In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: avoid leaking pre-allocated openowner on unconfirmed retry race<\/p>\n
When find_or_alloc_open_stateowner() encounters an unconfirmed owner, it
\ncalls release_openowner() and sets oo = NULL. Control then falls through
\npast the `if (oo)` guard — which would have freed any pre-allocated
\n`new` — and unconditionally executes `new = alloc_stateowner(…)`. If
\n`new` was already allocated on a prior iteration, the pointer is
\nsilently overwritten and the previous allocation (slab object + owner
\nname buffer) is leaked.<\/p>\n
This requires a race: two NFSv4.0 OPEN threads with the same owner
\nstring, where a concurrent thread inserts a new unconfirmed owner into
\nthe hash between retry iterations. The window is narrow but repeatable
\nunder adversarial conditions.<\/p>\n
Fix by adding `goto retry` after `oo = NULL` so the already-allocated
\n`new` is reused on the next iteration rather than overwritten.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: avoid leaking pre-allocated openowner on unconfirmed retry race<\/p>\n
When find_or_alloc_open_stateowner() encounters an unconfirm<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14862","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14862","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=14862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}