{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8d3d53b3e43363e79ab9a9ecc149b06c1314b25d"
            },
            {
              "fixed": "2993e0f904c45f8af12917344bb1cac7ccd05a60"
            },
            {
              "fixed": "787bfa423228c4b02ba3368128f625d579085353"
            },
            {
              "fixed": "ce66d6786de45b7ed9cbbdc0988054bf09e58f54"
            },
            {
              "fixed": "88b0fced1bbbfdb356a007592604008ffc93a6a1"
            },
            {
              "fixed": "ec4859ac5c933e3315543a61adc1ca4358006a41"
            },
            {
              "fixed": "654780dee9eae419e1648ea58462c4efe54518fa"
            },
            {
              "fixed": "d99f69ddc70fd9f4b8148add62209a1a8eb5c615"
            },
            {
              "fixed": "6d1dc8014334c7fb25719999bca84d811e60a559"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.16.0"
            },
            {
              "fixed": "5.10.252"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.202"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45890.json"
  },
  "details": "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.",
  "id": "CVE-2026-45890",
  "modified": "2026-07-08T05:38:15.517145248Z",
  "published": "2026-05-27T12:17:01.466Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2993e0f904c45f8af12917344bb1cac7ccd05a60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/654780dee9eae419e1648ea58462c4efe54518fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d1dc8014334c7fb25719999bca84d811e60a559"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/787bfa423228c4b02ba3368128f625d579085353"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88b0fced1bbbfdb356a007592604008ffc93a6a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce66d6786de45b7ed9cbbdc0988054bf09e58f54"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45890.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45890"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "xen-netback: reject zero-queue configuration from guest"
}