Use-after-free in Linux kernel - CVE-2026-43116

Vulnerability identifier: #VU130643

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-2026-43116

CWE-ID: CWE-416

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 a use-after-free in netfilter ctnetlink expectation handling when processing expectation add, delete, get, or event operations. A local user can trigger access to an invalid master conntrack object to cause a denial of service.

Linux kernel
Debian Linux
Anolis OS
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel-rt (Red Hat package)
kernel (Red Hat package)
kernel-tools-libs
kernel-doc
bpftool
kernel
kernel-core
kernel-cross-headers
kernel-abi-stablelists
python3-perf
perf
kernel-debug
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs-devel
python3-perf-debuginfo
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-source
kernel-tools-debuginfo
kernel-tools-devel
perf-debuginfo
kernel-extra-modules
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-rt (Red Hat package) - addressed in versions 3.10.0-1160.159.1.rt56.1311.el7, 4.18.0-553.150.1.rt7.491.el8_10, 5.14.0-284.176.1.rt14.461.el9_2
kernel (Red Hat package) - addressed in versions 4.18.0-305.194.1.el8_4, 4.18.0-372.196.1.el8_6, 4.18.0-477.147.1.el8_8, 4.18.0-553.150.1.el8_10, 5.14.0-284.176.1.el9_2, 5.14.0-687.15.1.el9_8
kernel-tools-libs - update to 4.18.0-553.150.1.0.1
kernel-doc - update to 4.18.0-553.150.1.0.1
bpftool - update to 4.18.0-553.150.1.0.1
kernel - update to 4.18.0-553.150.1.0.1
kernel-core - update to 4.18.0-553.150.1.0.1
kernel-cross-headers - update to 4.18.0-553.150.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.150.1.0.1
python3-perf - update to 4.18.0-553.150.1.0.1
perf - update to 4.18.0-553.150.1.0.1
kernel-debug - update to 4.18.0-553.150.1.0.1
kernel-debug-core - update to 4.18.0-553.150.1.0.1
kernel-debug-devel - update to 4.18.0-553.150.1.0.1
kernel-debug-modules - update to 4.18.0-553.150.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.150.1.0.1
kernel-devel - update to 4.18.0-553.150.1.0.1
kernel-headers - update to 4.18.0-553.150.1.0.1
kernel-modules - update to 4.18.0-553.150.1.0.1
kernel-modules-extra - update to 4.18.0-553.150.1.0.1
kernel-tools - update to 4.18.0-553.150.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.150.1.0.1
kernel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
python3-perf-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
bpftool - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
bpftool-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-debugsource - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-devel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-headers - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-source - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-tools - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-tools-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-tools-devel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
perf - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
perf-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
python3-perf - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-extra-modules - update to 6.6.0-145.3.17.150
linux (Debian package) - update to 6.12.94-1

• https://git.kernel.org/stable/c/497f99b26fffdc5635706d1b4811f1ed8ee21a5b
• https://git.kernel.org/stable/c/bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5
• https://git.kernel.org/stable/c/f338ced0473849c9f6ed0b77ca99f1aab5826787

• Use-after-free in Linux kernel netfilter
• Red Hat Enterprise Linux 9 update for kernel
• openEuler 22.03 LTS SP4 update for kernel
• Red Hat Enterprise Linux 9 update for kernel-rt
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Debian update for linux
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Anolis OS update for kernel:4.18
• Red Hat Enterprise Linux 7 Extended Lifecycle Support update for kernel-rt