{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43164",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:55.990Z",
        "datePublished": "2026-05-06T11:27:41.928Z",
        "dateUpdated": "2026-08-05T12:26:15.706Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:26:15.706Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb().\n\nsyzbot reported null-ptr-deref of udp_sk(sk)->udp_prod_queue. [0]\n\nSince the cited commit, udp_lib_init_sock() can fail, as can\nudp_init_sock() and udpv6_init_sock().\n\nLet's handle the error in udplite_sk_init() and udplitev6_sk_init().\n\n[0]:\nBUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:82 [inline]\nBUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]\nBUG: KASAN: null-ptr-deref in __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719\nRead of size 4 at addr 0000000000000008 by task syz.2.18/2944\n\nCPU: 1 UID: 0 PID: 2944 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPTLAZY\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nCall Trace:\n <IRQ>\n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n kasan_report+0xa2/0xe0 mm/kasan/report.c:595\n check_region_inline mm/kasan/generic.c:-1 [inline]\n kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200\n instrument_atomic_read include/linux/instrumented.h:82 [inline]\n atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]\n __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719\n __udpv6_queue_rcv_skb net/ipv6/udp.c:795 [inline]\n udpv6_queue_rcv_one_skb+0xa2e/0x1ad0 net/ipv6/udp.c:906\n udp6_unicast_rcv_skb+0x227/0x380 net/ipv6/udp.c:1064\n ip6_protocol_deliver_rcu+0xe17/0x1540 net/ipv6/ip6_input.c:438\n ip6_input_finish+0x191/0x350 net/ipv6/ip6_input.c:489\n NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318\n ip6_input+0x16c/0x2b0 net/ipv6/ip6_input.c:500\n NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318\n __netif_receive_skb_one_core net/core/dev.c:6149 [inline]\n __netif_receive_skb+0xd3/0x370 net/core/dev.c:6262\n process_backlog+0x4d6/0x1160 net/core/dev.c:6614\n __napi_poll+0xae/0x320 net/core/dev.c:7678\n napi_poll net/core/dev.c:7741 [inline]\n net_rx_action+0x60d/0xdc0 net/core/dev.c:7893\n handle_softirqs+0x209/0x8d0 kernel/softirq.c:622\n do_softirq+0x52/0x90 kernel/softirq.c:523\n </IRQ>\n <TASK>\n __local_bh_enable_ip+0xe7/0x120 kernel/softirq.c:450\n local_bh_enable include/linux/bottom_half.h:33 [inline]\n rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]\n __dev_queue_xmit+0x109c/0x2dc0 net/core/dev.c:4856\n __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]\n ip6_finish_output+0x158/0x4e0 net/ipv6/ip6_output.c:219\n NF_HOOK_COND include/linux/netfilter.h:307 [inline]\n ip6_output+0x342/0x580 net/ipv6/ip6_output.c:246\n ip6_send_skb+0x1d7/0x3c0 net/ipv6/ip6_output.c:1984\n udp_v6_send_skb+0x9a5/0x1770 net/ipv6/udp.c:1442\n udp_v6_push_pending_frames+0xa2/0x140 net/ipv6/udp.c:1469\n udpv6_sendmsg+0xfe0/0x2830 net/ipv6/udp.c:1759\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0xe5/0x270 net/socket.c:742\n __sys_sendto+0x3eb/0x580 net/socket.c:2206\n __do_sys_sendto net/socket.c:2213 [inline]\n __se_sys_sendto net/socket.c:2209 [inline]\n __x64_sys_sendto+0xde/0x100 net/socket.c:2209\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd2/0xf20 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0033:0x7f67b4d9c629\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:00007f67b5c98028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\nRAX: ffffffffffffffda RBX: 00007f67b5015fa0 RCX: 00007f67b4d9c629\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\nRBP: 00007f67b4e32b39 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000040000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f67b5016038 R14: 00007f67b5015fa0 R15: 00007ffe3cb66dd8\n </TASK>"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - Received IPv4/IPv6 UDP-Lite packets traverse the network input path into udplite_rcv/udplitev6_rcv and ultimately __udp_enqueue_schedule_skb(). A remote unauthenticated sender can reach this path by sending UDP-Lite packets to an affected UDP-Lite socket.\nAC:L - There is no race or difficult packet shaping requirement; once the UDP-Lite socket exists with the masked initialization failure, a packet deterministically dereferences the NULL udp_prod_queue. The allocation-failure precondition is influenceable via memory pressure, and uncertainty is scored toward lower complexity.\nPR:N - The receive path has no authentication or privilege gate for incoming UDP-Lite packets. Creating SOCK_DGRAM UDP-Lite sockets is also not subject to the raw-socket CAP_NET_RAW check, but the network trigger itself requires no privileges.\nUI:N - No victim user action is required after the affected UDP-Lite socket is present. The attacker only sends traffic to the socket.\nS:U - The crash occurs inside the kernel networking stack and affects the same security authority. There is no VM escape, sandbox boundary crossing, or separate security scope.\nC:N - The fault is a NULL/low-address pointer read of udp_prod_queue->rmem_alloc. This is a pure crash condition and does not provide an information disclosure primitive.\nI:N - The vulnerable operation is a read from a NULL-derived pointer before any write through that pointer. There is no memory corruption or data modification primitive.\nA:H - The NULL pointer dereference in softirq receive processing can produce a kernel oops/panic and deny service. It is repeatedly triggerable by sending packets to the affected socket."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/udplite.c",
                        "net/ipv6/udplite.c"
                    ],
                    "versions": [
                        {
                            "version": "b650bf0977d34c52befb31a9fa711534e11b220f",
                            "lessThan": "f27030ac5bef47d997cfac05a3d188aa69f4df7f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b650bf0977d34c52befb31a9fa711534e11b220f",
                            "lessThan": "0f13fa087ead642ea1eb5fdb6eb092c913ef06b7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b650bf0977d34c52befb31a9fa711534e11b220f",
                            "lessThan": "470c7ca2b4c3e3a51feeb952b7f97a775b5c49cd",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/udplite.c",
                        "net/ipv6/udplite.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.16",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.6",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "6.18.16"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "6.19.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f27030ac5bef47d997cfac05a3d188aa69f4df7f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0f13fa087ead642ea1eb5fdb6eb092c913ef06b7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/470c7ca2b4c3e3a51feeb952b7f97a775b5c49cd"
                }
            ],
            "title": "udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb().",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}