CVE-2026-45890 (GCVE-0-2026-45890)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17
VLAI
Title
xen-netback: reject zero-queue configuration from guest
Summary
In the Linux kernel, the following vulnerability has been resolved: xen-netback: reject zero-queue configuration from guest A malicious or buggy Xen guest can write "0" to the xenbus key "multi-queue-num-queues". The connect() function in the backend only validates the upper bound (requested_num_queues > xenvif_max_queues) but not zero, allowing requested_num_queues=0 to reach vzalloc(array_size(0, sizeof(struct xenvif_queue))), which triggers WARN_ON_ONCE(!size) in __vmalloc_node_range(). On systems with panic_on_warn=1, this allows a guest-to-host denial of service. The Xen network interface specification requires the queue count to be "greater than zero". Add a zero check to match the validation already present in xen-blkback, which has included this guard since its multi-queue support was added.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < 2993e0f904c45f8af12917344bb1cac7ccd05a60 (git)
Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < 787bfa423228c4b02ba3368128f625d579085353 (git)
Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < ce66d6786de45b7ed9cbbdc0988054bf09e58f54 (git)
Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < 88b0fced1bbbfdb356a007592604008ffc93a6a1 (git)
Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < ec4859ac5c933e3315543a61adc1ca4358006a41 (git)
Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < 654780dee9eae419e1648ea58462c4efe54518fa (git)
Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < d99f69ddc70fd9f4b8148add62209a1a8eb5c615 (git)
Affected: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d , < 6d1dc8014334c7fb25719999bca84d811e60a559 (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/xen-netback/xenbus.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "3.16"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.15.202",
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            },
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              "lessThanOrEqual": "6.6.*",
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              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
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              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
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      "descriptions": [
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          "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 \u003e 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"
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      "title": "xen-netback: reject zero-queue configuration from guest",
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    "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"
  },
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      "date": "2026-06-05",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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