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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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d99f69ddc70fd9f4b8148add62209a1a8eb5c615"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ec4859ac5c933e3315543a61adc1ca4358006a41"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:39:58+00:00",
      "cve": "CVE-2026-45890",
      "id": "CVE-2026-45890",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xen-netback: reject zero-queue configuration from guest",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45890.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-27T17:00:39Z",
      "cve": "CVE-2026-45890",
      "id": "CVE-2026-45890",
      "initial_release_date": "2026-05-28T03:56:47Z",
      "product_status:known_affected": "297",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45890",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45890.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





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.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.