In the Linux kernel, the following vulnerability has been resolved:
net/sched: sch_fq: fix integer overflow of "credit"
if sch_fq is configured with "initial quantum" having values greater than INT_MAX, the first assignment of "credit" does signed integer overflow to a very negative value. In this situation, the syzkaller script provided by Cristoph triggers the CPU soft-lockup warning even with few sockets. It's not an infinite loop, but "credit" wasn't probably meant to be minus 2Gb for each new flow. Capping "initial quantum" to INT_MAX proved to fix the issue.
v2: validation of "initial quantum" is done in fq_policy, instead of open coding in fq_change() _ suggested by Jakub Kicinski
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-5.15.117-72.142Upgrade kernel-toolsUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.10.184-174.730Upgrade perf-debuginfoUpgrade kernel-tools-develUpgrade perfUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade python-perf-debuginfoUpgrade python-perfUpgrade kernel-headers | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade perf-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-tools-develUpgrade kernel-libbpf-staticUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade python3-perfUpgrade kernel-develUpgrade perfUpgrade bpftoolUpgrade kernel-libbpfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.29-47.49Upgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-headers | Oct 24, 2025 | Oct 7, 2025 |
| Debian | — | Upgrade linux | Oct 9, 2025 | Oct 9, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 7, 2025 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-aws-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-nvidia-tegra-igxUpgrade linux-hwe-5.15Upgrade linux-bluefieldUpgrade linux-raspiUpgrade linuxUpgrade linux-awsUpgrade linux-intel-iot-realtimeUpgrade linux-ibm-5.15Upgrade linux-ibmUpgrade linux-azure-fdeUpgrade linux-lowlatencyUpgrade linux-gkeopUpgrade linux-gkeUpgrade linux-nvidiaUpgrade linux-oracle-5.15Upgrade linux-riscv-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-azure-5.15Upgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-gcpUpgrade linux-kvmUpgrade linux-oracleUpgrade linux-intel-iotg-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-nvidia-tegra | Oct 10, 2025 | Oct 7, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Oct 7, 2025 |
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