https://db.gcve.eu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 14:33:24 +0000 https://db.gcve.eu/vuln/cve-2026-98012 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>net/sched: sfq: clamp quantum in change path</p> <p>sfq_change() accepts any non-negative quantum (only rejects (int)ctl-&gt;quantum &lt; 0). 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, ...) matching fq_codel_change(). Reject quantum &gt; 1&lt;&lt;20 with -EINVAL, matching fq_codel_change() and the init clamp.</p> <p>Conditions to recreate the bug: CONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices).</p> <p>tc qdisc add dev dummy0 root sfq tc qdisc change dev dummy0 root sfq 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: sfq: clamp quantum in change path</p> <p>sfq_change() accepts any non-negative quantum (only rejects (int)ctl-&gt;quantum &lt; 0). 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, ...) matching fq_codel_change(). Reject quantum &gt; 1&lt;&lt;20 with -EINVAL, matching fq_codel_change() and the init clamp.</p> <p>Conditions to recreate the bug: CONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices).</p> <p>tc qdisc add dev dummy0 root sfq tc qdisc change dev dummy0 root sfq quantum 1 stab data 32768 size_log 15 cell_log 0</p> https://db.gcve.eu/vuln/cve-2026-98012