Medium
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
- 1.0.3-1, 1.10.2-1, 1.10.5-1, 1.16.4-1, 1.18.1-1, 1.18.2-1, 1.18.2-1build1, 1.18.2-2, 1.18.2-2build1, 1.2.1-2, 1.2.2-1ubuntu2, 1.20.0-1, 1.22.0-1, 1.22.2-1build1, 1.22.2-1build2, 1.24.0-2ubuntu1, 1.24.1-1ubuntu6, 1.24.2-1ubuntu1, 1.24.2-2ubuntu1, 1.24.3-1ubuntu1, 1.6.3-1, 1.8.5-1
- Fixed versions
- Not specified
- CVEs
- CVE-2023-5215
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:44 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:UBUNTU-CVE-2023-5215
libnbd
Fixed versions: Not specified
libnbd
Fixed versions: Not specified
libnbd
Fixed versions: Not specified
libnbd
Fixed versions: Not specified
libnbd
Fixed versions: Not specified
libnbd
Fixed versions: Not specified
Complete source record
{
"id": "c48dc479b929b0ce03a2c0eae5fc7047d99f41b06b2234a6ce33fdb41e2ed5b8",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2023-5215",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-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:UBUNTU-CVE-2023-5215",
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{
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{
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{
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{
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{
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],
"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
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"affected": [
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"database_specific": {
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},
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},
{
"binary_name": "libnbd0",
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},
{
"binary_name": "nbdfuse",
"binary_version": "1.2.2-1ubuntu2"
},
{
"binary_name": "python3-libnbd",
"binary_version": "1.2.2-1ubuntu2"
}
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}
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libnbd?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
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],
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},
"ecosystem_specific": {
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"binary_version": "1.10.5-1"
},
{
"binary_name": "libnbd-ocaml",
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},
{
"binary_name": "libnbd0",
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},
{
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.16.4-1",
"1.18.1-1",
"1.18.2-1",
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],
"modified": "2026-10-17T12:57:21.955724983Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2023-5215",
"https://access.redhat.com/security/cve/CVE-2023-5215",
"https://listman.redhat.com/archives/libguestfs/2023-September/032635.html",
"https://www.cve.org/CVERecord?id=CVE-2023-5215"
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},
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"source_id": "core-osv",
"document_id": 357336,
"published_at": "2023-09-28T14:15:00+00:00"
}