{"id":"DEBIAN-CVE-2026-43164","details":"In the Linux kernel, the following vulnerability has been resolved:  udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb().  syzbot reported null-ptr-deref of udp_sk(sk)-\u003eudp_prod_queue. [0]  Since the cited commit, udp_lib_init_sock() can fail, as can udp_init_sock() and udpv6_init_sock().  Let's handle the error in udplite_sk_init() and udplitev6_sk_init().  [0]: BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:82 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: null-ptr-deref in __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719 Read of size 4 at addr 0000000000000008 by task syz.2.18/2944  CPU: 1 UID: 0 PID: 2944 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPTLAZY Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace:  \u003cIRQ\u003e  dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120  kasan_report+0xa2/0xe0 mm/kasan/report.c:595  check_region_inline mm/kasan/generic.c:-1 [inline]  kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200  instrument_atomic_read include/linux/instrumented.h:82 [inline]  atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]  __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719  __udpv6_queue_rcv_skb net/ipv6/udp.c:795 [inline]  udpv6_queue_rcv_one_skb+0xa2e/0x1ad0 net/ipv6/udp.c:906  udp6_unicast_rcv_skb+0x227/0x380 net/ipv6/udp.c:1064  ip6_protocol_deliver_rcu+0xe17/0x1540 net/ipv6/ip6_input.c:438  ip6_input_finish+0x191/0x350 net/ipv6/ip6_input.c:489  NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318  ip6_input+0x16c/0x2b0 net/ipv6/ip6_input.c:500  NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318  __netif_receive_skb_one_core net/core/dev.c:6149 [inline]  __netif_receive_skb+0xd3/0x370 net/core/dev.c:6262  process_backlog+0x4d6/0x1160 net/core/dev.c:6614  __napi_poll+0xae/0x320 net/core/dev.c:7678  napi_poll net/core/dev.c:7741 [inline]  net_rx_action+0x60d/0xdc0 net/core/dev.c:7893  handle_softirqs+0x209/0x8d0 kernel/softirq.c:622  do_softirq+0x52/0x90 kernel/softirq.c:523  \u003c/IRQ\u003e  \u003cTASK\u003e  __local_bh_enable_ip+0xe7/0x120 kernel/softirq.c:450  local_bh_enable include/linux/bottom_half.h:33 [inline]  rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]  __dev_queue_xmit+0x109c/0x2dc0 net/core/dev.c:4856  __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]  ip6_finish_output+0x158/0x4e0 net/ipv6/ip6_output.c:219  NF_HOOK_COND include/linux/netfilter.h:307 [inline]  ip6_output+0x342/0x580 net/ipv6/ip6_output.c:246  ip6_send_skb+0x1d7/0x3c0 net/ipv6/ip6_output.c:1984  udp_v6_send_skb+0x9a5/0x1770 net/ipv6/udp.c:1442  udp_v6_push_pending_frames+0xa2/0x140 net/ipv6/udp.c:1469  udpv6_sendmsg+0xfe0/0x2830 net/ipv6/udp.c:1759  sock_sendmsg_nosec net/socket.c:727 [inline]  __sock_sendmsg+0xe5/0x270 net/socket.c:742  __sys_sendto+0x3eb/0x580 net/socket.c:2206  __do_sys_sendto net/socket.c:2213 [inline]  __se_sys_sendto net/socket.c:2209 [inline]  __x64_sys_sendto+0xde/0x100 net/socket.c:2209  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]  do_syscall_64+0xd2/0xf20 arch/x86/entry/syscall_64.c:94  entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f67b4d9c629 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 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f67b5c98028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f67b5015fa0 RCX: 00007f67b4d9c629 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f67b4e32b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000040000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f67b5016038 R14: 00007f67b5015fa0 R15: 00007ffe3cb66dd8  \u003c/TASK\u003e","modified":"2026-09-14T17:03:37.592754421Z","published":"2026-05-06T12:16:34.540Z","upstream":["CVE-2026-43164"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-43164"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.19.6-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+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","6.12.85-1","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","6.12.90-1","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","6.13.10-1~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","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43164.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}