{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-45890",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-13T15:03:33.083Z",
        "datePublished": "2026-05-27T12:17:01.466Z",
        "dateUpdated": "2026-05-27T12:17:01.466Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-27T12:17:01.466Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: reject zero-queue configuration from guest\n\nA malicious or buggy Xen guest can write \"0\" to the xenbus key\n\"multi-queue-num-queues\". The connect() function in the backend only\nvalidates the upper bound (requested_num_queues > xenvif_max_queues)\nbut not zero, allowing requested_num_queues=0 to reach\nvzalloc(array_size(0, sizeof(struct xenvif_queue))), which triggers\nWARN_ON_ONCE(!size) in __vmalloc_node_range().\n\nOn systems with panic_on_warn=1, this allows a guest-to-host denial\nof service.\n\nThe Xen network interface specification requires\nthe queue count to be \"greater than zero\".\n\nAdd a zero check to match the validation already present\nin xen-blkback, which has included this\nguard since its multi-queue support was added."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/xen-netback/xenbus.c"
                    ],
                    "versions": [
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "2993e0f904c45f8af12917344bb1cac7ccd05a60",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "787bfa423228c4b02ba3368128f625d579085353",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "ce66d6786de45b7ed9cbbdc0988054bf09e58f54",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "88b0fced1bbbfdb356a007592604008ffc93a6a1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "ec4859ac5c933e3315543a61adc1ca4358006a41",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "654780dee9eae419e1648ea58462c4efe54518fa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "d99f69ddc70fd9f4b8148add62209a1a8eb5c615",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d",
                            "lessThan": "6d1dc8014334c7fb25719999bca84d811e60a559",
                            "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/net/xen-netback/xenbus.c"
                    ],
                    "versions": [
                        {
                            "version": "3.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.252",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.202",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.165",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.128",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.75",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.14",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.4",
                            "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": "3.16",
                                    "versionEndExcluding": "5.10.252"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.16",
                                    "versionEndExcluding": "5.15.202"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.16",
                                    "versionEndExcluding": "6.1.165"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.16",
                                    "versionEndExcluding": "6.6.128"
                                },
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                                    "versionStartIncluding": "3.16",
                                    "versionEndExcluding": "6.12.75"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionStartIncluding": "3.16",
                                    "versionEndExcluding": "6.19.4"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.16",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60"
                },
                {
                    "url": "https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54"
                },
                {
                    "url": "https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41"
                },
                {
                    "url": "https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559"
                }
            ],
            "title": "xen-netback: reject zero-queue configuration from guest",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}