In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/sched: ets: clamp quantum in parse and fallback paths<\/p>\n
ets_qdisc_change() falls back to psched_mtu() with no floor for bands
\nwithout an explicit quantum. With a crafted size table qdisc_pkt_len
\nreaches ~2 GiB, so a zero psched_mtu on a headerless device makes the
\ndeficit-refill loop spin under the qdisc lock.<\/p>\n
Move the floor into ets_quantum_parse() so explicitly configured quanta
\nare also clamped to [256, 1<<20], not just the fallback path.<\/p>\n
Conditions to recreate the bug:
\n CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via
\n unshare -Urn suffices).<\/p>\n
tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/sched: ets: clamp quantum in parse and fallback paths<\/p>\n
ets_qdisc_change() falls back to psched_mtu() with no floor for bands
\nwi<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29164","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29164","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}