In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ALSA: pcm: wake linked drain waiters on unlink<\/p>\n
snd_pcm_drain() on a linked stream parks an on-stack wait entry on the
\ndrained peer’s runtime->sleep, and after schedule_timeout() removes it
\nonly if that peer is still found in the caller’s group. If group
\nmembership changes during the wait and the sleep ends by signal or
\ntimeout (so autoremove_wake_function() does not run), finish_wait() is
\nskipped and snd_pcm_drain() returns with the entry still queued on that
\nstream’s sleep list; a later wake_up() then walks a freed stack frame.
\nThis is reachable by unlinking either the drained or the draining stream.<\/p>\n
Unlike the close path (snd_pcm_drop() -> snd_pcm_post_stop()),
\nsnd_pcm_unlink() never wakes the sleep queues. Wake every group member
\nunder the group lock before the membership change, so a linked drainer is
\nreleased and drops its entry while the streams are still grouped.<\/p>\n
The window was opened when snd_pcm_link_rwsem stopped being held across
\nthe wait and the removal became conditional on group membership (see
\nFixes). The later switch to finish_wait() kept that conditional removal,
\nso the signal\/timeout case remained.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ALSA: pcm: wake linked drain waiters on unlink<\/p>\n
snd_pcm_drain() on a linked stream parks an on-stack wait entry on the
\ndrained peer<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12357","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12357","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=12357"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12357"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}