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In the Linux kernel, the following vulnerability has been resolved:
net/sched: hhf: clamp quantum before hhf_change() to avoid overflow
hhf_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) with no overflow check. A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes weight * quantum overflow the signed deficit in hhf_dequeue(), spinning forever.
Clamp q->quantum before hhf_change() so both the opt and !opt paths see a sane quantum. Without this, bare "tc qdisc add ... hhf" succeeds with a clamped quantum but "tc qdisc add ... hhf limit 1000" (any option present) fails with -EINVAL because hhf_change() re-validates the unclamped default (sch_hhf.c:559). 256 matches fq_codel's floor and is a sane minimum for a DRR quantum.
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 python-perf-debuginfoUpgrade python-perfUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade perfUpgrade kernel-debuginfoUpgrade kernel-livepatch-5.10.270-271.1109Upgrade kernelUpgrade kernel-livepatch-5.15.221-157.262Upgrade bpftoolUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade perf-debuginfo | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-modules-extraUpgrade bpftoolUpgrade kernel6.18Upgrade python3-perf6.18Upgrade python3-perf6.18-debuginfoUpgrade kernel-modules-extra-commonUpgrade kernel6.18-develUpgrade kernel6.18-modules-extra-commonUpgrade perf6.18Upgrade kernel6.18-tools-develUpgrade bpftool6.18Upgrade python3-perf-debuginfoUpgrade kernel-develUpgrade kernelUpgrade kernel-toolsUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade microvm-kernel6.18Upgrade kernel6.18-tools-debuginfoUpgrade kernel-livepatch-6.18.54-121.166Upgrade perf6.18-debuginfoUpgrade kernel6.18-debuginfoUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-toolsUpgrade kernel-tools-develUpgrade kernel-livepatch-6.1.188-233.385Upgrade kernel-debuginfoUpgrade perfUpgrade python3-perfUpgrade kernel-debuginfo-common-aarch64Upgrade bpftool6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade kernel-headersUpgrade perf-debuginfo | 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-realtimeUpgrade linux-azure-fdeUpgrade linux-awsUpgrade linux-oem-7.0Upgrade linux-riscv-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-hwe-5.15Upgrade linux-riscvUpgrade linux-gcp-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-aws-5.15Upgrade linux-ibm-5.15Upgrade linux-gkeUpgrade linux-bluefieldUpgrade linux-nvidia-tegraUpgrade linux-lowlatencyUpgrade linux-fipsUpgrade linux-azureUpgrade linux-gkeopUpgrade linux-intel-iotg-5.15Upgrade linux-azure-fipsUpgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linuxUpgrade linux-nvidia-tegra-igxUpgrade linux-gcp-fipsUpgrade linux-intel-iotgUpgrade linux-oracle-5.15Upgrade linux-riscv-7.0Upgrade linux-azure-fde-5.15Upgrade linux-hwe-7.0Upgrade linux-ibmUpgrade linux-intel-iot-realtimeUpgrade linux-nvidiaUpgrade linux-gcpUpgrade linux-aws-fips | 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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