{"id":"DEBIAN-CVE-2022-48719","details":"In the Linux kernel, the following vulnerability has been resolved:  net, neigh: Do not trigger immediate probes on NUD_FAILED from neigh_managed_work  syzkaller was able to trigger a deadlock for NTF_MANAGED entries [0]:    kworker/0:16/14617 is trying to acquire lock:   ffffffff8d4dd370 (&tbl-\u003elock){++-.}-{2:2}, at: ___neigh_create+0x9e1/0x2990 net/core/neighbour.c:652   [...]   but task is already holding lock:   ffffffff8d4dd370 (&tbl-\u003elock){++-.}-{2:2}, at: neigh_managed_work+0x35/0x250 net/core/neighbour.c:1572  The neighbor entry turned to NUD_FAILED state, where __neigh_event_send() triggered an immediate probe as per commit cd28ca0a3dd1 (\"neigh: reduce arp latency\") via neigh_probe() given table lock was held.  One option to fix this situation is to defer the neigh_probe() back to the neigh_timer_handler() similarly as pre cd28ca0a3dd1. For the case of NTF_MANAGED, this deferral is acceptable given this only happens on actual failure state and regular / expected state is NUD_VALID with the entry already present.  The fix adds a parameter to __neigh_event_send() in order to communicate whether immediate probe is allowed or disallowed. Existing call-sites of neigh_event_send() default as-is to immediate probe. However, the neigh_managed_work() disables it via use of neigh_event_send_probe().  [0] \u003cTASK\u003e   __dump_stack lib/dump_stack.c:88 [inline]   dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106   print_deadlock_bug kernel/locking/lockdep.c:2956 [inline]   check_deadlock kernel/locking/lockdep.c:2999 [inline]   validate_chain kernel/locking/lockdep.c:3788 [inline]   __lock_acquire.cold+0x149/0x3ab kernel/locking/lockdep.c:5027   lock_acquire kernel/locking/lockdep.c:5639 [inline]   lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604   __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]   _raw_write_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:334   ___neigh_create+0x9e1/0x2990 net/core/neighbour.c:652   ip6_finish_output2+0x1070/0x14f0 net/ipv6/ip6_output.c:123   __ip6_finish_output net/ipv6/ip6_output.c:191 [inline]   __ip6_finish_output+0x61e/0xe90 net/ipv6/ip6_output.c:170   ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:201   NF_HOOK_COND include/linux/netfilter.h:296 [inline]   ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:224   dst_output include/net/dst.h:451 [inline]   NF_HOOK include/linux/netfilter.h:307 [inline]   ndisc_send_skb+0xa99/0x17f0 net/ipv6/ndisc.c:508   ndisc_send_ns+0x3a9/0x840 net/ipv6/ndisc.c:650   ndisc_solicit+0x2cd/0x4f0 net/ipv6/ndisc.c:742   neigh_probe+0xc2/0x110 net/core/neighbour.c:1040   __neigh_event_send+0x37d/0x1570 net/core/neighbour.c:1201   neigh_event_send include/net/neighbour.h:470 [inline]   neigh_managed_work+0x162/0x250 net/core/neighbour.c:1574   process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307   worker_thread+0x657/0x1110 kernel/workqueue.c:2454   kthread+0x2e9/0x3a0 kernel/kthread.c:377   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295   \u003c/TASK\u003e","modified":"2026-09-01T20:04:50.645439230Z","published":"2024-06-20T11:15:55.470Z","upstream":["CVE-2022-48719"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-48719"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48719.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48719.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48719.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}