In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
RDMA\/core: Fix potential use after free in ib_destroy_cq_user()<\/p>\n
When accessing a CQ via the netlink path the only synchronization
\nmechanism for the said CQ is rdma_restrack_get().
\nCurrently, rdma_restrack_del() is invoked at the end of
\nib_destroy_cq_user(), which is too late, since by that point
\nvendor-specific resources associated with the CQ might already be
\nfreed. This can leave a short window where the CQ remains accessible
\nthrough restrack, leading to a potential use-after-free.<\/p>\n
Fix this by moving the rdma_restrack_begin_del() call to the start of
\nib_destroy_cq_user(), ensuring that the CQ is removed from restrack
\nbefore its internal resources are released. This guarantees that no new
\nusers hold references to a CQ that is in the process of destruction.<\/p>\n
In addition, this change preserves the intended inverted order
\nbetween create and destroy routines: resources are added to
\nrestrack at the end of successful creation, and hence shall be removed
\nfrom the restrack first thing during the destruction flow, which keeps
\nthe lifecycle management consistent and predictable.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
RDMA\/core: Fix potential use after free in ib_destroy_cq_user()<\/p>\n
When accessing a CQ via the netlink path the only synchronization<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25880","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25880","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=25880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}