In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
netfilter: ipset: fix race between dump and ip_set_list resize<\/p>\n
The release path of ip_set_dump_do() and ip_set_dump_done() read
\ninst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw()
\nof the array pointer. These run from netlink_recvmsg() without the nfnl
\nmutex and without an RCU read-side critical section.<\/p>\n
A concurrent ip_set_create() can grow the array: it publishes the new
\narray, calls synchronize_net() and then kvfree()s the old one. Since the
\ndump paths read the array outside any RCU reader, synchronize_net() does
\nnot wait for them and the old array can be freed while they still index
\ninto it, causing a use-after-free.<\/p>\n
The dumped set itself stays pinned via set->ref_netlink, so only the
\narray load needs protecting. Take rcu_read_lock() around it, matching
\nip_set_get_byname() and __ip_set_put_byindex().<\/p>\n
BUG: KASAN: slab-use-after-free in ip_set_dump_do (net\/netfilter\/ipset\/ip_set_core.c:1697)
\n Read of size 8 at addr ffff88800b5c4018 by task exploit\/150
\n Call Trace:
\n …
\n kasan_report (mm\/kasan\/report.c:595)
\n ip_set_dump_do (net\/netfilter\/ipset\/ip_set_core.c:1697)
\n netlink_dump (net\/netlink\/af_netlink.c:2325)
\n netlink_recvmsg (net\/netlink\/af_netlink.c:1976)
\n sock_recvmsg (net\/socket.c:1159)
\n __sys_recvfrom (net\/socket.c:2315)
\n …
\n Oops: general protection fault, probably for non-canonical address … KASAN NOPTI
\n KASAN: maybe wild-memory-access in range [0x02d6…d0-0x02d6…d7]
\n RIP: 0010:ip_set_dump_do (net\/netfilter\/ipset\/ip_set_core.c:1698)
\n Kernel panic – not syncing: Fatal exception<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
netfilter: ipset: fix race between dump and ip_set_list resize<\/p>\n
The release path of ip_set_dump_do() and ip_set_dump_done() read
\nin<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15188","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15188","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=15188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15188"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}