In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/sched: fq_pie: clamp quantum in change path<\/p>\n
fq_pie_change() accepts any quantum value from userspace, including 1.
\nWith a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1
\nmakes the deficit-refill loop spin ~2^31 times under the qdisc lock
\n(a soft lockup \/ denial of service).<\/p>\n
Add max(256U, …) matching fq_codel_change().<\/p>\n
Conditions to recreate the bug:
\n CONFIG_NET_SCH_FQ_PIE=y. Requires CAP_NET_ADMIN (namespace-local via
\n unshare -Urn suffices).<\/p>\n
tc qdisc add dev dummy0 root fq_pie
\n tc qdisc change dev dummy0 root fq_pie quantum 1 stab data 32768 size_log 15 cell_log 0<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/sched: fq_pie: clamp quantum in change path<\/p>\n
fq_pie_change() accepts any quantum value from userspace, including 1.
\nWith a craf<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29168","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29168","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=29168"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29168"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}