Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
If nf_conntrack_init_start() fails (for example due to a
register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini()
clean-up path frees the nf_ct_helper_hash map.
When built with NF_CONNTRACK=y, further netfilter modules (e.g:
netfilter_conntrack_ftp) can still be loaded and call
nf_conntrack_helpers_register(), independently of whether nf_conntrack
initialized correctly. This accesses the nf_ct_helper_hash dangling
pointer and causes a uaf, possibly leading to random memory corruption.
This patch guards nf_conntrack_helper_register() from accessing a freed
or uninitialized nf_ct_helper_hash pointer and fixes possible
uses-after-free when loading a conntrack module.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 3.6 | 4.14.322 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.4.4-1 | — |
| Debian 13 | linux | 6.4.4-1 | — |
| Debian 12 | linux | 6.1.52-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1027.29 | — |
| Ubuntu 24.04 LTS | linux-intel +9 | No fix yet | — |
| Ubuntu 22.04 LTS | linux | 5.15.0-86.96 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1047.52 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1049.56 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1049.56.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1044.52 | — |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1044.49 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1030.35 | — |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1040.43 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1043.49 | — |
| Ubuntu 22.04 LTS | linux-lowlatency | 5.15.0-86.95 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1037.37 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1018.18 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1005.5 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1045.51 | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-166.183 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1113.123 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1047.52~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1119.126 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1049.56~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1074.80 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1117.126 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1044.52~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 | 5.15.0-86.96~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1060.65 | — |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1040.43~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1043.49~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1025.26 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1102.108 | — |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-86.95~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1018.18~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1112.121 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1045.51~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1097.109 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1043.47~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1033.37 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1040.42 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1048.54 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1113.123+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1119.126+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1088.97 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1117.126+fips1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux +5 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1113.123~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1119.126~18.04.2 | — |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1117.126~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-166.183~18.04.2 | — |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1060.65~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1112.121~18.04.4 | — |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1097.109~18.04.2 | — |
| Ubuntu Pro 16.04 LTS | linux +7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux +3 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | kernel-64kb +6 | 6.4.0-150700.53.22.1 | SUSE-SU-2025:4057-1 |
| SLES 15 SP7 | kernel-azure +2 | 6.4.0-150700.20.18.1 | SUSE-SU-2025:4132-1 |
| SLES 15 SP7 | kernel-default-base | 6.4.0-150700.53.22.1.150700.17.15.1 | SUSE-SU-2025:4057-1 |
| SLES 15 SP6 | kernel-64kb +6 | 6.4.0-150600.23.78.1 | SUSE-SU-2025:4140-1 |
| SLES 15 SP6 | kernel-azure +2 | 6.4.0-150600.8.55.1 | SUSE-SU-2025:4128-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.78.1.150600.12.34.2 | SUSE-SU-2025:4140-1 |
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.127.1 | SUSE-SU-2025:4320-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.127.1.150500.6.61.1 | SUSE-SU-2025:4320-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 | SUSE-SU-2025:4111-1 |
| SLES 15 SP3 | kernel-64kb +5 | 5.3.18-150300.59.226.2 | SUSE-SU-2025:4188-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.226.2.150300.18.134.2 | SUSE-SU-2025:4188-1 |
| SLES 15 SP3 | kernel-docs | 5.3.18-150300.59.226.3 | SUSE-SU-2025:4188-1 |
| SLES 15 SP3 | kernel-syms | 5.3.18-150300.59.226.1 | SUSE-SU-2025:4188-1 |
Show 24 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | kernel-syms +2 | 4.12.14-122.280.1 | SUSE-SU-2025:4189-1 |
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.127.1.150500.6.61.1 | SUSE-SU-2025:4320-1 |
| SLES for SAP 15 SP5 | kernel-docs +4 | 5.14.21-150500.55.127.1 | SUSE-SU-2025:4320-1 |
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 | SUSE-SU-2025:4111-1 |
| SLES for SAP 15 SP4 | kernel-docs +4 | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SLES for SAP 15 SP3 | kernel-default-base | 5.3.18-150300.59.226.2.150300.18.134.2 | SUSE-SU-2025:4188-1 |
| SLES for SAP 15 SP3 | kernel-docs | 5.3.18-150300.59.226.3 | SUSE-SU-2025:4188-1 |
| SLES for SAP 15 SP3 | kernel-source +3 | 5.3.18-150300.59.226.2 | SUSE-SU-2025:4188-1 |
| SLES for SAP 15 SP3 | kernel-syms | 5.3.18-150300.59.226.1 | SUSE-SU-2025:4188-1 |
| SLE Micro 6.1 | kernel-default-base | 6.4.0-36.1.21.13 | SUSE-SU-2025:21056-1 |
| SLE Micro 6.1 | kernel-rt +1 | 6.4.0-38.1 | SUSE-SU-2025:21064-1 |
| SLE Micro 6.1 | kernel-source +2 | 6.4.0-36.1 | SUSE-SU-2025:21056-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-36.1.21.13 | SUSE-SU-2025:21040-1 |
| SLE Micro 6.0 | kernel-rt +1 | 6.4.0-38.1 | SUSE-SU-2025:21052-1 |
| SLE Micro 6.0 | kernel-source +2 | 6.4.0-36.1 | SUSE-SU-2025:21040-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.127.1.150500.6.61.1 | SUSE-SU-2025:4320-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.112.1 | SUSE-SU-2025:4149-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.127.1 | SUSE-SU-2025:4320-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 | SUSE-SU-2025:4111-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.136.1 | SUSE-SU-2025:4139-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 | SUSE-SU-2025:4111-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.136.1 | SUSE-SU-2025:4139-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.226.2 | SUSE-SU-2025:4188-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.226.2.150300.18.134.2 | SUSE-SU-2025:4188-1 |
| SLE Micro 5.2 | kernel-rt +1 | 5.3.18-150300.226.1 | SUSE-SU-2025:4135-1 |
| SLE Live Patching 15 SP7 | kernel-default | 6.4.0-150700.53.22.1 | SUSE-SU-2025:4057-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_6 | 1-150700.1.3.1 | SUSE-SU-2025:4141-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_6 | 1-150700.15.3.1 | SUSE-SU-2025:4057-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.78.1 | SUSE-SU-2025:4140-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_17 | 1-150600.1.3.1 | SUSE-SU-2025:4301-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_17 | 1-150600.13.5.1 | SUSE-SU-2025:4140-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.127.1 | SUSE-SU-2025:4320-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_32 | 1-150500.11.3.1 | SUSE-SU-2025:4320-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_46 | 1-150400.9.5.1 | SUSE-SU-2025:4111-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.226.2 | SUSE-SU-2025:4188-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_63 | 1-150300.7.5.2 | SUSE-SU-2025:4188-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.280.1 | SUSE-SU-2025:4189-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_74 | 1-8.5.1 | SUSE-SU-2025:4189-1 |
| SLE HPC 15 SP5 | kernel-64kb +5 | 5.14.21-150500.55.127.1 | SUSE-SU-2025:4320-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.127.1.150500.6.61.1 | SUSE-SU-2025:4320-1 |
| SLE HPC 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 | SUSE-SU-2025:4111-1 |
| SLE HPC 15 SP3 | kernel-64kb +4 | 5.3.18-150300.59.226.2 | SUSE-SU-2025:4188-1 |
| SLE HPC 15 SP3 | kernel-default-base | 5.3.18-150300.59.226.2.150300.18.134.2 | SUSE-SU-2025:4188-1 |
| SLE HPC 15 SP3 | kernel-docs | 5.3.18-150300.59.226.3 | SUSE-SU-2025:4188-1 |
| SLE HPC 15 SP3 | kernel-syms | 5.3.18-150300.59.226.1 | SUSE-SU-2025:4188-1 |
| SUSE Real Time Module 15 SP7 | kernel-rt +2 | 6.4.0-150700.7.22.1 | SUSE-SU-2025:4141-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.58.1 | SUSE-SU-2025:4301-1 |
| SUSE Manager Server LTS 4.3 | kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 | SUSE-SU-2025:4111-1 |
| SUSE Manager Server LTS 4.3 | kernel-syms +3 | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SUSE Manager Proxy LTS 4.3 | kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 | SUSE-SU-2025:4111-1 |
| SUSE Manager Proxy LTS 4.3 | kernel-syms +2 | 5.14.21-150400.24.184.1 | SUSE-SU-2025:4111-1 |
| SUSE Enterprise Storage 7.1 | kernel-64kb +4 | 5.3.18-150300.59.226.2 | SUSE-SU-2025:4188-1 |
| SUSE Enterprise Storage 7.1 | kernel-default-base | 5.3.18-150300.59.226.2.150300.18.134.2 | SUSE-SU-2025:4188-1 |
| SUSE Enterprise Storage 7.1 | kernel-docs | 5.3.18-150300.59.226.3 | SUSE-SU-2025:4188-1 |
| SUSE Enterprise Storage 7.1 | kernel-syms | 5.3.18-150300.59.226.1 | SUSE-SU-2025:4188-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +10 | 6.4.0-150600.23.78.1 | SUSE-SU-2025:4140-1 |
| openSUSE Leap 15.6 | kernel-azure +2 | 6.4.0-150600.8.55.1 | SUSE-SU-2025:4128-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.78.1.150600.12.34.2 | SUSE-SU-2025:4140-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.58.1 | SUSE-SU-2025:4301-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.41-63.109 | 1.0-0.amzn2023 | ALAS2023-2023-299 |
| Amazon Linux 2023 | perf +12 | 6.1.41-63.109.amzn2023 | ALAS2023-2023-299 |
| Amazon Linux 2 | kernel-livepatch-4.14.322-244.536 | 1.0-0.amzn2 | ALAS2-2023-2268 |
| Amazon Linux 2 | perf +8 | 4.14.322-244.536.amzn2 | ALAS2-2023-2268 |
Advisories 21
- WID-SEC-2025-2229 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- WID-SEC-2026-0349 Dell Avamar und NetWorker: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- SUSE-SU-2025:4139-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4140-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4149-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4189-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21056-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4141-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4111-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4188-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21040-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21052-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21064-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- ALAS2023-2023-299 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 11, 2026
- ALAS2-2023-2268 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 8, 2026
- SUSE-SU-2025:4135-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4128-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4320-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4132-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4057-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4301-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7
- https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0
- https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9
- https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175
- https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566
- https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034
- https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7
- https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b