ubuntu-cve-2026-62437
Vulnerability from osv_ubuntu
Published
2026-09-08 12:00
Modified
2026-09-14 08:35
Summary
Details
When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be. A HVM guest with one or more PCI devices assigned can cause a memory leak in the hypervisor, possibly leading to Denial of Service (DoS) of the entire host. All Xen versions from at least 3.2 onwards are affected.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxen-4.6",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "libxenstore3.0",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.4-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.4-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.4-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.5-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.5-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.5-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.6-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.6-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-hypervisor-4.6-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-system-amd64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-system-arm64",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-system-armhf",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-utils-4.6",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xen-utils-common",
"binary_version": "4.6.5-0ubuntu1.4"
},
{
"binary_name": "xenstore-utils",
"binary_version": "4.6.5-0ubuntu1.4"
}
]
},
"package": {
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"name": "xen",
"purl": "pkg:deb/ubuntu/xen@4.6.5-0ubuntu1.4?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.5.1-0ubuntu1",
"4.5.1-0ubuntu2",
"4.6.0-1ubuntu1",
"4.6.0-1ubuntu2",
"4.6.0-1ubuntu4",
"4.6.0-1ubuntu4.1",
"4.6.0-1ubuntu4.2",
"4.6.0-1ubuntu4.3",
"4.6.5-0ubuntu1",
"4.6.5-0ubuntu1.1",
"4.6.5-0ubuntu1.2",
"4.6.5-0ubuntu1.4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxen-4.9",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "libxenstore3.0",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.6-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.6-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.6-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.7-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.7-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.7-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.8-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.8-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.8-armhf",
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},
{
"binary_name": "xen-hypervisor-4.9-amd64",
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},
{
"binary_name": "xen-hypervisor-4.9-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-hypervisor-4.9-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-system-amd64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-system-arm64",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-system-armhf",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-utils-4.9",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xen-utils-common",
"binary_version": "4.9.2-0ubuntu1"
},
{
"binary_name": "xenstore-utils",
"binary_version": "4.9.2-0ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "xen",
"purl": "pkg:deb/ubuntu/xen@4.9.2-0ubuntu1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.9.0-0ubuntu3",
"4.9.0-0ubuntu4",
"4.9.2-0ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
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"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxendevicemodel1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenevtchn1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenforeignmemory1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxengnttab1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenmisc4.11",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxenstore3.0",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxentoolcore1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "libxentoollog1",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.11-amd64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.11-arm64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.11-armhf",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.9-amd64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.9-arm64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-4.9-armhf",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-hypervisor-common",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-system-amd64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-system-arm64",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-system-armhf",
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},
{
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},
{
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},
{
"binary_name": "xenstore-utils",
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}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "xen",
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},
"ranges": [
{
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{
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],
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}
],
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"4.9.2-0ubuntu6",
"4.9.2-0ubuntu7",
"4.11.3+24-g14b62ab3e5-1ubuntu1",
"4.11.3+24-g14b62ab3e5-1ubuntu2",
"4.11.3+24-g14b62ab3e5-1ubuntu2.2",
"4.11.3+24-g14b62ab3e5-1ubuntu2.3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxencall1",
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},
{
"binary_name": "libxendevicemodel1",
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},
{
"binary_name": "libxenevtchn1",
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},
{
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{
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{
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{
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},
{
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{
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},
{
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{
"binary_name": "xen-hypervisor-4.16-amd64",
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},
{
"binary_name": "xen-hypervisor-4.16-arm64",
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{
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{
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},
{
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},
{
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},
"package": {
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"4.16.0-1~ubuntu2",
"4.16.0-1~ubuntu2.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "libxendevicemodel1t64",
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},
{
"binary_name": "libxenevtchn1t64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "libxenforeignmemory1t64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "libxengnttab1t64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "libxenhypfs1t64",
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{
"binary_name": "libxenmisc4.17t64",
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},
{
"binary_name": "libxenstore4t64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "libxentoolcore1t64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "libxentoollog1t64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "xen-hypervisor-4.17-amd64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "xen-hypervisor-4.17-arm64",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
"binary_name": "xen-hypervisor-4.17-armhf",
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},
{
"binary_name": "xen-hypervisor-common",
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},
{
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"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
},
{
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},
{
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"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
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{
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{
"binary_name": "xen-utils-common",
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{
"binary_name": "xenstore-utils",
"binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3"
}
]
},
"package": {
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"name": "xen",
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},
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{
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"4.17.2+55-g0b56bed864-1",
"4.17.2+76-ge1f9cb16e2-1",
"4.17.2+76-ge1f9cb16e2-1ubuntu1",
"4.17.3+10-g091466ba55-1",
"4.17.3+10-g091466ba55-1.1ubuntu2",
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},
{
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{
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{
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},
{
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},
{
"binary_name": "libxenforeignmemory1",
"binary_version": "4.20.2+7-g1badcf5035-2build2"
},
{
"binary_name": "libxengnttab1",
"binary_version": "4.20.2+7-g1badcf5035-2build2"
},
{
"binary_name": "libxenhypfs1",
"binary_version": "4.20.2+7-g1badcf5035-2build2"
},
{
"binary_name": "libxenmisc4.20",
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{
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{
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{
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{
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{
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{
"binary_name": "xenstore-utils",
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]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "xen",
"purl": "pkg:deb/ubuntu/xen@4.20.2+7-g1badcf5035-2build2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.20.0+68-g35cb38b222-1",
"4.20.2+7-g1badcf5035-2",
"4.20.2+7-g1badcf5035-2build2"
]
}
],
"aliases": [],
"details": "When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be. A HVM guest with one or more PCI devices assigned can cause a memory leak in the hypervisor, possibly leading to Denial of Service (DoS) of the entire host. All Xen versions from at least 3.2 onwards are affected.",
"id": "UBUNTU-CVE-2026-62437",
"modified": "2026-09-14T08:35:28Z",
"published": "2026-09-08T12:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-62437"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62437"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-62437"
]
}
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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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