{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23004",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23004"
  ],
  "published": "2026-01-25T14:36:48Z",
  "summary": "dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()\n\nsyzbot was able to crash the kernel in rt6_uncached_list_flush_dev()\nin an interesting way [1]\n\nCrash happens in list_del_init()/INIT_LIST_HEAD() while writing\nlist->prev, while the prior write on list->next went well.\n\nstatic inline void INIT_LIST_HEAD(struct list_head *list)\n{\n\tWRITE_ONCE(list->next, list); // This went well\n\tWRITE_ONCE(list->prev, list); // Crash, @list has been freed.\n}\n\nIssue here is that rt6_uncached_list_del() did not attempt to lock\nul->lock, as list_empty(&rt->dst.rt_uncached) returned\ntrue because the WRITE_ONCE(list->next, list) happened on the other CPU.\n\nWe might use list_del_init_careful() and list_empty_careful(),\nor make sure rt6_uncached_list_del() always grabs the spinlock\nwhenever rt->dst.rt_uncached_list has been set.\n\nA similar fix is neeed for IPv4.\n\n[1]\n\n BUG: KASAN: slab-use-after-free in INIT_LIST_HEAD include/linux/list.h:46 [inline]\n BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:296 [inline]\n BUG: KASAN: slab-use-after-free in rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n BUG: KASAN: slab-use-after-free in rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\nWrite of size 8 at addr ffff8880294cfa78 by task kworker/u8:14/3450\n\nCPU: 0 UID: 0 PID: 3450 Comm: kworker/u8:14 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)}\nTainted: [L]=SOFTLOCKUP\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nWorkqueue: netns cleanup_net\nCall Trace:\n <TASK>\n  dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n  print_address_description mm/kasan/report.c:378 [inline]\n  print_report+0xca/0x240 mm/kasan/report.c:482\n  kasan_report+0x118/0x150 mm/kasan/report.c:595\n  INIT_LIST_HEAD include/linux/list.h:46 [inline]\n  list_del_init include/linux/list.h:296 [inline]\n  rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n  rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\n  addrconf_ifdown+0x143/0x18a0 net/ipv6/addrconf.c:3853\n addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1\n  notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85\n  call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]\n  call_netdevice_notifiers net/core/dev.c:2282 [inline]\n  netif_close_many+0x29c/0x410 net/core/dev.c:1785\n  unregister_netdevice_many_notify+0xb50/0x2330 net/core/dev.c:12353\n  ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:248\n  cleanup_net+0x4de/0x7b0 net/core/net_namespace.c:696\n  process_one_work kernel/workqueue.c:3257 [inline]\n  process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n </TASK>\n\nAllocated by task 803:\n  kasan_save_stack mm/kasan/common.c:57 [inline]\n  kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\n  unpoison_slab_object mm/kasan/common.c:340 [inline]\n  __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366\n  kasan_slab_alloc include/linux/kasan.h:253 [inline]\n  slab_post_alloc_hook mm/slub.c:4953 [inline]\n  slab_alloc_node mm/slub.c:5263 [inline]\n  kmem_cache_alloc_noprof+0x18d/0x6c0 mm/slub.c:5270\n  dst_alloc+0x105/0x170 net/core/dst.c:89\n  ip6_dst_alloc net/ipv6/route.c:342 [inline]\n  icmp6_dst_alloc+0x75/0x460 net/ipv6/route.c:3333\n  mld_sendpack+0x683/0xe60 net/ipv6/mcast.c:1844\n  mld_send_cr net/ipv6/mcast.c:2154 [inline]\n  mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693\n  process_one_work kernel/workqueue.c:3257 [inline]\n  process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr\n---truncated---",
  "affected": [
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