{"api_version":"1","generated_at":"2026-05-29T20:09:04+00:00","cve":"CVE-2026-45890","urls":{"html":"https://cve.report/CVE-2026-45890","api":"https://cve.report/api/cve/CVE-2026-45890.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45890","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45890"},"summary":{"title":"xen-netback: reject zero-queue configuration from guest","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:03","updated_at":"2026-05-27 14:48:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353","name":"https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54","name":"https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615","name":"https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa","name":"https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60","name":"https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559","name":"https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1","name":"https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41","name":"https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45890","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45890","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 2993e0f904c45f8af12917344bb1cac7ccd05a60 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 787bfa423228c4b02ba3368128f625d579085353 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d ce66d6786de45b7ed9cbbdc0988054bf09e58f54 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d 88b0fced1bbbfdb356a007592604008ffc93a6a1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.202 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.165 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.128 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.75 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.14 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.4 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"45890","cve":"CVE-2026-45890","epss":"0.000240000","percentile":"0.073770000","score_date":"2026-05-28","updated_at":"2026-05-29 00:13:15"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/xen-netback/xenbus.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2993e0f904c45f8af12917344bb1cac7ccd05a60","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"},{"lessThan":"787bfa423228c4b02ba3368128f625d579085353","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"},{"lessThan":"ce66d6786de45b7ed9cbbdc0988054bf09e58f54","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"},{"lessThan":"88b0fced1bbbfdb356a007592604008ffc93a6a1","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"},{"lessThan":"ec4859ac5c933e3315543a61adc1ca4358006a41","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"},{"lessThan":"654780dee9eae419e1648ea58462c4efe54518fa","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"},{"lessThan":"d99f69ddc70fd9f4b8148add62209a1a8eb5c615","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"},{"lessThan":"6d1dc8014334c7fb25719999bca84d811e60a559","status":"affected","version":"8d3d53b3e43363e79ab9a9ecc149b06c1314b25d","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/xen-netback/xenbus.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.16"},{"lessThan":"3.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.252","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.202","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.165","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.128","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.75","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.14","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.252","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.202","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.165","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.128","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.75","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.14","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.4","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"3.16","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-05-27T12:17:01.466Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-45890","datePublished":"2026-05-27T12:17:01.466Z","dateReserved":"2026-05-13T15:03:33.083Z","dateUpdated":"2026-05-27T12:17:01.466Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:03","lastModifiedDate":"2026-05-27 14:48:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"45890","Ordinal":"1","Title":"xen-netback: reject zero-queue configuration from guest","CVE":"CVE-2026-45890","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"45890","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"xen-netback: reject zero-queue configuration from guest"}]}}}