MediumFix available
libnbd — security advisory
A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.
- Products
- libnbd
- Affected versions
- 1.14.2-1, 1.16.1-1, 1.16.2-1, 1.16.3-1, 1.16.4-1, 1.16.5-1, 1.18.0-1, 1.18.1-1, 1.18.2-1, 1.18.2-2, 1.20.0-1, 1.20.1-1, 1.20.2-1, 1.20.2-2, 1.20.3-1, 1.22.0-1, 1.22.2-1, 1.22.3-1, 1.22.5-1, 1.24.0-1, 1.24.0-2, 1.24.0-2.1, 1.24.1-1, 1.24.2-1, 1.24.2-2, 1.24.3-1, 1.24.4-1
- Fixed versions
- 1.16.5-1
- CVEs
- CVE-2023-5215
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 16:26 UTC · Revision 1
Source evidence
A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.
osv:DEBIAN-CVE-2023-5215
libnbd
Fixed versions: Not specified
libnbd
Fixed versions: 1.16.5-1
libnbd
Fixed versions: 1.16.5-1
Complete source record
{
"id": "ac08baff36214f550d2da7a217b49d9211830b73fe0ea562399c3380faacf64c",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-5215",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2023-5215",
"summary": "A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.",
"evidence": "osv:DEBIAN-CVE-2023-5215",
"products": [
{
"name": {
"value": "libnbd",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.14.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.18.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.18.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.18.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.18.2-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.2-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.22.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.22.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.22.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.22.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.0-2.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.2-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.4-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libnbd",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.16.5-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnbd",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.16.5-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2023-5215",
"aliases": [
"DEBIAN-CVE-2023-5215"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnbd",
"purl": "pkg:deb/debian/libnbd?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.14.2-1",
"1.16.1-1",
"1.16.2-1",
"1.16.3-1",
"1.16.4-1",
"1.16.5-1",
"1.18.0-1",
"1.18.1-1",
"1.18.2-1",
"1.18.2-2",
"1.20.0-1",
"1.20.1-1",
"1.20.2-1",
"1.20.2-2",
"1.20.3-1",
"1.22.0-1",
"1.22.2-1",
"1.22.3-1",
"1.22.5-1",
"1.24.0-1",
"1.24.0-2",
"1.24.0-2.1",
"1.24.1-1",
"1.24.2-1",
"1.24.2-2",
"1.24.3-1",
"1.24.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-5215.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.5-1"
}
]
}
],
"package": {
"name": "libnbd",
"purl": "pkg:deb/debian/libnbd?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-5215.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.5-1"
}
]
}
],
"package": {
"name": "libnbd",
"purl": "pkg:deb/debian/libnbd?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-5215.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T18:03:07.549418368Z",
"provider": "osv",
"upstream": [
"CVE-2023-5215"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2023-5215"
]
},
"related_cves": [
{
"value": "CVE-2023-5215",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 457743,
"published_at": "2023-09-28T14:15:26.117+00:00"
}