In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: initialize copy-notify stateid before publishing it<\/p>\n
nfsd4_copy_notify() finished initializing the cpntf state after
\nnfs4_alloc_init_cpntf_state() had already linked it into the
\ns2s_cp_stateids IDR and the parent’s sc_cp_list, with cs_count == 1 (the
\nmembership reference) and none held for the caller. A racing
\nOFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable
\nso_id) could reach manage_cpntf_state() and free the entry, turning the
\ncaller’s subsequent cpn_cnr_stateid read and cp_p_stateid\/cp_p_clid
\nwrites into use-after-free. The owning clientid was also only recorded
\nafter publication, so it could not gate an ownership check in that window.<\/p>\n
Record cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state()
\nbefore nfs4_init_cp_state() publishes the entry, and return it with an
\nextra reference. The caller reads the stateid under that reference and
\ndrops it with nfs4_put_cpntf_state(); on a late error the laundromat
\nreaps the entry.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: initialize copy-notify stateid before publishing it<\/p>\n
nfsd4_copy_notify() finished initializing the cpntf state after
\nnfs4_all<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21591","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21591","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=21591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}