{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43080",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43080"
  ],
  "published": "2026-05-06T07:41:37Z",
  "summary": "l2tp: Drop large packets with UDP encap",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: Drop large packets with UDP encap\n\nsyzbot reported a WARN on my patch series [1]. The actual issue is an\noverflow of 16-bit UDP length field, and it exists in the upstream code.\nMy series added a debug WARN with an overflow check that exposed the\nissue, that's why syzbot tripped on my patches, rather than on upstream\ncode.\n\nsyzbot's repro:\n\nr0 = socket$pppl2tp(0x18, 0x1, 0x1)\nr1 = socket$inet6_udp(0xa, 0x2, 0x0)\nconnect$inet6(r1, &(0x7f00000000c0)={0xa, 0x0, 0x0, @loopback, 0xfffffffc}, 0x1c)\nconnect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\\x00', '\\xff\\xff', @empty}}}}, 0x32)\nwritev(r0, &(0x7f0000000080)=[{&(0x7f0000000000)=\"ee\", 0x34000}], 0x1)\n\nIt basically sends an oversized (0x34000 bytes) PPPoL2TP packet with UDP\nencapsulation, and l2tp_xmit_core doesn't check for overflows when it\nassigns the UDP length field. The value gets trimmed to 16 bites.\n\nAdd an overflow check that drops oversized packets and avoids sending\npackets with trimmed UDP length to the wire.\n\nsyzbot's stack trace (with my patch applied):\n\nlen >= 65536u\nWARNING: ./include/linux/udp.h:38 at udp_set_len_short include/linux/udp.h:38 [inline], CPU#1: syz.0.17/5957\nWARNING: ./include/linux/udp.h:38 at l2tp_xmit_core net/l2tp/l2tp_core.c:1293 [inline], CPU#1: syz.0.17/5957\nWARNING: ./include/linux/udp.h:38 at l2tp_xmit_skb+0x1204/0x18d0 net/l2tp/l2tp_core.c:1327, CPU#1: syz.0.17/5957\nModules linked in:\nCPU: 1 UID: 0 PID: 5957 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nRIP: 0010:udp_set_len_short include/linux/udp.h:38 [inline]\nRIP: 0010:l2tp_xmit_core net/l2tp/l2tp_core.c:1293 [inline]\nRIP: 0010:l2tp_xmit_skb+0x1204/0x18d0 net/l2tp/l2tp_core.c:1327\nCode: 0f 0b 90 e9 21 f9 ff ff e8 e9 05 ec f6 90 0f 0b 90 e9 8d f9 ff ff e8 db 05 ec f6 90 0f 0b 90 e9 cc f9 ff ff e8 cd 05 ec f6 90 <0f> 0b 90 e9 de fa ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 4f\nRSP: 0018:ffffc90003d67878 EFLAGS: 00010293\nRAX: ffffffff8ad985e3 RBX: ffff8881a6400090 RCX: ffff8881697f0000\nRDX: 0000000000000000 RSI: 0000000000034010 RDI: 000000000000ffff\nRBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004\nR10: dffffc0000000000 R11: fffff520007acf00 R12: ffff8881baf20900\nR13: 0000000000034010 R14: ffff8881a640008e R15: ffff8881760f7000\nFS:  000055557e81f500(0000) GS:ffff8882a9467000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000200000033000 CR3: 00000001612f4000 CR4: 00000000000006f0\nCall Trace:\n <TASK>\n pppol2tp_sendmsg+0x40a/0x5f0 net/l2tp/l2tp_ppp.c:302\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg net/socket.c:742 [inline]\n sock_write_iter+0x503/0x550 net/socket.c:1195\n do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1\n vfs_writev+0x33c/0x990 fs/read_write.c:1059\n do_writev+0x154/0x2e0 fs/read_write.c:1105\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f636479c629\nCode: 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 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007ffffd4241c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014\nRAX: ffffffffffffffda RBX: 00007f6364a15fa0 RCX: 00007f636479c629\nRDX: 0000000000000001 RSI: 0000200000000080 RDI: 0000000000000003\nRBP: 00007f6364832b39 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f6364a15fac R14: 00007f6364a15fa0 R15: 00007f6364a15fa0\n </TASK>\n\n[1]: https://lore.kernel.org/all/20260226201600.222044-1-alice.kernel@fastmail.im/",
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        "name": "linux"
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