In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
netfilter: ipset: fix refcount race between list:set GC and swap<\/p>\n
__ip_set_put_byindex() resolved the index to a set pointer under RCU,
\nthen took ip_set_ref_lock in __ip_set_put() to decrement set->ref.
\nip_set_swap() holds that same lock while swapping both the ip_set_list
\nslots and the two sets’ ref counters, so it can interleave between the
\ndereference and the lock acquisition, leaving the caller to decrement a
\nset whose reference already moved to the other index and hit
\nBUG_ON(set->ref == 0). list_set_gc() reaches this from timer softirq,
\nwhich the nfnl mutex does not serialize against swap: an expiring
\nlist:set member calls list_set_del() -> ip_set_put_byindex() while
\nIPSET_CMD_SWAP runs on the referenced sets.<\/p>\n
Resolve the index and decrement under ip_set_ref_lock, as ip_set_swap()
\nalready does, keeping the refcount tied to the index rather than to a
\nstale set pointer.<\/p>\n
kernel BUG at net\/netfilter\/ipset\/ip_set_core.c:685!
\n Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
\n RIP: 0010:ip_set_put_byindex (net\/netfilter\/ipset\/ip_set_core.c:870)
\n Call Trace:<\/p>\n
list_set_del (net\/netfilter\/ipset\/ip_set_list_set.c:159)
\n set_cleanup_entries (net\/netfilter\/ipset\/ip_set_list_set.c:181)
\n list_set_gc (net\/netfilter\/ipset\/ip_set_list_set.c:578)
\n call_timer_fn (kernel\/time\/timer.c:1748)
\n __run_timers (kernel\/time\/timer.c:1799 kernel\/time\/timer.c:2374)
\n run_timer_softirq (kernel\/time\/timer.c:2405)<\/p>\n
Kernel panic – not syncing: Fatal exception in interrupt<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
netfilter: ipset: fix refcount race between list:set GC and swap<\/p>\n
__ip_set_put_byindex() resolved the index to a set pointer under <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11929","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11929","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=11929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}