CVE ID : CVE-2026-23004<\/p>\n
Published : Jan. 25, 2026, 3:15 p.m. | 1\u00a0hour, 46\u00a0minutes ago<\/p>\n
Description : In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()<\/p>\n
syzbot was able to crash the kernel in rt6_uncached_list_flush_dev()
\nin an interesting way [1]\n
Crash happens in list_del_init()\/INIT_LIST_HEAD() while writing
\nlist->prev, while the prior write on list->next went well.<\/p>\n
static 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}<\/p>\n
Issue 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.<\/p>\n
We 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.<\/p>\n
A similar fix is neeed for IPv4.<\/p>\n[1]\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<\/p>\n
CPU: 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:<\/p>\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<\/p>\n
Allocated 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—<\/p>\n
Severity: 0.0 | NA<\/p>\n
Visit the link for more details, such as CVSS details, affected products, timeline, and more…\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
CVE ID : CVE-2026-23004 Published : Jan. 25, 2026, 3:15 p.m. | 1\u00a0hour, 46\u00a0minutes ago Description : In the Linux kernel, the following vulnerability has been resolved: dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list() syzbot was able to crash the kernel in rt6_uncached_list_flush_dev() in an interesting way [1] Crash happens in list_del_init()\/INIT_LIST_HEAD() while writing list->prev, …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-75816","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/75816","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=75816"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/75816\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=75816"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=75816"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=75816"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}