Medium
amd64-microcode — security advisory
Improper access control in secure encrypted virtualization (SEV) could allow a privileged attacker to write to the reverse map page (RMP) during secure nested paging (SNP) initialization, potentially resulting in a loss of guest memory confidentiality and integrity.
- Products
- amd64-microcode
- Affected versions
- 3.20230808.1.1ubuntu1, 3.20231019.1ubuntu1, 3.20231019.1ubuntu2, 3.20231019.1ubuntu2.1, 3.20240820.1ubuntu1, 3.20250311.1ubuntu0.24.04.1, 3.20250311.1ubuntu1, 3.20250708.1ubuntu1, 3.20250708.1ubuntu2, 3.20251202.1ubuntu0.24.04.1, 3.20251202.1ubuntu0.25.10.1, 3.20251202.1ubuntu1, 3.20251202.1ubuntu2
- Fixed versions
- Not specified
- CVEs
- CVE-2025-29939
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:47 UTC · Revision 1
Source evidence
Improper access control in secure encrypted virtualization (SEV) could allow a privileged attacker to write to the reverse map page (RMP) during secure nested paging (SNP) initialization, potentially resulting in a loss of guest memory confidentiality and integrity.
osv:UBUNTU-CVE-2025-29939
amd64-microcode
Fixed versions: Not specified
amd64-microcode
Fixed versions: Not specified
amd64-microcode
Fixed versions: Not specified
amd64-microcode
Fixed versions: Not specified
Complete source record
{
"id": "508b0f9d6490efd7a14ecada0fba670610b685f615ddd88b8c304fa92fb01fc1",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-29939",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-29939",
"summary": "Improper access control in secure encrypted virtualization (SEV) could allow a privileged attacker to write to the reverse map page (RMP) during secure nested paging (SNP) initialization, potentially resulting in a loss of guest memory confidentiality and integrity.",
"evidence": "osv:UBUNTU-CVE-2025-29939",
"products": [
{
"name": {
"value": "amd64-microcode",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.20230808.1.1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "3.20231019.1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "3.20231019.1ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "3.20231019.1ubuntu2.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.20250311.1ubuntu0.24.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.20251202.1ubuntu0.24.04.1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
},
{
"value": "3.20250708.1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "3.20251202.1ubuntu0.25.10.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "amd64-microcode",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.20251202.1ubuntu2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "amd64-microcode",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.20250708.1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "3.20250708.1ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "3.20251202.1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "3.20251202.1ubuntu2",
"evidence": "/affected/3/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2025-29939",
"aliases": [
"UBUNTU-CVE-2025-29939"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "amd64-microcode",
"purl": "pkg:deb/ubuntu/amd64-microcode?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"3.20230808.1.1ubuntu1",
"3.20231019.1ubuntu1",
"3.20231019.1ubuntu2",
"3.20231019.1ubuntu2.1",
"3.20250311.1ubuntu0.24.04.1",
"3.20251202.1ubuntu0.24.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-29939.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "amd64-microcode",
"binary_version": "3.20251202.1ubuntu0.24.04.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "amd64-microcode",
"purl": "pkg:deb/ubuntu/amd64-microcode?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"3.20240820.1ubuntu1",
"3.20250311.1ubuntu1",
"3.20250708.1ubuntu1",
"3.20251202.1ubuntu0.25.10.1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "amd64-microcode",
"binary_version": "3.20251202.1ubuntu0.25.10.1"
}
]
}
},
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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],
"package": {
"name": "amd64-microcode",
"purl": "pkg:deb/ubuntu/amd64-microcode?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"3.20251202.1ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-29939.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "amd64-microcode",
"binary_version": "3.20251202.1ubuntu2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "amd64-microcode",
"purl": "pkg:deb/ubuntu/amd64-microcode?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.20250708.1ubuntu1",
"3.20250708.1ubuntu2",
"3.20251202.1ubuntu1",
"3.20251202.1ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-29939.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "amd64-microcode",
"binary_version": "3.20251202.1ubuntu2"
}
]
}
}
],
"modified": "2026-10-17T12:57:26.827658452Z",
"provider": "osv",
"upstream": [
"CVE-2025-29939"
],
"references": [
"https://ubuntu.com/security/CVE-2025-29939",
"https://www.cve.org/CVERecord?id=CVE-2025-29939",
"https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3023.html"
]
},
"related_cves": [
{
"value": "CVE-2025-29939",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 357494,
"published_at": "2026-02-10T20:16:00+00:00"
}