High
xen — security advisory
grant table v2 status pages may remain accessible after de-allocation (take two) Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes. This bug was fortuitously fixed by code cleanup in Xen 4.14, and backported to security-supported Xen branches as a prerequisite of the fix for XSA-378.
- Products
- xen
- Affected versions
- 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, 4.11.4+24-gddaaccbbab-1ubuntu2, 4.16.0-1~ubuntu2, 4.16.0-1~ubuntu2.1, 4.17.2+55-g0b56bed864-1, 4.17.2+76-ge1f9cb16e2-1, 4.17.2+76-ge1f9cb16e2-1ubuntu1, 4.17.2-1, 4.17.3+10-g091466ba55-1, 4.17.3+10-g091466ba55-1.1ubuntu2, 4.17.3+10-g091466ba55-1.1ubuntu3, 4.20.0+68-g35cb38b222-1, 4.20.0-1ubuntu1, 4.20.2+37-g61ff35323e-1ubuntu1, 4.20.2+7-g1badcf5035-2, 4.20.2+7-g1badcf5035-2build2, 4.20.3+127-gc42374a105-1, 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, 4.9.0-0ubuntu3, 4.9.0-0ubuntu4, 4.9.2-0ubuntu1, 4.9.2-0ubuntu2, 4.9.2-0ubuntu6, 4.9.2-0ubuntu7
- Fixed versions
- Not specified
- CVEs
- CVE-2021-28703
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:37 UTC · Revision 1
Source evidence
grant table v2 status pages may remain accessible after de-allocation (take two) Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes. This bug was fortuitously fixed by code cleanup in Xen 4.14, and backported to security-supported Xen branches as a prerequisite of the fix for XSA-378.
osv:UBUNTU-CVE-2021-28703
xen
Fixed versions: Not specified
xen
Fixed versions: Not specified
xen
Fixed versions: Not specified
xen
Fixed versions: Not specified
xen
Fixed versions: Not specified
xen
Fixed versions: Not specified
xen
Fixed versions: Not specified
xen
Fixed versions: Not specified
Complete source record
{
"id": "e3b0dd15247bf7611f468ac5d9fc9290aecf36a7f3df79c1f6f6af66aaebefa5",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-28703",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-28703",
"summary": "grant table v2 status pages may remain accessible after de-allocation (take two) Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes. This bug was fortuitously fixed by code cleanup in Xen 4.14, and backported to security-supported Xen branches as a prerequisite of the fix for XSA-378.",
"evidence": "osv:UBUNTU-CVE-2021-28703",
"products": [
{
"name": {
"value": "xen",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.5.1-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1-0ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-1ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-1ubuntu4",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-1ubuntu4.1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-1ubuntu4.2",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-1ubuntu4.3",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.5-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.5-0ubuntu1.1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.5-0ubuntu1.2",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.5-0ubuntu1.4",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
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"affected_versions": [
{
"value": "4.9.0-0ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "4.9.0-0ubuntu4",
"evidence": "/affected/1/versions"
},
{
"value": "4.9.2-0ubuntu1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.9.2-0ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "4.9.2-0ubuntu6",
"evidence": "/affected/2/versions"
},
{
"value": "4.9.2-0ubuntu7",
"evidence": "/affected/2/versions"
},
{
"value": "4.11.3+24-g14b62ab3e5-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "4.11.3+24-g14b62ab3e5-1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "4.11.3+24-g14b62ab3e5-1ubuntu2.2",
"evidence": "/affected/2/versions"
},
{
"value": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.11.4+24-gddaaccbbab-1ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "4.16.0-1~ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "4.16.0-1~ubuntu2.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.17.2-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.17.2+55-g0b56bed864-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.17.2+76-ge1f9cb16e2-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.17.2+76-ge1f9cb16e2-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "4.17.3+10-g091466ba55-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.17.3+10-g091466ba55-1.1ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "4.17.3+10-g091466ba55-1.1ubuntu3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.20.0-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "4.20.0+68-g35cb38b222-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.20.2+7-g1badcf5035-2build2",
"evidence": "/affected/6/versions"
},
{
"value": "4.20.2+37-g61ff35323e-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "4.20.3+127-gc42374a105-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.20.0+68-g35cb38b222-1",
"evidence": "/affected/7/versions"
},
{
"value": "4.20.2+7-g1badcf5035-2",
"evidence": "/affected/7/versions"
},
{
"value": "4.20.2+7-g1badcf5035-2build2",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2021-28703",
"aliases": [
"UBUNTU-CVE-2021-28703"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xen",
"purl": "pkg:deb/ubuntu/xen?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28703.json"
},
"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",
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{
"binary_name": "xen-system-armhf",
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{
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{
"binary_name": "xen-utils-common",
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},
{
"binary_name": "xenstore-utils",
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}
},
{
"ranges": [
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}
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}
],
"package": {
"name": "xen",
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"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"4.9.0-0ubuntu3",
"4.9.0-0ubuntu4",
"4.9.2-0ubuntu1"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
"binary_name": "libxenstore3.0",
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{
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{
"binary_name": "xen-hypervisor-4.6-arm64",
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{
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{
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{
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},
{
"binary_name": "xen-hypervisor-4.7-armhf",
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{
"binary_name": "xen-hypervisor-4.8-amd64",
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},
{
"binary_name": "xen-hypervisor-4.8-arm64",
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},
{
"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",
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},
{
"binary_name": "xen-hypervisor-4.9-armhf",
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},
{
"binary_name": "xen-system-amd64",
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},
{
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{
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{
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},
{
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},
{
"binary_name": "xenstore-utils",
"binary_version": "4.9.2-0ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xen",
"purl": "pkg:deb/ubuntu/xen?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
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"4.11.3+24-g14b62ab3e5-1ubuntu2",
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"4.11.3+24-g14b62ab3e5-1ubuntu2.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28703.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "libxendevicemodel1",
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},
{
"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",
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},
{
"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",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-utils-4.11",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xen-utils-common",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
},
{
"binary_name": "xenstore-utils",
"binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xen",
"purl": "pkg:deb/ubuntu/xen?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"4.11.4+24-gddaaccbbab-1ubuntu2",
"4.16.0-1~ubuntu2",
"4.16.0-1~ubuntu2.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28703.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxencall1",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxendevicemodel1",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxenevtchn1",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxenforeignmemory1",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxengnttab1",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxenhypfs1",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxenmisc4.16",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxenstore4",
"binary_version": "4.16.0-1~ubuntu2.1"
},
{
"binary_name": "libxentoolcore1",
"binary_version": "4.16.0-1~ubuntu2.1"
},
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"modified": "2026-10-17T12:57:13.406541971Z",
"provider": "osv",
"upstream": [
"CVE-2021-28703"
],
"references": [
"https://ubuntu.com/security/CVE-2021-28703",
"https://xenbits.xen.org/xsa/advisory-387.html",
"https://www.cve.org/CVERecord?id=CVE-2021-28703"
]
},
"related_cves": [
{
"value": "CVE-2021-28703",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356942,
"published_at": "2021-12-07T12:15:00+00:00"
}