https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 11:28:26 +0000 https://vulnerability.circl.lu/vuln/cve-2026-98011 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>net/sched: hhf: clamp quantum in change and init paths</p> <p>hhf_change() accepts any quantum from userspace, including 1. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times under the qdisc lock (a soft lockup / denial of service).</p> <p>Add max(256U, ...) in hhf_change() matching fq_codel_change(). Clamp hhf_init() to [256, 1&lt;&lt;20] matching the siblings, and remove the old fallback that only set quantum=256 on overflow.</p> <p>Conditions to recreate the bug: CONFIG_NET_SCH_HHF=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices).</p> <p>tc qdisc add dev dummy0 root hhf tc qdisc change dev dummy0 root hhf quantum 1 stab data 32768 size_log 15 cell_log 0</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>net/sched: hhf: clamp quantum in change and init paths</p> <p>hhf_change() accepts any quantum from userspace, including 1. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times under the qdisc lock (a soft lockup / denial of service).</p> <p>Add max(256U, ...) in hhf_change() matching fq_codel_change(). Clamp hhf_init() to [256, 1&lt;&lt;20] matching the siblings, and remove the old fallback that only set quantum=256 on overflow.</p> <p>Conditions to recreate the bug: CONFIG_NET_SCH_HHF=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices).</p> <p>tc qdisc add dev dummy0 root hhf tc qdisc change dev dummy0 root hhf quantum 1 stab data 32768 size_log 15 cell_log 0</p> https://vulnerability.circl.lu/vuln/cve-2026-98011