In the Linux kernel, the following vulnerability has been resolved:
net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
As Paolo said earlier [1]:
"Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet."
act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact).
[1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/[email protected]/
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-rt-64k-debug-modulesUpgrade kernel-debug-develUpgrade python3-perfUpgrade kernel-devel-matchedUpgrade kernel-64k-coreUpgrade kernel-debug-coreUpgrade kernel-debug-modules-coreUpgrade kernel-64k-debug-develUpgrade kernel-rt-coreUpgrade kernel-rt-64k-debug-modules-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-debug-modulesUpgrade kernel-modules-coreUpgrade kernel-64k-modules-coreUpgrade kernel-rt-debugUpgrade kernel-modules-extraUpgrade kernel-coreUpgrade kernel-rt-64k-coreUpgrade kernel-cross-headersUpgrade kernel-debug-uki-virtUpgrade kernel-rt-64k-debugUpgrade rtlaUpgrade kernel-rt-debug-modules-extraUpgrade libperfUpgrade kernel-uki-virtUpgrade kernel-docUpgrade kernel-zfcpdumpUpgrade kernel-rt-debug-develUpgrade kernel-headersUpgrade kernel-rt-64k-debug-modules-extraUpgrade kernel-modulesUpgrade kernel-zfcpdump-develUpgrade kernel-64k-develUpgrade kernel-develUpgrade kernel-64k-modulesUpgrade kernel-debugUpgrade kernelUpgrade kernel-rt-64kUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-rt-64k-modules-coreUpgrade kernel-64k-debug-modulesUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-64kUpgrade kernel-tools-libsUpgrade kernel-64k-debug-modules-coreUpgrade perfUpgrade kernel-64k-devel-matchedUpgrade kernel-rt-64k-develUpgrade kernel-uki-virt-addonsUpgrade kernel-zfcpdump-coreUpgrade kernel-rtUpgrade kernel-64k-modules-extraUpgrade kernel-rt-64k-debug-develUpgrade kernel-zfcpdump-modulesUpgrade rvUpgrade kernel-rt-64k-modules-extraUpgrade kernel-rt-modules-extraUpgrade kernel-tools-libs-develUpgrade kernel-abi-stablelistsUpgrade kernel-rt-modules-coreUpgrade kernel-rt-64k-modulesUpgrade kernel-debug-devel-matchedUpgrade kernel-64k-debug-coreUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-rt-develUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-debug-modules-extraUpgrade kernel-64k-debug-modules-extraUpgrade kernel-rt-64k-debug-coreUpgrade kernel-debug-modulesUpgrade kernel-rt-modulesUpgrade kernel-64k-debugUpgrade kernel-rt-debug-modules-coreUpgrade kernel-rt-debug-core | May 7, 2026 | May 4, 2026 |
| Amazon Linux Ami 2 | — | Upgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.204-143.230Upgrade kernel-headersUpgrade kernelUpgrade python-perf-debuginfoUpgrade python-perfUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade perfUpgrade kernel-toolsUpgrade kernel-tools-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-livepatch-6.1.168-202.320Upgrade kernel6.12-libbpfUpgrade kernel-develUpgrade kernel6.18Upgrade kernel6.18-develUpgrade kernel-libbpf-develUpgrade perf6.18Upgrade kernel6.18-libbpf-staticUpgrade bpftoolUpgrade kernelUpgrade kernel6.12-develUpgrade kernel-tools-develUpgrade kernel6.18-tools-develUpgrade kernel6.18-libbpf-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel-tools-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade perf6.12-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel6.12-libbpf-staticUpgrade kernel-modules-extra-commonUpgrade python3-perf6.12-debuginfoUpgrade bpftool-debuginfoUpgrade kernel6.18-modules-extra-commonUpgrade kernel6.12-tools-debuginfoUpgrade kernel-libbpf-debuginfoUpgrade python3-perfUpgrade bpftool6.18Upgrade perfUpgrade python3-perf-debuginfoUpgrade kernel6.18-toolsUpgrade kernel-toolsUpgrade kernel6.18-libbpfUpgrade kernel6.12-headersUpgrade kernel6.12-debuginfo-common-aarch64Upgrade perf6.18-debuginfoUpgrade kernel6.12-libbpf-develUpgrade kernel6.18-headersUpgrade perf-debuginfoUpgrade python3-perf6.18Upgrade kernel6.12-debuginfoUpgrade kernel-livepatch-6.12.77-99.140Upgrade kernel6.18-modules-extraUpgrade kernel6.12-toolsUpgrade kernel-libbpfUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-libbpf-develUpgrade perf6.12Upgrade kernel6.12-tools-develUpgrade kernel6.12-modules-extra-commonUpgrade kernel-livepatch-6.18.20-20.229Upgrade bpftool6.12-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.12-modules-extraUpgrade kernel6.12-libbpf-debuginfoUpgrade kernel6.12Upgrade kernel-debuginfoUpgrade python3-perf6.12Upgrade bpftool6.12Upgrade kernel6.18-debuginfoUpgrade kernel-modules-extraUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool6.18-debuginfoUpgrade python3-perf6.18-debuginfo | Apr 9, 2026 | Mar 18, 2026 |
| Debian | — | Upgrade linux-6.1Upgrade linux | May 3, 2026 | May 3, 2026 |
| Oracle_linux | — | Upgrade kernelUpgrade kernel-uek | May 7, 2026 | Mar 18, 2026 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | May 6, 2026 | Mar 18, 2026 |
| Rocky_linux | — | Upgrade kernel-rt-modules-coreUpgrade kernel-rt-debug-modules-extraUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-debug-modules-coreUpgrade kernel-toolsUpgrade libperfUpgrade kernel-zfcpdumpUpgrade kernel-rt-modules-extraUpgrade kernel-debug-modulesUpgrade kernel-uki-virt-addonsUpgrade kernel-rt-kvmUpgrade kernel-rt-modulesUpgrade kernel-debug-devel-matchedUpgrade kernel-zfcpdump-modulesUpgrade kernel-debug-debuginfoUpgrade kernel-debuginfo-common-s390xUpgrade kernel-devel-matchedUpgrade kernel-tools-libs-develUpgrade libperf-debuginfoUpgrade kernel-rtUpgrade rvUpgrade kernel-debug-modules-extraUpgrade kernel-rt-debuginfoUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debug-modules-coreUpgrade kernel-debug-coreUpgrade kernel-rt-debug-develUpgrade kernel-coreUpgrade kernel-debugUpgrade perfUpgrade kernel-debuginfoUpgrade kernel-modules-extraUpgrade kernelUpgrade kernel-rt-debug-coreUpgrade kernel-modules-extra-matchedUpgrade python3-perfUpgrade kernel-modules-coreUpgrade kernel-debug-develUpgrade rtlaUpgrade bpftoolUpgrade kernel-rt-coreUpgrade kernel-develUpgrade kernel-rt-develUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-rt-debugUpgrade kernel-modulesUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-zfcpdump-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-debug-uki-virtUpgrade perf-debuginfoUpgrade kernel-uki-virtUpgrade kernel-tools-libsUpgrade kernel-rt-debug-kvmUpgrade kernel-tools-debuginfoUpgrade kernel-zfcpdump-develUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-debug-debuginfo | May 11, 2026 | May 6, 2026 |
| Ubuntu | — | Upgrade linux-image-gkeop-6.8Upgrade linux-image-oem-22.04bUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-5.15.0-1053-nvidia-tegra-igxUpgrade linux-image-5.15.0-1109-oracleUpgrade linux-image-kvmUpgrade linux-image-generic-64kUpgrade linux-image-azure-lts-22.04Upgrade linux-image-intel-iotgUpgrade linux-image-aws-64kUpgrade linux-image-5.15.0-186-generic-lpaeUpgrade linux-image-6.8.0-1033-xilinxUpgrade linux-image-5.15.0-1107-nvidiaUpgrade linux-image-6.8.0-1058-oracle-64kUpgrade linux-image-oem-20.04cUpgrade linux-image-oem-20.04dUpgrade linux-image-5.15.0-1107-intel-iotgUpgrade linux-image-6.8.0-1064-gcp-fipsUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-aws-fips-6.8Upgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-nvidiaUpgrade linux-image-oem-20.04bUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-5.15.0-1064-nvidia-tegra-rtUpgrade linux-image-nvidia-tegraUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-genericUpgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-6.8.0-1063-azureUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-oracle-lts-22.04Upgrade linux-image-5.15.0-1112-aws-64kUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-5.15.0-184-lowlatency-64kUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-6.8.0-2050-raspi-realtimeUpgrade linux-image-6.8.0-1030-nvidia-tegraUpgrade linux-image-xilinxUpgrade linux-image-virtualUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-ibm-6.8Upgrade linux-image-5.15.0-1053-nvidia-tegra-igx-rtUpgrade linux-image-5.15.0-184-lowlatencyUpgrade linux-image-aws-lts-24.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-1059-gkeUpgrade linux-image-6.8.0-1059-nvidia-lowlatency-64kUpgrade linux-image-5.15.0-186-genericUpgrade linux-image-6.8.0-1061-raspiUpgrade linux-image-5.15.0-1112-aws-fipsUpgrade linux-image-6.8.0-1059-nvidia-lowlatencyUpgrade linux-image-6.8.0-1059-nvidia-64kUpgrade linux-image-azure-fde-6.8Upgrade linux-image-gke-6.8Upgrade linux-image-kvm-5.15Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-nvidia-64kUpgrade linux-image-generic-6.8Upgrade linux-image-fips-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-gkeUpgrade linux-image-5.15.0-1095-gkeopUpgrade linux-image-5.15.0-1064-nvidia-tegraUpgrade linux-image-6.8.0-136-lowlatency-64kUpgrade linux-image-5.15.0-1075-xilinx-zynqmpUpgrade linux-image-6.8.0-1061-aws-fipsUpgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-fips-5.15Upgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-oracleUpgrade linux-image-oracle-64kUpgrade linux-image-realtimeUpgrade linux-image-realtime-5.15Upgrade linux-image-nvidia-tegra-5.15Upgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-136-genericUpgrade linux-image-gcpUpgrade linux-image-lowlatencyUpgrade linux-image-intelUpgrade linux-image-aws-lts-22.04Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-5.15.0-1106-raspiUpgrade linux-image-nvidia-5.15Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-oem-20.04Upgrade linux-image-6.8.0-136-lowlatencyUpgrade linux-image-6.8.1-1056-realtimeUpgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-gcp-6.8Upgrade linux-image-generic-lpae-5.15Upgrade linux-image-nvidia-tegra-igx-5.15Upgrade linux-image-aws-5.15Upgrade linux-image-gke-5.15Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-oem-22.04cUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-5.15.0-1111-realtimeUpgrade linux-image-5.15.0-1112-awsUpgrade linux-image-5.15.0-1112-gcpUpgrade linux-image-gkeopUpgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-raspi-nolpaeUpgrade linux-image-intel-iotg-5.15Upgrade linux-image-generic-5.15Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-aws-fipsUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-ibm-5.15Upgrade linux-image-azure-cvmUpgrade linux-image-awsUpgrade linux-image-6.8.0-1061-ibmUpgrade linux-image-5.15.0-1117-azure-fdeUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-gcp-fips-5.15Upgrade linux-image-fipsUpgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-6.8.0-1063-azure-fipsUpgrade linux-image-5.15.0-1117-azureUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-virtual-5.15Upgrade linux-image-raspiUpgrade linux-image-nvidia-6.8Upgrade linux-image-gke-64kUpgrade linux-image-5.15.0-1106-ibmUpgrade linux-image-lowlatency-64kUpgrade linux-image-5.15.0-1108-gkeUpgrade linux-image-6.8.0-1030-nvidia-tegra-rtUpgrade linux-image-5.15.0-1112-gcp-fipsUpgrade linux-image-azure-fde-5.15Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-6.8.0-136-fipsUpgrade linux-image-6.8.0-1061-aws-64kUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-nvidia-tegra-igxUpgrade linux-image-azure-fipsUpgrade linux-image-oem-22.04Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-oracle-6.8Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-ibmUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-gcp-5.15Upgrade linux-image-azureUpgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-6.8.0-1059-nvidiaUpgrade linux-image-gkeop-5.15Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-generic-64k-5.15Upgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-5.15.0-186-fipsUpgrade linux-image-realtime-6.8.1Upgrade linux-image-raspi-6.8Upgrade linux-image-oracle-5.15Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-lowlatency-6.8Upgrade linux-image-gcp-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1059-gke-64kUpgrade linux-image-6.8.0-1046-gkeopUpgrade linux-image-raspi-5.15Upgrade linux-image-virtual-6.8Upgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-laptop-23.10Upgrade linux-image-gke-64k-6.8Upgrade linux-image-aws-fips-5.15Upgrade linux-image-6.8.0-1064-gcp-64kUpgrade linux-image-azure-5.15Upgrade linux-image-6.8.0-1061-awsUpgrade linux-image-6.8.0-1058-oracleUpgrade linux-image-5.15.0-186-generic-64kUpgrade linux-image-5.15.0-1117-azure-fipsUpgrade linux-image-xilinx-6.8Upgrade linux-image-5.15.0-1107-nvidia-lowlatencyUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-azure-lts-24.04Upgrade linux-image-azure-fips-5.15Upgrade linux-image-generic-64k-6.8Upgrade linux-image-aws-64k-5.15Upgrade linux-image-nvidia-tegra-igx-rt-5.15Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1064-gcpUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-lowlatency-5.15Upgrade linux-image-5.15.0-1104-kvmUpgrade linux-image-5.15.0-1104-intel-iot-realtimeUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-nvidia-tegra-rt-5.15 | Jul 20, 2026 | Mar 18, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Mar 18, 2026 |
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