{"id":"DEBIAN-CVE-2026-23004","details":"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-\u003eprev, while the prior write on list-\u003enext went well.  static inline void INIT_LIST_HEAD(struct list_head *list) { \tWRITE_ONCE(list-\u003enext, list); // This went well \tWRITE_ONCE(list-\u003eprev, list); // Crash, @list has been freed. }  Issue here is that rt6_uncached_list_del() did not attempt to lock ul-\u003elock, as list_empty(&rt-\u003edst.rt_uncached) returned true because the WRITE_ONCE(list-\u003enext, list) happened on the other CPU.  We might use list_del_init_careful() and list_empty_careful(), or make sure rt6_uncached_list_del() always grabs the spinlock whenever rt-\u003edst.rt_uncached_list has been set.  A similar fix is neeed for IPv4.  [1]   BUG: KASAN: slab-use-after-free in INIT_LIST_HEAD include/linux/list.h:46 [inline]  BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:296 [inline]  BUG: KASAN: slab-use-after-free in rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]  BUG: KASAN: slab-use-after-free in rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020 Write of size 8 at addr ffff8880294cfa78 by task kworker/u8:14/3450  CPU: 0 UID: 0 PID: 3450 Comm: kworker/u8:14 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: netns cleanup_net Call Trace:  \u003cTASK\u003e   dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120   print_address_description mm/kasan/report.c:378 [inline]   print_report+0xca/0x240 mm/kasan/report.c:482   kasan_report+0x118/0x150 mm/kasan/report.c:595   INIT_LIST_HEAD include/linux/list.h:46 [inline]   list_del_init include/linux/list.h:296 [inline]   rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]   rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020   addrconf_ifdown+0x143/0x18a0 net/ipv6/addrconf.c:3853  addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1   notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85   call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]   call_netdevice_notifiers net/core/dev.c:2282 [inline]   netif_close_many+0x29c/0x410 net/core/dev.c:1785   unregister_netdevice_many_notify+0xb50/0x2330 net/core/dev.c:12353   ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]   ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:248   cleanup_net+0x4de/0x7b0 net/core/net_namespace.c:696   process_one_work kernel/workqueue.c:3257 [inline]   process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340   worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421   kthread+0x711/0x8a0 kernel/kthread.c:463   ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246  \u003c/TASK\u003e  Allocated by task 803:   kasan_save_stack mm/kasan/common.c:57 [inline]   kasan_save_track+0x3e/0x80 mm/kasan/common.c:78   unpoison_slab_object mm/kasan/common.c:340 [inline]   __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366   kasan_slab_alloc include/linux/kasan.h:253 [inline]   slab_post_alloc_hook mm/slub.c:4953 [inline]   slab_alloc_node mm/slub.c:5263 [inline]   kmem_cache_alloc_noprof+0x18d/0x6c0 mm/slub.c:5270   dst_alloc+0x105/0x170 net/core/dst.c:89   ip6_dst_alloc net/ipv6/route.c:342 [inline]   icmp6_dst_alloc+0x75/0x460 net/ipv6/route.c:3333   mld_sendpack+0x683/0xe60 net/ipv6/mcast.c:1844   mld_send_cr net/ipv6/mcast.c:2154 [inline]   mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693   process_one_work kernel/workqueue.c:3257 [inline]   process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340   worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421   kthread+0x711/0x8a0 kernel/kthread.c:463   ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr ---truncated---","modified":"2026-09-01T16:06:34.614878255Z","published":"2026-01-25T15:15:55.273Z","upstream":["CVE-2026-23004"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-23004"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1","6.10-1~exp1","6.10.1-1~exp1","6.10.11-1","6.10.11-1~bpo12+1","6.10.12-1","6.10.3-1","6.10.4-1","6.10.6-1","6.10.6-1~bpo12+1","6.10.7-1","6.10.9-1","6.11-1~exp1","6.11.10-1","6.11.10-1~bpo12+1","6.11.2-1","6.11.4-1","6.11.5-1","6.11.5-1~bpo12+1","6.11.6-1","6.11.7-1","6.11.9-1","6.11~rc4-1~exp1","6.11~rc5-1~exp1","6.12.10-1","6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.11-1","6.12.11-1+alpha","6.12.11-1+alpha.1","6.12.12-1","6.12.12-1~bpo12+1","6.12.13-1","6.12.15-1","6.12.16-1","6.12.17-1","6.12.19-1","6.12.20-1","6.12.21-1","6.12.22-1","6.12.22-1~bpo12+1","6.12.25-1","6.12.27-1","6.12.27-1~bpo12+1","6.12.29-1","6.12.3-1","6.12.30-1","6.12.30-1~bpo12+1","6.12.31-1","6.12.32-1","6.12.32-1~bpo12+1","6.12.33-1","6.12.33-1~bpo12+1","6.12.35-1","6.12.35-1~bpo12+1","6.12.37-1","6.12.38-1","6.12.38-1~bpo12+1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.5-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.6-1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.8-1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.9-1","6.12.9-1+alpha","6.12.9-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.12~rc6-1~exp1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1","6.19.13-1~bpo13+1","6.19.14-1","6.19.14-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1","6.3.1-1~exp1","6.3.11-1","6.3.2-1~exp1","6.3.4-1~exp1","6.3.5-1~exp1","6.3.7-1","6.3.7-1~bpo12+1","6.4.1-1~exp1","6.4.11-1","6.4.13-1","6.4.4-1","6.4.4-1~bpo12+1","6.4.4-2","6.4.4-3","6.4.4-3~bpo12+1","6.4~rc6-1~exp1","6.4~rc7-1~exp1","6.5.1-1~exp1","6.5.10-1","6.5.10-1~bpo12+1","6.5.13-1","6.5.3-1","6.5.3-1~bpo12+1","6.5.6-1","6.5.8-1","6.5~rc4-1~exp1","6.5~rc6-1~exp1","6.5~rc7-1~exp1","6.6.11-1","6.6.13-1","6.6.13-1~bpo12+1","6.6.15-1","6.6.15-2","6.6.3-1~exp1","6.6.4-1~exp1","6.6.7-1~exp1","6.6.8-1","6.6.9-1","6.7-1~exp1","6.7.1-1~exp1","6.7.12-1","6.7.12-1~bpo12+1","6.7.4-1~exp1","6.7.7-1","6.7.9-1","6.7.9-2","6.8.11-1","6.8.12-1","6.8.12-1~bpo12+1","6.8.9-1","6.9.10-1","6.9.10-1~bpo12+1","6.9.11-1","6.9.12-1","6.9.2-1~exp1","6.9.7-1","6.9.7-1~bpo12+1","6.9.8-1","6.9.9-1","7.0-1~exp1","7.0.1-1~exp1","7.0.10-1","7.0.10-1~bpo13+1","7.0.12-1","7.0.12-2","7.0.12-2~bpo13+1","7.0.13-1","7.0.13-1~bpo13+1","7.0.14-1","7.0.3-1","7.0.4-1","7.0.4-1~bpo13+1","7.0.7-1","7.0.7-1~bpo13+1","7.0.9-1","7.0.9-1~bpo13+1","7.1.1-1~exp1","7.1.10-1",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