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In the Linux kernel, the following vulnerability has been resolved:
net/sched: sfq: clamp quantum to avoid signed overflow soft lockup
sfq_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) (unsigned). A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return 0x80000000, so slot->allot = INT_MIN and INT_MIN + INT_MIN toggles between INT_MIN and 0 forever, spinning sfq_dequeue() under the qdisc lock.
Clamp the quantum to [256, 1 << 20] so the refill loop terminates. The lower bound also covers q->quantum == 0 (psched_mtu() returning 0), which spins sfq_dequeue() identically. sfq_change() already rejects a negative quantum, so only the init path was exposed.
Conditions to recreate the bug: a device whose MTU (plus hard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy device with max_mtu == 0 accepting MTU 2147483634). Requires CAP_NET_ADMIN in a user namespace.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade bpftool-debuginfoUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernelUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.15.221-157.262Upgrade kernel-develUpgrade kernel-toolsUpgrade python-perfUpgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-livepatch-5.10.270-271.1109Upgrade perf | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-modules-extra-commonUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel-modules-extraUpgrade perf6.18-debuginfoUpgrade kernel-toolsUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade python3-perf6.18Upgrade python3-perf-debuginfoUpgrade kernel6.18-develUpgrade python3-perf6.18-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-modules-extra-commonUpgrade bpftool6.18Upgrade kernelUpgrade perf6.18Upgrade kernel-livepatch-6.1.188-233.385Upgrade kernel-debuginfo-common-x86_64Upgrade bpftool6.18-debuginfoUpgrade kernel-debuginfoUpgrade kernel-develUpgrade kernel6.18-modules-extraUpgrade kernel-tools-develUpgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade microvm-kernel6.18Upgrade kernel6.18-debuginfoUpgrade perf-debuginfoUpgrade perfUpgrade kernel-livepatch-6.18.54-121.166Upgrade kernel6.18Upgrade kernel-tools-debuginfoUpgrade kernel6.18-toolsUpgrade kernel6.18-headersUpgrade kernel6.18-tools-develUpgrade kernel6.18-debuginfo-common-aarch64Upgrade python3-perf | Oct 20, 2026 | Sep 17, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 17, 2026 |
| Redhat_linux | — | No solution exists | Oct 15, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade linux-gcp-fipsUpgrade linux-azure-fipsUpgrade linux-oracleUpgrade linux-intel-iotgUpgrade linux-nvidia-tegra-igxUpgrade linuxUpgrade linux-riscv-7.0Upgrade linux-kvmUpgrade linux-nvidiaUpgrade linux-azure-fde-5.15Upgrade linux-aws-fipsUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-gcpUpgrade linux-hwe-7.0Upgrade linux-intel-iot-realtimeUpgrade linux-gkeopUpgrade linux-ibmUpgrade linux-oracle-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-lowlatencyUpgrade linux-azure-fdeUpgrade linux-fipsUpgrade linux-aws-5.15Upgrade linux-gcp-5.15Upgrade linux-bluefieldUpgrade linux-realtimeUpgrade linux-azureUpgrade linux-oem-7.0Upgrade linux-lowlatency-hwe-5.15Upgrade linux-riscvUpgrade linux-riscv-5.15Upgrade linux-awsUpgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-ibm-5.15Upgrade linux-nvidia-tegra | Nov 3, 2026 | Sep 17, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 17, 2026 |
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