CVE-2026-45890 (GCVE-0-2026-45890)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17
VLAI
EPSS
VEX
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)
Assigner
References
8 references
Impacted products
2 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) |
guessed | |
| 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 |
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{
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},
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]
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"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 \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"
},
"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": {
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}
}
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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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-45890",
"date": "2026-09-14",
"epss": "0.00123",
"percentile": "0.02375"
},
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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 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"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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