In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: bridge: mdb: restart port group walk after deletion<\/p>\n
br_mdb_flush_pgs() keeps a pointer-to-pointer cursor while walking
\nmp->ports. br_multicast_del_pg() can re-enter the same MDB entry through
\nbr_multicast_sg_del_exclude_ports() and unlink other port groups. If the
\ncursor points into one of those groups, the next iteration dereferences a
\nstale cursor and can leave mp->ports pointing at freed memory.<\/p>\n
A following RTM_GETMDB exposes the dangling pointer:<\/p>\n
BUG: KASAN: slab-use-after-free in br_mdb_dump
\n Read of size 8
\n br_mdb_dump
\n rtnl_mdb_dump
\n rtnl_dumpit
\n netlink_dump<\/p>\n
Reset the cursor to mp->ports after every deletion. The deletion removes at
\nleast the selected group, so the restarted walk always makes progress.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: bridge: mdb: restart port group walk after deletion<\/p>\n
br_mdb_flush_pgs() keeps a pointer-to-pointer cursor while walking
\nmp->po<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-40959","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/40959","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=40959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}