In the Linux kernel, the following vulnerability has been resolved:
flow_dissector: do not dissect PPPoE PFC frames
RFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT RECOMMENDED for PPPoE. In practice, pppd does not support negotiating PFC for PPPoE sessions, and the flow dissector driver has assumed an uncompressed frame until the blamed commit.
During the review process of that commit [1], support for PFC is suggested. However, having a compressed (1-byte) protocol field means the subsequent PPP payload is shifted by one byte, causing 4-byte misalignment for the network header and an unaligned access exception on some architectures.
The exception can be reproduced by sending a PPPoE PFC frame to an ethernet interface of a MIPS board, with RPS enabled, even if no PPPoE session is active on that interface:
$ 0 : 00000000 80c40000 00000000 85144817 $ 4 : 00000008 00000100 80a75758 81dc9bb8 $ 8 : 00000010 8087ae2c 0000003d 00000000 $12 : 000000e0 00000039 00000000 00000000 $16 : 85043240 80a75758 81dc9bb8 00006488 $20 : 0000002f 00000007 85144810 80a70000 $24 : 81d1bda0 00000000 $28 : 81dc8000 81dc9aa8 00000000 805ead08 Hi : 00009d51 Lo : 2163358a epc : 805e91f0 __skb_flow_dissect+0x1b0/0x1b50 ra : 805ead08 __skb_get_hash_net+0x74/0x12c Status: 11000403 KERNEL EXL IE Cause : 40800010 (ExcCode 04) BadVA : 85144817 PrId : 0001992f (MIPS 1004Kc) Call Trace: [<805e91f0>] __skb_flow_dissect+0x1b0/0x1b50 [<805ead08>] __skb_get_hash_net+0x74/0x12c [<805ef330>] get_rps_cpu+0x1b8/0x3fc [<805fca70>] netif_receive_skb_list_internal+0x324/0x364 [<805fd120>] napi_complete_done+0x68/0x2a4 [<8058de5c>] mtk_napi_rx+0x228/0xfec [<805fd398>] __napi_poll+0x3c/0x1c4 [<805fd754>] napi_threaded_poll_loop+0x234/0x29c [<805fd848>] napi_threaded_poll+0x8c/0xb0 [<80053544>] kthread+0x104/0x12c [<80002bd8>] ret_from_kernel_thread+0x14/0x1c
Code: 02d51821 1060045b 00000000 <8c640000> 3084000f 2c820005 144001a2 00042080 8e220000
To reduce the attack surface and maintain performance, do not process PPPoE PFC frames.
[1] https://lore.kernel.org/r/[email protected]
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-toolsUpgrade kernel6.18Upgrade kernel6.18-modules-extraUpgrade kernel-livepatch-6.18.30-61.116Upgrade perf6.18Upgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-tools-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfoUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade python3-perf6.18Upgrade kernel6.18-develUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-tools-develUpgrade bpftool6.18 | Jun 23, 2026 | Jun 8, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 5, 2026 | Jul 5, 2026 |
| Redhat_linux | — | No solution existsUpgrade kernelUpgrade kernel-rt | Jul 17, 2026 | Jun 8, 2026 |
| Rocky_linux | — | Upgrade kernel-debug-debuginfoUpgrade kernel-modules-extraUpgrade kernel-debug-coreUpgrade kernel-debug-modules-coreUpgrade kernel-rt-debuginfoUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-debug-modulesUpgrade kernel-rt-modules-coreUpgrade bpftool-debuginfoUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-debug-develUpgrade kernel-rt-debugUpgrade kernel-rt-debug-modules-coreUpgrade kernel-zfcpdump-develUpgrade kernel-rtUpgrade kernel-modules-extra-matchedUpgrade kernel-tools-libsUpgrade kernel-zfcpdumpUpgrade kernel-tools-debuginfoUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-debug-coreUpgrade kernel-rt-debug-kvmUpgrade kernel-rt-debug-modulesUpgrade python3-perf-debuginfoUpgrade kernel-rt-kvmUpgrade kernel-coreUpgrade kernel-debugUpgrade rvUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-modules-coreUpgrade kernel-modulesUpgrade bpftoolUpgrade kernel-debug-modules-extraUpgrade kernel-debug-devel-matchedUpgrade kernel-uki-virtUpgrade kernel-rt-modulesUpgrade kernel-rt-develUpgrade kernel-uki-virt-addonsUpgrade kernel-toolsUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-zfcpdump-modulesUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo-common-s390xUpgrade libperfUpgrade perf-debuginfoUpgrade kernel-rt-debug-modules-extraUpgrade kernel-devel-matchedUpgrade kernel-debuginfoUpgrade kernel-debug-uki-virtUpgrade kernelUpgrade python3-perfUpgrade kernel-zfcpdump-devel-matchedUpgrade perfUpgrade rtlaUpgrade kernel-rt-coreUpgrade kernel-debug-develUpgrade kernel-tools-libs-develUpgrade libperf-debuginfoUpgrade kernel-develUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-rt-modules-extra | Sep 15, 2026 | Sep 11, 2026 |
| Ubuntu | — | Upgrade linux-image-awsUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-intel-iotgUpgrade linux-image-oem-20.04dUpgrade linux-image-7.0.0-28-realtimeUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-generic-64k-7.0Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-22.04bUpgrade linux-image-oem-24.04aUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-6.8.0-1061-aws-fipsUpgrade linux-image-oem-24.04Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-xilinxUpgrade linux-image-6.8.0-1059-nvidia-64kUpgrade linux-image-6.8.0-1059-nvidia-lowlatencyUpgrade linux-image-6.8.0-1061-raspiUpgrade linux-image-6.8.0-2050-raspi-realtimeUpgrade linux-image-7.0.0-28-realtime-64kUpgrade linux-image-azure-7.0Upgrade linux-image-generic-7.0Upgrade linux-image-gkeUpgrade linux-image-6.8.0-136-lowlatency-64kUpgrade linux-image-7.0.0-1008-gcp-64kUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1059-gkeUpgrade linux-image-6.8.0-136-lowlatencyUpgrade linux-image-oracleUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-azure-6.8Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-gkeopUpgrade linux-image-6.8.0-1059-nvidia-lowlatency-64kUpgrade linux-image-oem-24.04dUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1009-oemUpgrade linux-image-nvidia-64kUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-gkeop-6.8Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-6.8.0-1061-awsUpgrade linux-image-oracle-64kUpgrade linux-image-generic-6.8Upgrade linux-image-6.8.0-1030-nvidia-tegraUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-7.0.0-1010-ibmUpgrade linux-image-azure-fips-6.8Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-realtimeUpgrade linux-image-azure-fde-7.0Upgrade linux-image-realtime-64kUpgrade linux-image-gcpUpgrade linux-image-oem-24.04cUpgrade linux-image-oem-22.04Upgrade linux-image-oem-24.04bUpgrade linux-image-oem-20.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1033-xilinxUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-6.8.0-1064-gcp-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-6.8.0-136-genericUpgrade linux-image-7.0.0-1003-gkeUpgrade linux-image-gcp-6.8Upgrade linux-image-virtualUpgrade linux-image-6.8.1-1056-realtimeUpgrade linux-image-7.0.0-1003-gke-64kUpgrade linux-image-aws-64k-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-7.0.0-1009-awsUpgrade linux-image-aws-fips-6.8Upgrade linux-image-azure-fde-6.8Upgrade linux-image-fips-6.8Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-6.8.0-1064-gcp-fipsUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-oem-20.04cUpgrade linux-image-oem-20.04bUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-6.8.0-1063-azure-fipsUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-1046-gkeopUpgrade linux-image-aws-6.8Upgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-6.8.0-1063-azureUpgrade linux-image-gke-6.8Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-6.8.0-1061-ibmUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-oracle-6.8Upgrade linux-image-oem-26.04aUpgrade linux-image-oem-22.04dUpgrade linux-image-oem-22.04aUpgrade linux-image-ibm-classicUpgrade linux-image-7.0.0-28-generic-64kUpgrade linux-image-6.8.0-1061-aws-64kUpgrade linux-image-gke-64k-6.8Upgrade linux-image-azureUpgrade linux-image-nvidia-7.0Upgrade linux-image-nvidiaUpgrade linux-image-lowlatencyUpgrade linux-image-gke-64k-7.0Upgrade linux-image-aws-fipsUpgrade linux-image-aws-7.0Upgrade linux-image-6.8.0-1058-oracleUpgrade linux-image-virtual-6.8Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-azure-fipsUpgrade linux-image-aws-64k-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-kvmUpgrade linux-image-7.0.0-28-genericUpgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-6.8.0-136-fipsUpgrade linux-image-6.8.0-1030-nvidia-tegra-rtUpgrade linux-image-realtime-7.0Upgrade linux-image-realtime-6.8.1Upgrade linux-image-fipsUpgrade linux-image-xilinx-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-laptop-23.10Upgrade linux-image-ibmUpgrade linux-image-gke-64kUpgrade linux-image-gcp-fipsUpgrade linux-image-raspiUpgrade linux-image-oem-26.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-ibm-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1058-oracle-64kUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-nvidia-bosUpgrade linux-image-6.8.0-1059-gke-64kUpgrade linux-image-6.8.0-1064-gcpUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-nvidia-tegraUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-gke-7.0Upgrade linux-image-generic-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-7.0.0-1008-gcpUpgrade linux-image-oracle-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-azure-lts-24.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-lowlatency-6.8Upgrade linux-image-genericUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-7.0.0-1010-azureUpgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-6.8.0-1059-nvidiaUpgrade linux-image-raspi-6.8Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-gcp-64kUpgrade linux-image-nvidia-64k-7.0 | Jul 20, 2026 | Jun 8, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 27, 2026 | Jun 8, 2026 |
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