{"id":7660,"date":"2025-07-04T17:01:42","date_gmt":"2025-07-04T17:01:42","guid":{"rendered":"http:\/\/localhost\/?p=7660"},"modified":"2025-07-04T17:01:42","modified_gmt":"2025-07-04T17:01:42","slug":"net-neigh-do-not-trigger-immediate-probes-on-nudfailed-from-neighmanagedwork","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=7660","title":{"rendered":"net, neigh: Do not trigger immediate probes on NUD_FAILED from neigh_managed_work"},"content":{"rendered":"<div style=\"font-family: Arial, sans-serif; max-width: 1200px; margin: 0 auto;\">\n<h2 style=\"color: #333; border-bottom: 2px solid #666666; padding-bottom: 10px;\">CVE Details<\/h2>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-bottom: 20px;\">\n<div style=\"padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1);\">\n<h3 style=\"margin-top: 0; \">Basic Information<\/h3>\n<table style=\"width:100%; border-collapse: collapse;\">\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Title<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">net, neigh: Do not trigger immediate probes on NUD_FAILED from neigh_managed_work<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Type<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">cve<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Published<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">2024-06-20T11:13:11.362Z<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Modified<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">2025-05-04T08:21:41.202Z<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div style=\"padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1);\">\n<h3 style=\"margin-top: 0; \">Product Information<\/h3>\n<table style=\"width:100%; border-collapse: collapse;\">\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Vendor<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">Linux<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Product<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">Linux<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Version<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">7482e3841d520a368426ac196720601687e2dc47<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<\/div>\n<div style=\"padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); margin-bottom: 20px;\">\n<h3 style=\"margin-top: 0; \">CVSS Information<\/h3>\n<table style=\"width:100%; border-collapse: collapse;\">\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Base Score<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd; color: #666666; font-weight: bold;\">0.0 ()<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div style=\"padding: 15px; border-radius: 5px; margin-bottom: 20px;\">\n<h4 style=\"margin-top: 0; \">Affected Products<\/h4>\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li>Linux Linux 7482e3841d520a368426ac196720601687e2dc47<\/li>\n<li>Linux Linux 7482e3841d520a368426ac196720601687e2dc47<\/li>\n<li>Linux Linux 5.16<\/li>\n<\/ul>\n<\/div>\n<div style=\"padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); margin-bottom: 20px;\">\n<h3 style=\"margin-top: 0; \">Additional Information<\/h3>\n<table style=\"width:100%; border-collapse: collapse;\">\n<tr>\n<th style=\"text-align: left; padding: 8px; border-bottom: 1px solid #ddd;\">Source<\/th>\n<td style=\"padding: 8px; border-bottom: 1px solid #ddd;\">Linux<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div style=\"padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); margin-bottom: 20px;\">\n<h3 style=\"margin-top: 0; \">Description<\/h3>\n<div style=\"padding: 15px; border-left: 4px solid #4CAF50; \">In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net, neigh: Do not trigger immediate probes on NUD_FAILED from neigh_managed_work<\/p>\n<p>syzkaller was able to trigger a deadlock for NTF_MANAGED entries [0]:<\/p>\n<p>  kworker\/0:16\/14617 is trying to acquire lock:<br \/>  ffffffff8d4dd370 (&#038;tbl->lock){++-.}-{2:2}, at: ___neigh_create+0x9e1\/0x2990 net\/core\/neighbour.c:652<br \/>  [&#8230;]<br \/>  but task is already holding lock:<br \/>  ffffffff8d4dd370 (&#038;tbl->lock){++-.}-{2:2}, at: neigh_managed_work+0x35\/0x250 net\/core\/neighbour.c:1572<\/p>\n<p>The neighbor entry turned to NUD_FAILED state, where __neigh_event_send()<br \/>triggered an immediate probe as per commit cd28ca0a3dd1 (&#8220;neigh: reduce<br \/>arp latency&#8221;) via neigh_probe() given table lock was held.<\/p>\n<p>One option to fix this situation is to defer the neigh_probe() back to<br \/>the neigh_timer_handler() similarly as pre cd28ca0a3dd1. For the case<br \/>of NTF_MANAGED, this deferral is acceptable given this only happens on<br \/>actual failure state and regular \/ expected state is NUD_VALID with the<br \/>entry already present.<\/p>\n<p>The fix adds a parameter to __neigh_event_send() in order to communicate<br \/>whether immediate probe is allowed or disallowed. Existing call-sites<br \/>of neigh_event_send() default as-is to immediate probe. However, the<br \/>neigh_managed_work() disables it via use of neigh_event_send_probe().<\/p>\n<p>[0] <TASK><br \/>  __dump_stack lib\/dump_stack.c:88 [inline]<br \/>  dump_stack_lvl+0xcd\/0x134 lib\/dump_stack.c:106<br \/>  print_deadlock_bug kernel\/locking\/lockdep.c:2956 [inline]<br \/>  check_deadlock kernel\/locking\/lockdep.c:2999 [inline]<br \/>  validate_chain kernel\/locking\/lockdep.c:3788 [inline]<br \/>  __lock_acquire.cold+0x149\/0x3ab kernel\/locking\/lockdep.c:5027<br \/>  lock_acquire kernel\/locking\/lockdep.c:5639 [inline]<br \/>  lock_acquire+0x1ab\/0x510 kernel\/locking\/lockdep.c:5604<br \/>  __raw_write_lock_bh include\/linux\/rwlock_api_smp.h:202 [inline]<br \/>  _raw_write_lock_bh+0x2f\/0x40 kernel\/locking\/spinlock.c:334<br \/>  ___neigh_create+0x9e1\/0x2990 net\/core\/neighbour.c:652<br \/>  ip6_finish_output2+0x1070\/0x14f0 net\/ipv6\/ip6_output.c:123<br \/>  __ip6_finish_output net\/ipv6\/ip6_output.c:191 [inline]<br \/>  __ip6_finish_output+0x61e\/0xe90 net\/ipv6\/ip6_output.c:170<br \/>  ip6_finish_output+0x32\/0x200 net\/ipv6\/ip6_output.c:201<br \/>  NF_HOOK_COND include\/linux\/netfilter.h:296 [inline]<br \/>  ip6_output+0x1e4\/0x530 net\/ipv6\/ip6_output.c:224<br \/>  dst_output include\/net\/dst.h:451 [inline]<br \/>  NF_HOOK include\/linux\/netfilter.h:307 [inline]<br \/>  ndisc_send_skb+0xa99\/0x17f0 net\/ipv6\/ndisc.c:508<br \/>  ndisc_send_ns+0x3a9\/0x840 net\/ipv6\/ndisc.c:650<br \/>  ndisc_solicit+0x2cd\/0x4f0 net\/ipv6\/ndisc.c:742<br \/>  neigh_probe+0xc2\/0x110 net\/core\/neighbour.c:1040<br \/>  __neigh_event_send+0x37d\/0x1570 net\/core\/neighbour.c:1201<br \/>  neigh_event_send include\/net\/neighbour.h:470 [inline]<br \/>  neigh_managed_work+0x162\/0x250 net\/core\/neighbour.c:1574<br \/>  process_one_work+0x9ac\/0x1650 kernel\/workqueue.c:2307<br \/>  worker_thread+0x657\/0x1110 kernel\/workqueue.c:2454<br \/>  kthread+0x2e9\/0x3a0 kernel\/kthread.c:377<br \/>  ret_from_fork+0x1f\/0x30 arch\/x86\/entry\/entry_64.S:295<br \/>  <\/TASK><\/div>\n<\/div>\n<div style=\"padding: 15px; border-radius: 5px; margin-bottom: 20px;\">\n<h4 style=\"margin-top: 0; \">References<\/h4>\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li><a href=\"https:\/\/git.kernel.org\/stable\/c\/203a35ebb49cdce377416b0690215d3ce090d364\" target=\"_blank\">https:\/\/git.kernel.org\/stable\/c\/203a35ebb49cdce377416b0690215d3ce090d364<\/a><\/li>\n<li><a href=\"https:\/\/git.kernel.org\/stable\/c\/4a81f6da9cb2d1ef911131a6fd8bd15cb61fc772\" target=\"_blank\">https:\/\/git.kernel.org\/stable\/c\/4a81f6da9cb2d1ef911131a6fd8bd15cb61fc772<\/a><\/li>\n<\/ul>\n<\/div>\n<div style=\"text-align: center; margin-top: 30px;\">\n<a href=\"\" target=\"_blank\" style=\"display: inline-block; background-color: #4CAF50; color: white; padding: 12px 24px; text-decoration: none; border-radius: 4px; font-weight: bold; transition: background-color 0.3s;\">View Full CVE Details<\/a>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>CVE Details Basic Information Title net, neigh: Do not trigger immediate probes on NUD_FAILED from neigh_managed_work Type cve Published 2024-06-20T11:13:11.362Z Modified 2025-05-04T08:21:41.202Z Product Information Vendor&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,12,13,7,11,5],"class_list":["post-7660","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-exploit","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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