CVE-2026-45890 (GCVE-0-2026-45890)
Vulnerability from cvelistv5
Published
2026-05-27 12:17
Modified
2026-05-27 12:17
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d Version: 8d3d53b3e43363e79ab9a9ecc149b06c1314b25d |
||
{
"containers": {
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"programFiles": [
"drivers/net/xen-netback/xenbus.c"
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"versions": [
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"version": "3.16"
},
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.252",
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},
{
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"version": "5.15.202",
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},
{
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{
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{
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{
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"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"negate": false,
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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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}
}
},
"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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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