In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sched_ext: Skip sub-disable teardown for never-linked sub-schedulers<\/p>\n
A sub-scheduler enable can fail before scx_link_sched() links the sched into
\nthe hierarchy, e.g. when the parent is already being disabled, and cleanup
\nstill runs the full scx_sub_disable().<\/p>\n
That is racy against root disable: drain_descendants() is the only ordering
\nbetween a sub’s disable-time task walk and root disable’s all-task teardown,
\nand an unlinked sub is invisible to it. Root’s teardown can thus run between
\nthe never-linked sub’s drain and its walk, exiting every task to no
\nscheduler.<\/p>\n
The walk then trips the membership WARN and re-homes the exited tasks onto
\nthe dying hierarchy, a use-after-free.<\/p>\n
Skip the cgroup ownership reset and the task walk if @sch was never linked,
\nindicated by the empty ->sibling as unlinking only happens later in the same
\nfunction. The membership WARN remains valid: a linked sub is always waited
\non by an ancestor’s drain.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sched_ext: Skip sub-disable teardown for never-linked sub-schedulers<\/p>\n
A sub-scheduler enable can fail before scx_link_sched() links<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11293","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11293","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=11293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11293"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}