debugsource - update to 6.4.0-15061.28.coco15sp6.1
kernel-devel-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-source-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-syms-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-vdso-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug-devel - update to 6.4.0-15061.28.coco15sp6.1
reiserfs-kmp-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug-devel-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
reiserfs-kmp-coco-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-debugsource - update to 6.4.0-15061.28.coco15sp6.1
kernel-obs-qa - update to 6.4.0-150600.23.60.2
dtb-broadcom - update to 6.4.0-150600.23.60.3
dtb-apm - update to 6.4.0-150600.23.60.3
dtb-nvidia - update to 6.4.0-150600.23.60.3
kernel-obs-build-debugsource - update to 6.4.0-150600.23.60.3
dtb-allwinner - update to 6.4.0-150600.23.60.3
dtb-qcom - update to 6.4.0-150600.23.60.3
dtb-socionext - update to 6.4.0-150600.23.60.3
kernel-obs-build - update to 6.4.0-150600.23.60.3
dtb-hisilicon - update to 6.4.0-150600.23.60.3
dtb-freescale - update to 6.4.0-150600.23.60.3
dtb-marvell - update to 6.4.0-150600.23.60.3
dtb-amazon - update to 6.4.0-150600.23.60.3
dtb-aarch64 - update to 6.4.0-150600.23.60.3
dtb-amd - update to 6.4.0-150600.23.60.3
dtb-arm - update to 6.4.0-150600.23.60.3
dtb-apple - update to 6.4.0-150600.23.60.3
dtb-lg - update to 6.4.0-150600.23.60.3
dtb-altera - update to 6.4.0-150600.23.60.3
dtb-exynos - update to 6.4.0-150600.23.60.3
dtb-amlogic - update to 6.4.0-150600.23.60.3
dtb-sprd - update to 6.4.0-150600.23.60.3
dtb-cavium - update to 6.4.0-150600.23.60.3
dtb-rockchip - update to 6.4.0-150600.23.60.3
dtb-xilinx - update to 6.4.0-150600.23.60.3
kernel-docs - update to 6.4.0-150600.23.60.3
dtb-mediatek - update to 6.4.0-150600.23.60.3
kernel-docs-html - update to 6.4.0-150600.23.60.3
dtb-renesas - update to 6.4.0-150600.23.60.3
kernel-zfcpdump-debugsource - update to 6.4.0-150600.23.60.4
kernel-zfcpdump - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.60.4
kernel-debug-vdso - update to 6.4.0-150600.23.60.4
kernel-debug-debugsource - update to 6.4.0-150600.23.60.4
kernel-debug-debuginfo - update to 6.4.0-150600.23.60.4
kernel-debug-devel - update to 6.4.0-150600.23.60.4
dlm-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-64kb-debugsource - update to 6.4.0-150600.23.60.4
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.60.4
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-debug - update to 6.4.0-150600.23.60.4
cluster-md-kmp-64kb - update to 6.4.0-150600.23.60.4
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-extra - update to 6.4.0-150600.23.60.4
kernel-source-vanilla - update to 6.4.0-150600.23.60.4
kernel-devel - update to 6.4.0-150600.23.60.4
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.60.4
kernel-source - update to 6.4.0-150600.23.60.4
kernel-macros - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-debuginfo - update to 6.4.0-150600.23.60.4
reiserfs-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.60.4
ocfs2-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-syms - update to 6.4.0-150600.23.60.4
kernel-64kb-devel-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-optional - update to 6.4.0-150600.23.60.4
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb - update to 6.4.0-150600.23.60.4
kernel-64kb-devel - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-devel - update to 6.4.0-150600.23.60.4
kernel-zfcpdump-debuginfo - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.60.4
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.60.4
kselftests-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.60.4
gfs2-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.60.4
kernel-kvmsmall - update to 6.4.0-150600.23.60.4
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
dlm-kmp-default - update to 6.4.0-150600.23.60.5
kernel-default - update to 6.4.0-150600.23.60.5
kernel-default-livepatch-devel - update to 6.4.0-150600.23.60.5
kernel-default-vdso - update to 6.4.0-150600.23.60.5
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.60.5
dlm-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
reiserfs-kmp-default - update to 6.4.0-150600.23.60.5
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
gfs2-kmp-default - update to 6.4.0-150600.23.60.5
ocfs2-kmp-default - update to 6.4.0-150600.23.60.5
kernel-default-debuginfo - update to 6.4.0-150600.23.60.5
cluster-md-kmp-default - update to 6.4.0-150600.23.60.5
kernel-default-optional - update to 6.4.0-150600.23.60.5
kernel-default-devel - update to 6.4.0-150600.23.60.5
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.60.5
kernel-default-debugsource - update to 6.4.0-150600.23.60.5
kernel-default-extra-debuginfo - update to 6.4.0-150600.23.60.5
kernel-default-devel-debuginfo - update to 6.4.0-150600.23.60.5
kernel-default-extra - update to 6.4.0-150600.23.60.5
kernel-default-livepatch - update to 6.4.0-150600.23.60.5
ocfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
reiserfs-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
kselftests-kmp-default - update to 6.4.0-150600.23.60.5
gfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
cluster-md-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
kernel-default-base - update to 6.4.0-150600.23.60.5.150600.12.26.4
kernel-default-base-rebuild - update to 6.4.0-150600.23.60.5.150600.12.26.4
kernel - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
bpftool - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
bpftool-debuginfo - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-debuginfo - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-debugsource - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-devel - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-headers - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-tools - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-tools-debuginfo - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-tools-devel - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
perf - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
perf-debuginfo - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
python3-perf - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
python3-perf-debuginfo - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-source - addressed in versions 6.6.0-107.0.0.99, 6.6.0-107.0.0.110, 6.6.0-107.0.0.113
kernel-extra-modules - update to 6.6.0-107.0.0.113
linux-hwe-6.8 (Ubuntu package) - addressed in versions 6.8.0-84.84~22.04.1, 6.8.0-85.85~22.04.1
linux-azure-nvidia (Ubuntu package) - update to 6.8.0-1025.27
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1037.37, 6.8.0-1037.37~22.04.1
linux-oracle (Ubuntu package) - update to 6.8.0-1037.38
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1037.38~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1039.41~22.04.1, 6.8.0-1040.42~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1039.42, 6.8.0-1039.42.1, 6.8.0-1039.42~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2031.32
linux-realtime (Ubuntu package) - update to 6.8.1-1034.35
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1034.35~22.04.1
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1015.16, 6.11.0-1015.16~24.04.2
linux-oem-6.11 (Ubuntu package) - update to 6.11.0-1024.24

External References

Related Security Bulletins