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 bpftool-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade bpftoolUpgrade kernelUpgrade kernel-livepatch-5.15.117-72.142Upgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-livepatch-5.10.184-174.730Upgrade kernel-tools-develUpgrade perfUpgrade kernel-tools-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-tools-debuginfoUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-libbpfUpgrade python3-perf-debuginfoUpgrade kernel-livepatch-6.1.29-47.49Upgrade kernel-toolsUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernelUpgrade perfUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-libbpf-staticUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade python3-perf | Oct 24, 2025 | Oct 7, 2025 |
| Debian | — | Upgrade linux | Oct 9, 2025 | Oct 9, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade bpftool | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 7, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-awsUpgrade linux-bluefieldUpgrade linux-nvidia-tegra-igxUpgrade linux-aws-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-azureUpgrade linux-raspiUpgrade linuxUpgrade linux-oracleUpgrade linux-intel-iotg-5.15Upgrade linux-intel-iotgUpgrade linux-intel-iot-realtimeUpgrade linux-xilinx-zynqmpUpgrade linux-azure-5.15Upgrade linux-gcpUpgrade linux-gkeopUpgrade linux-nvidiaUpgrade linux-ibm-5.15Upgrade linux-lowlatencyUpgrade linux-realtimeUpgrade linux-nvidia-tegraUpgrade linux-ibmUpgrade linux-gcp-5.15Upgrade linux-kvmUpgrade linux-gkeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-riscv-5.15Upgrade linux-oracle-5.15 | 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 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub