CVE-2026-43164

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb().<br /> <br /> syzbot reported null-ptr-deref of udp_sk(sk)-&gt;udp_prod_queue. [0]<br /> <br /> Since the cited commit, udp_lib_init_sock() can fail, as can<br /> udp_init_sock() and udpv6_init_sock().<br /> <br /> Let&amp;#39;s handle the error in udplite_sk_init() and udplitev6_sk_init().<br /> <br /> [0]:<br /> BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:82 [inline]<br /> BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]<br /> BUG: KASAN: null-ptr-deref in __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719<br /> Read of size 4 at addr 0000000000000008 by task syz.2.18/2944<br /> <br /> CPU: 1 UID: 0 PID: 2944 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPTLAZY<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025<br /> Call Trace:<br /> <br /> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120<br /> kasan_report+0xa2/0xe0 mm/kasan/report.c:595<br /> check_region_inline mm/kasan/generic.c:-1 [inline]<br /> kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200<br /> instrument_atomic_read include/linux/instrumented.h:82 [inline]<br /> atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]<br /> __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719<br /> __udpv6_queue_rcv_skb net/ipv6/udp.c:795 [inline]<br /> udpv6_queue_rcv_one_skb+0xa2e/0x1ad0 net/ipv6/udp.c:906<br /> udp6_unicast_rcv_skb+0x227/0x380 net/ipv6/udp.c:1064<br /> ip6_protocol_deliver_rcu+0xe17/0x1540 net/ipv6/ip6_input.c:438<br /> ip6_input_finish+0x191/0x350 net/ipv6/ip6_input.c:489<br /> NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318<br /> ip6_input+0x16c/0x2b0 net/ipv6/ip6_input.c:500<br /> NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318<br /> __netif_receive_skb_one_core net/core/dev.c:6149 [inline]<br /> __netif_receive_skb+0xd3/0x370 net/core/dev.c:6262<br /> process_backlog+0x4d6/0x1160 net/core/dev.c:6614<br /> __napi_poll+0xae/0x320 net/core/dev.c:7678<br /> napi_poll net/core/dev.c:7741 [inline]<br /> net_rx_action+0x60d/0xdc0 net/core/dev.c:7893<br /> handle_softirqs+0x209/0x8d0 kernel/softirq.c:622<br /> do_softirq+0x52/0x90 kernel/softirq.c:523<br /> <br /> <br /> __local_bh_enable_ip+0xe7/0x120 kernel/softirq.c:450<br /> local_bh_enable include/linux/bottom_half.h:33 [inline]<br /> rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]<br /> __dev_queue_xmit+0x109c/0x2dc0 net/core/dev.c:4856<br /> __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]<br /> ip6_finish_output+0x158/0x4e0 net/ipv6/ip6_output.c:219<br /> NF_HOOK_COND include/linux/netfilter.h:307 [inline]<br /> ip6_output+0x342/0x580 net/ipv6/ip6_output.c:246<br /> ip6_send_skb+0x1d7/0x3c0 net/ipv6/ip6_output.c:1984<br /> udp_v6_send_skb+0x9a5/0x1770 net/ipv6/udp.c:1442<br /> udp_v6_push_pending_frames+0xa2/0x140 net/ipv6/udp.c:1469<br /> udpv6_sendmsg+0xfe0/0x2830 net/ipv6/udp.c:1759<br /> sock_sendmsg_nosec net/socket.c:727 [inline]<br /> __sock_sendmsg+0xe5/0x270 net/socket.c:742<br /> __sys_sendto+0x3eb/0x580 net/socket.c:2206<br /> __do_sys_sendto net/socket.c:2213 [inline]<br /> __se_sys_sendto net/socket.c:2209 [inline]<br /> __x64_sys_sendto+0xde/0x100 net/socket.c:2209<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xd2/0xf20 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> RIP: 0033:0x7f67b4d9c629<br /> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48<br /> RSP: 002b:00007f67b5c98028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c<br /> RAX: ffffffffffffffda RBX: 00007f67b5015fa0 RCX: 00007f67b4d9c629<br /> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003<br /> RBP: 00007f67b4e32b39 R08: 0000000000000000 R09: 0000000000000000<br /> R10: 0000000000040000 R11: 0000000000000246 R12: 0000000000000000<br /> R13: 00007f67b5016038 R14: 00007f67b5015fa0 R15: 00007ffe3cb66dd8<br />