{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-38264",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T04:51:23.997Z",
        "datePublished": "2025-07-09T10:42:38.602Z",
        "dateUpdated": "2026-08-05T12:00:51.571Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:00:51.571Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: sanitize request list handling\n\nValidate the request in nvme_tcp_handle_r2t() to ensure it's not part of\nany list, otherwise a malicious R2T PDU might inject a loop in request\nlist processing."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 9.8,
                        "baseSeverity": "CRITICAL"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - The vulnerable code is the NVMe-over-TCP host driver's PDU receive path, parsing an R2T PDU sent by a remote NVMe-oF target over TCP (port 4420); the malicious input arrives purely over the network from a compromised/rogue target or an on-path attacker.\nAC:L - The target fully controls PDU content and timing — placing two R2T PDUs for the same command_id in a single TCP segment guarantees both are processed inside one nvme_tcp_recv_skb() pass with no send-path progress between them, creating the llist cycle deterministically with no race to win and no memory-layout dependency.\nPR:N - NVMe/TCP requires no authentication by default (TLS and DH-HMAC-CHAP are optional, off in stock configs), so the remote peer needs zero privileges or credentials on the victim host — it simply answers I/O it is already being sent.\nUI:N - No victim action is required; once the host is connected to the target, ordinary filesystem/block I/O generates the in-flight commands and the malicious target triggers the bug on its own by replying with duplicate R2T PDUs.\nS:U - The corruption and the resulting hang are confined to the host kernel's own memory and scheduling authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Beyond the list corruption, duplicate queueing lets the RX path reset req->state/offset/pdu_len while the TX path is consuming the request, desynchronizing req->iter so nvme_tcp_req_cur_page() reads past the bvec array and sock_sendmsg() splices unintended kernel pages directly to the attacker-controlled socket.\nI:H - Attacker-controlled input produces kernel linked-list pointer corruption (double llist_add plus repeated list_add of an already-linked entry into send_list) and lets an in-flight request's PDU header, ttag, and iterator state be rewritten mid-transfer, which is memory/state corruption leverageable for further control over kernel structures.\nA:H - The injected cycle makes nvme_tcp_process_req_list() spin forever in the nvme_tcp_wq kworker while holding queue->send_mutex with no cond_resched(), producing a CPU soft lockup, RCU stalls, and a permanently wedged storage queue — a deterministic, unauthenticated remote kernel hang."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/nvme/host/tcp.c"
                    ],
                    "versions": [
                        {
                            "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
                            "lessThan": "78a4adcd3fedb0728436e8094848ebf4c6bae006",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
                            "lessThan": "f054ea62598197714a6ca7b3b387a027308f8b13",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
                            "lessThan": "0bf04c874fcb1ae46a863034296e4b33d8fbd66c",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/nvme/host/tcp.c"
                    ],
                    "versions": [
                        {
                            "version": "5.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.36",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.15.5",
                            "lessThanOrEqual": "6.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16",
                            "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": "5.0",
                                    "versionEndExcluding": "6.12.36"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.0",
                                    "versionEndExcluding": "6.15.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.0",
                                    "versionEndExcluding": "6.16"
                                }
                            ]
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/78a4adcd3fedb0728436e8094848ebf4c6bae006"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f054ea62598197714a6ca7b3b387a027308f8b13"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0bf04c874fcb1ae46a863034296e4b33d8fbd66c"
                }
            ],
            "title": "nvme-tcp: sanitize request list handling",
            "x_generator": {
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}