Description
An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.
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 | No fix yet | — |
| Debian 13 | linux | No fix yet | — |
| Debian 12 | linux | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-73.82 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1048.50 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1047.49 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1043.46 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1043.45 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1015.16 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1039.40 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1045.49 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1035.38 | — |
| Ubuntu 20.04 LTS | linux-riscv +23 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-143.147 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1102.109 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1048.50~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1114.127 | — |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1047.49~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1018.22 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1099.112 | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1043.46~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-73.82~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1091.93 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1071.79 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1044.47~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1035.38~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1085.90 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1102.111 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2044.46 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2026.29 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1059.67 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1072.78 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-222.255 | — |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1138.152 | — |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1102.109~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1114.127~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1099.112~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-143.147~16.04.3 | — |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1103.112 | — |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1071.79~16.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1102.107 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1114.127~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-222.255~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-305.rt7.72.el8 | RHSA-2021:1739 |
| RHEL 8 | perf +26 | 4.18.0-305.el8 | RHSA-2021:1578 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-150200.24.154.1.150200.9.75.1 | SUSE-SU-2023:2651-1 |
| SLES 15 SP2 | kernel-docs | 5.3.18-150200.24.154.2 | SUSE-SU-2023:2651-1 |
| SLES 15 SP2 | kernel-syms +4 | 5.3.18-150200.24.154.1 | SUSE-SU-2023:2651-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP3 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SLES for SAP 15 SP3 | kernel-docs +5 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SLES for SAP 15 SP2 | kernel-default-base | 5.3.18-150200.24.154.1.150200.9.75.1 | SUSE-SU-2023:2651-1 |
| SLES for SAP 15 SP2 | kernel-docs | 5.3.18-150200.24.154.2 | SUSE-SU-2023:2651-1 |
| SLES for SAP 15 SP2 | kernel-syms +4 | 5.3.18-150200.24.154.1 | SUSE-SU-2023:2651-1 |
| SLE Real Time 15 SP3 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SLE Real Time 15 SP3 | kernel-docs +5 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SLE Micro 5.2 | kernel-rt | 5.3.18-150300.130.1 | SUSE-SU-2023:2502-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-150300.130.1 | SUSE-SU-2023:2502-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_33 | 1-150300.7.3.1 | SUSE-SU-2023:2611-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-150200.24.154.1 | SUSE-SU-2023:2651-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_37 | 1-150200.5.3.1 | SUSE-SU-2023:2651-1 |
| SLE HPC 15 SP3 | kernel-64kb +6 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SLE HPC 15 SP3 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SLE HPC 15 SP2 | kernel-default-base | 5.3.18-150200.24.154.1.150200.9.75.1 | SUSE-SU-2023:2651-1 |
| SLE HPC 15 SP2 | kernel-docs | 5.3.18-150200.24.154.2 | SUSE-SU-2023:2651-1 |
| SLE HPC 15 SP2 | kernel-syms +4 | 5.3.18-150200.24.154.1 | SUSE-SU-2023:2651-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +3 | 5.3.18-150300.130.1 | SUSE-SU-2023:2502-1 |
| SUSE Manager Server 4.2 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SUSE Manager Server 4.2 | kernel-source +3 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SUSE Manager Proxy 4.2 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SUSE Manager Proxy 4.2 | kernel-source +2 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SUSE Enterprise Storage 7.1 | kernel-64kb +6 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
| SUSE Enterprise Storage 7.1 | kernel-default-base | 5.3.18-150300.59.124.1.150300.18.72.1 | SUSE-SU-2023:2611-1 |
| SUSE Enterprise Storage 7 | kernel-default-base | 5.3.18-150200.24.154.1.150200.9.75.1 | SUSE-SU-2023:2651-1 |
| SUSE Enterprise Storage 7 | kernel-docs | 5.3.18-150200.24.154.2 | SUSE-SU-2023:2651-1 |
| SUSE Enterprise Storage 7 | kernel-syms +4 | 5.3.18-150200.24.154.1 | SUSE-SU-2023:2651-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | dtb-aarch64 | 5.3.18-150300.59.124.1 | SUSE-SU-2023:2611-1 |
Advisories 6
- RHSA-2021:1739 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2021:1578 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- SUSE-SU-2023:2502-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2611-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2651-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1267 Linux Kernel: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jun 27, 2023
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5c
- https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12
- https://security.netapp.com/advisory/ntap-20230622-0005/