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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ipv6: avoid possible UAF in ip6_route_mpath_notify()\n\nsyzbot found another use-after-free in ip6_route_mpath_notify() [1]\n\nCommit f7225172f25a (\"net/ipv6: prevent use after free in\nip6_route_mpath_notify\") was not able to fix the root cause.\n\nWe need to defer the fib6_info_release() calls after\nip6_route_mpath_notify(), in the cleanup phase.\n\n[1]\nBUG: KASAN: slab-use-after-free in rt6_fill_node+0x1460/0x1ac0\nRead of size 4 at addr ffff88809a07fc64 by task syz-executor.2/23037\n\nCPU: 0 PID: 23037 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-01035-gea7f3cfaa588 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n \u003cTASK\u003e\n  __dump_stack lib/dump_stack.c:88 [inline]\n  dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106\n  print_address_description mm/kasan/report.c:377 [inline]\n  print_report+0x167/0x540 mm/kasan/report.c:488\n  kasan_report+0x142/0x180 mm/kasan/report.c:601\n rt6_fill_node+0x1460/0x1ac0\n  inet6_rt_notify+0x13b/0x290 net/ipv6/route.c:6184\n  ip6_route_mpath_notify net/ipv6/route.c:5198 [inline]\n  ip6_route_multipath_add net/ipv6/route.c:5404 [inline]\n  inet6_rtm_newroute+0x1d0f/0x2300 net/ipv6/route.c:5517\n  rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597\n  netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543\n  netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n  netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367\n  netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x221/0x270 net/socket.c:745\n  ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584\n  ___sys_sendmsg net/socket.c:2638 [inline]\n  __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\n do_syscall_64+0xf9/0x240\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\nRIP: 0033:0x7f73dd87dda9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f73de6550c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 00007f73dd9ac050 RCX: 00007f73dd87dda9\nRDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005\nRBP: 00007f73dd8ca47a R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 000000000000006e R14: 00007f73dd9ac050 R15: 00007ffdbdeb7858\n \u003c/TASK\u003e\n\nAllocated by task 23037:\n  kasan_save_stack mm/kasan/common.c:47 [inline]\n  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n  poison_kmalloc_redzone mm/kasan/common.c:372 [inline]\n  __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389\n  kasan_kmalloc include/linux/kasan.h:211 [inline]\n  __do_kmalloc_node mm/slub.c:3981 [inline]\n  __kmalloc+0x22e/0x490 mm/slub.c:3994\n  kmalloc include/linux/slab.h:594 [inline]\n  kzalloc include/linux/slab.h:711 [inline]\n  fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155\n  ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3758\n  ip6_route_multipath_add net/ipv6/route.c:5298 [inline]\n  inet6_rtm_newroute+0x744/0x2300 net/ipv6/route.c:5517\n  rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597\n  netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543\n  netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n  netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367\n  netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x221/0x270 net/socket.c:745\n  ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584\n  ___sys_sendmsg net/socket.c:2638 [inline]\n  __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\n do_syscall_64+0xf9/0x240\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nFreed by task 16:\n  kasan_save_stack mm/kasan/common.c:47 [inline]\n  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n  kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640\n  poison_slab_object+0xa6/0xe0 m\n---truncated---"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix use-after-free bugs caused by sco_sock_timeout\n\nWhen the sco connection is established and then, the sco socket\nis releasing, timeout_work will be scheduled to judge whether\nthe sco disconnection is timeout. The sock will be deallocated\nlater, but it is dereferenced again in sco_sock_timeout. As a\nresult, the use-after-free bugs will happen. The root cause is\nshown below:\n\n    Cleanup Thread               |      Worker Thread\nsco_sock_release                 |\n  sco_sock_close                 |\n    __sco_sock_close             |\n      sco_sock_set_timer         |\n        schedule_delayed_work    |\n  sco_sock_kill                  |    (wait a time)\n    sock_put(sk) //FREE          |  sco_sock_timeout\n                                 |    sock_hold(sk) //USE\n\nThe KASAN report triggered by POC is shown below:\n\n[   95.890016] ==================================================================\n[   95.890496] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0x5e/0x1c0\n[   95.890755] Write of size 4 at addr ffff88800c388080 by task kworker/0:0/7\n...\n[   95.890755] Workqueue: events sco_sock_timeout\n[   95.890755] Call Trace:\n[   95.890755]  \u003cTASK\u003e\n[   95.890755]  dump_stack_lvl+0x45/0x110\n[   95.890755]  print_address_description+0x78/0x390\n[   95.890755]  print_report+0x11b/0x250\n[   95.890755]  ? __virt_addr_valid+0xbe/0xf0\n[   95.890755]  ? sco_sock_timeout+0x5e/0x1c0\n[   95.890755]  kasan_report+0x139/0x170\n[   95.890755]  ? update_load_avg+0xe5/0x9f0\n[   95.890755]  ? sco_sock_timeout+0x5e/0x1c0\n[   95.890755]  kasan_check_range+0x2c3/0x2e0\n[   95.890755]  sco_sock_timeout+0x5e/0x1c0\n[   95.890755]  process_one_work+0x561/0xc50\n[   95.890755]  worker_thread+0xab2/0x13c0\n[   95.890755]  ? pr_cont_work+0x490/0x490\n[   95.890755]  kthread+0x279/0x300\n[   95.890755]  ? pr_cont_work+0x490/0x490\n[   95.890755]  ? kthread_blkcg+0xa0/0xa0\n[   95.890755]  ret_from_fork+0x34/0x60\n[   95.890755]  ? kthread_blkcg+0xa0/0xa0\n[   95.890755]  ret_from_fork_asm+0x11/0x20\n[   95.890755]  \u003c/TASK\u003e\n[   95.890755]\n[   95.890755] Allocated by task 506:\n[   95.890755]  kasan_save_track+0x3f/0x70\n[   95.890755]  __kasan_kmalloc+0x86/0x90\n[   95.890755]  __kmalloc+0x17f/0x360\n[   95.890755]  sk_prot_alloc+0xe1/0x1a0\n[   95.890755]  sk_alloc+0x31/0x4e0\n[   95.890755]  bt_sock_alloc+0x2b/0x2a0\n[   95.890755]  sco_sock_create+0xad/0x320\n[   95.890755]  bt_sock_create+0x145/0x320\n[   95.890755]  __sock_create+0x2e1/0x650\n[   95.890755]  __sys_socket+0xd0/0x280\n[   95.890755]  __x64_sys_socket+0x75/0x80\n[   95.890755]  do_syscall_64+0xc4/0x1b0\n[   95.890755]  entry_SYSCALL_64_after_hwframe+0x67/0x6f\n[   95.890755]\n[   95.890755] Freed by task 506:\n[   95.890755]  kasan_save_track+0x3f/0x70\n[   95.890755]  kasan_save_free_info+0x40/0x50\n[   95.890755]  poison_slab_object+0x118/0x180\n[   95.890755]  __kasan_slab_free+0x12/0x30\n[   95.890755]  kfree+0xb2/0x240\n[   95.890755]  __sk_destruct+0x317/0x410\n[   95.890755]  sco_sock_release+0x232/0x280\n[   95.890755]  sock_close+0xb2/0x210\n[   95.890755]  __fput+0x37f/0x770\n[   95.890755]  task_work_run+0x1ae/0x210\n[   95.890755]  get_signal+0xe17/0xf70\n[   95.890755]  arch_do_signal_or_restart+0x3f/0x520\n[   95.890755]  syscall_exit_to_user_mode+0x55/0x120\n[   95.890755]  do_syscall_64+0xd1/0x1b0\n[   95.890755]  entry_SYSCALL_64_after_hwframe+0x67/0x6f\n[   95.890755]\n[   95.890755] The buggy address belongs to the object at ffff88800c388000\n[   95.890755]  which belongs to the cache kmalloc-1k of size 1024\n[   95.890755] The buggy address is located 128 bytes inside of\n[   95.890755]  freed 1024-byte region [ffff88800c388000, ffff88800c388400)\n[   95.890755]\n[   95.890755] The buggy address belongs to the physical page:\n[   95.890755] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800c38a800 pfn:0xc388\n[   95.890755] head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n[   95.890755] ano\n---truncated---"
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