Use-after-free in Linux kernel - CVE-2026-23216

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Main Vulnerability Database Vulnerabilities #VU123039

Use-after-free in Linux kernel - CVE-2026-23216

Published: February 18, 2026


Vulnerability identifier: #VU123039
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-23216
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the iscsit_dec_conn_usage_count() function in drivers/target/iscsi/iscsi_target_util.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Real Time
Anolis OS
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
SUSE Linux Enterprise Live Patching
Development Tools Module
Basesystem Module
SUSE Real Time Module
Legacy Module
Public Cloud Module
openEuler
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kgraft-patch-4_12_14-122_310-default
kernel-livepatch-SLE15-SP7-RT_Update_11-debugsource
kernel-livepatch-6_4_0-150700_7_37-rt
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo
kernel-livepatch-6_4_0-150700_53_37-default
kernel-livepatch-SLE15-SP7_Update_11-debugsource
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-default-base-debuginfo
ocfs2-kmp-default-debuginfo
kernel-macros
kernel-devel
kernel-source
kernel-default
kernel-default-debuginfo
gfs2-kmp-default-debuginfo
kernel-default-man
kernel-default-devel-debuginfo
kernel-default-kgraft
cluster-md-kmp-default
kernel-default-kgraft-devel
ocfs2-kmp-default
dlm-kmp-default
kernel-default-debugsource
kernel-default-base
kernel-default-devel
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
gfs2-kmp-default
kernel-syms
kernel
bpftool
kernel-core
kernel-cross-headers
python3-perf
kernel-debug
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-modules
kernel-headers
kernel-doc
kernel-abi-stablelists
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-modules-extra
bpftool-debuginfo
kernel-debuginfo
perf-debuginfo
kernel-debugsource
kernel-tools-debuginfo
kernel-tools-devel
python2-perf
python2-perf-debuginfo
python3-perf-debuginfo
linux (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-raspi (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux (Debian package)
kernel-syms-rt
kernel-devel-rt
kernel-rt
kernel-source-rt
gfs2-kmp-rt-debuginfo
kernel-rt-debuginfo
gfs2-kmp-rt
cluster-md-kmp-rt
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt-devel
kernel-rt-devel-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-debugsource
dlm-kmp-rt-debuginfo
dlm-kmp-rt
kernel-obs-build
kernel-docs
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb
kernel-default-livepatch-devel
kernel-azure-devel
kernel-obs-build-debugsource
kernel-default-extra-debuginfo
kernel-azure-debugsource
kernel-default-livepatch
kernel-default-extra
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-azure
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-extra-modules
linux-fips (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-6.8 (Ubuntu package)
linux-azure (Ubuntu package)

How to mitigate CVE-2026-23216

Install update from vendor's repository.

kgraft-patch-4_12_14-122_310-default - update to 1-8.3.1
kernel-livepatch-SLE15-SP7-RT_Update_11-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_37-rt - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_37-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_11-debugsource - update to 1-150700.15.3.1
kernel (Red Hat package) - addressed in versions 3.10.0-1160.148.1.el7, 4.18.0-305.194.1.el8_4, 4.18.0-372.195.1.el8_6, 4.18.0-477.145.1.el8_8, 4.18.0-553.139.1.el8_10, 5.14.0-284.176.1.el9_2, 5.14.0-687.15.1.el9_8
kernel-rt (Red Hat package) - addressed in versions 3.10.0-1160.148.1.rt56.1300.el7, 4.18.0-553.139.1.rt7.480.el8_10, 5.14.0-284.176.1.rt14.461.el9_2
kernel-default-base-debuginfo - update to 4.12.14-122.310.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-macros - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-devel - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-source - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-default - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-default-man - update to 4.12.14-122.310.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-default-kgraft - update to 4.12.14-122.310.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-default-kgraft-devel - update to 4.12.14-122.310.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
dlm-kmp-default - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-default-debugsource - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-default-base - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1.150700.17.25.1
kernel-default-devel - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
gfs2-kmp-default - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel-syms - addressed in versions 4.12.14-122.310.1, 6.4.0-150700.53.37.1
kernel - update to 4.18.0-553.139.1.0.1
bpftool - update to 4.18.0-553.139.1.0.1
kernel-core - update to 4.18.0-553.139.1.0.1
kernel-cross-headers - update to 4.18.0-553.139.1.0.1
python3-perf - update to 4.18.0-553.139.1.0.1
kernel-debug - update to 4.18.0-553.139.1.0.1
kernel-debug-core - update to 4.18.0-553.139.1.0.1
kernel-debug-devel - update to 4.18.0-553.139.1.0.1
kernel-debug-modules - update to 4.18.0-553.139.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.139.1.0.1
kernel-devel - update to 4.18.0-553.139.1.0.1
kernel-modules - update to 4.18.0-553.139.1.0.1
kernel-headers - update to 4.18.0-553.139.1.0.1
kernel-doc - update to 4.18.0-553.139.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.139.1.0.1
perf - update to 4.18.0-553.139.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.139.1.0.1
kernel-tools-libs - update to 4.18.0-553.139.1.0.1
kernel-tools - update to 4.18.0-553.139.1.0.1
kernel-modules-extra - update to 4.18.0-553.139.1.0.1
kernel - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
bpftool - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
bpftool-debuginfo - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-debuginfo - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
perf-debuginfo - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-debugsource - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-devel - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-source - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-tools - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-tools-debuginfo - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-tools-devel - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
perf - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
python2-perf - update to 4.19.90-2603.1.0.0364
python2-perf-debuginfo - update to 4.19.90-2603.1.0.0364
python3-perf - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
python3-perf-debuginfo - addressed in versions 4.19.90-2603.1.0.0364, 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
kernel-headers - addressed in versions 5.10.0-303.0.0.206, 6.6.0-142.0.0.124, 6.6.0-142.0.0.136, 6.6.0-142.0.0.137
linux (Ubuntu package) - addressed in versions 5.15.0.183.154, 5.15.0-183.193, 5.15.0-183.193~20.04.1, 5.15.0.185.108, 5.15.0.185.166, 5.15.0-185.195+fips1, 5.15.0-185.195~20.04.1, 5.15.0-1052.52, 5.15.0.1052.54, 5.15.0-1063.63, 5.15.0-1063.63~20.04.1, 5.15.0.1094.93, 5.15.0-1094.102, 5.15.0.1103.99, 5.15.0-1103.105, 5.15.0.1103.107, 5.15.0-1103.108, 5.15.0.1105.102, 5.15.0.1105.109, 5.15.0-1105.109~20.04.1, 5.15.0.1106.105, 5.15.0.1106.106, 5.15.0-1106.107, 5.15.0-1106.112, 5.15.0.1107.106, 5.15.0-1107.113, 5.15.0.1108.104, 5.15.0-1108.114, 5.15.0.1110.114, 5.15.0-1110.119, 5.15.0.1111.101, 5.15.0.1111.107, 5.15.0.1111.108, 5.15.0.1111.114, 5.15.0-1111.118, 5.15.0-1111.118+fips1, 5.15.0-1111.118~20.04.1, 5.15.0-1111.121, 5.15.0-1111.121+fips1, 5.15.0.1116.114, 5.15.0-1116.125, 5.15.0-1116.125~20.04.1, 6.8.0-117.117, 6.8.0-117.117.1, 6.8.0-117.117.1~22.04.1, 6.8.0-1041.44, 6.8.0-1054.60, 6.8.0-1055.56, 6.8.0-1055.56~22.04.1, 6.8.0-1055.58+fips1, 6.8.0-1056.60, 6.8.0-1058.61, 6.8.0-1058.61+fips1, 6.8.0-2045.46, 6.8.1-1051.52, 6.8.1-1051.52~22.04.1
linux-xilinx-zynqmp (Ubuntu package) - addressed in versions 5.15.0.1074.77, 5.15.0-1074.78
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1105.103, 5.15.0-1105.108
linux-gcp-5.15 (Ubuntu package) - addressed in versions 5.15.0-1106.112~20.04.1, 5.15.0-1111.121~20.04.1
linux-oracle-5.15 (Ubuntu package) - update to 5.15.0-1108.114~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1116.101, 5.15.0-1116.125+fips1
linux (Debian package) - addressed in versions 6.1.164-1, 6.12.73-1
kernel-syms-rt - update to 6.4.0-150700.7.37.1
kernel-devel-rt - update to 6.4.0-150700.7.37.2
kernel-rt - update to 6.4.0-150700.7.37.2
kernel-source-rt - update to 6.4.0-150700.7.37.2
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt-debuginfo - update to 6.4.0-150700.7.37.2
gfs2-kmp-rt - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-rt-devel - update to 6.4.0-150700.7.37.2
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt-debugsource - update to 6.4.0-150700.7.37.2
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
dlm-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-obs-build - update to 6.4.0-150700.53.37.1
kernel-docs - update to 6.4.0-150700.53.37.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.37.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.37.1
kernel-zfcpdump - update to 6.4.0-150700.53.37.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.37.1
kernel-64kb-devel - update to 6.4.0-150700.53.37.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.37.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.37.1
kernel-64kb - update to 6.4.0-150700.53.37.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.37.1
kernel-azure-devel - update to 6.4.0-150700.53.37.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.37.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure-debugsource - update to 6.4.0-150700.53.37.1
kernel-default-livepatch - update to 6.4.0-150700.53.37.1
kernel-default-extra - update to 6.4.0-150700.53.37.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure - update to 6.4.0-150700.53.37.1
reiserfs-kmp-default - update to 6.4.0-150700.53.37.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.37.1
kernel-extra-modules - update to 6.6.0-142.0.0.137
linux-fips (Ubuntu package) - update to 6.8.0-116.116+fips1
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1024.24
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1054.57, 6.8.0-1054.57.1
linux-nvidia-6.8 (Ubuntu package) - update to 6.8.0-1054.57~22.04.1
linux-azure (Ubuntu package) - update to 6.8.0-1056.62

External References

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