In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net<\/p>\n
nfsd_file_dispose_list_delayed() defers fput() to nfsd service threads
\nvia a per-net freeme queue, preventing the shrinker and GC worker from
\nbearing the cost of closing files (see ffb402596147). However, the
\nqueue lives in a separately-allocated struct nfsd_fcache_disposal that
\nis freed by nfsd_free_fcache_disposal_net() during per-net teardown.
\nThe global shrinker, laundrette, and fsnotify callbacks can still be
\ninside nfsd_file_dispose_list_delayed() dereferencing that pointer,
\ncausing a use-after-free.<\/p>\n
Inline the spinlock and freeme list directly into struct nfsd_net (as
\nfcache_dispose_lock and fcache_dispose_list), eliminating the separately
\nallocated struct nfsd_fcache_disposal entirely. These fields now have
\nthe same lifetime as the net namespace itself, so there is no dangling
\npointer to chase.<\/p>\n
nfsd_file_cache_start_net() now just initializes the inline fields and
\ncannot fail due to allocation. nfsd_file_cache_shutdown_net() drains
\nthe inline list directly instead of freeing a separate struct. The
\nalloc\/free helpers are removed.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net<\/p>\n
nfsd_file_dispose_list_delayed() defers fput() to nfsd servi<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21604","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21604","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=21604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}