High
Security advisory
A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-44731
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:49 UTC · Revision 1
Source evidence
A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
osv:CVE-2021-44731
Complete source record
{
"id": "ccaf4b9abc30229519ab320d7f79b00c62920083bd69a1104bbd0f225b036101",
"url": "https://osv.dev/vulnerability/CVE-2021-44731",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-44731",
"summary": "A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1",
"evidence": "osv:CVE-2021-44731",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-44731",
"aliases": [
"CVE-2021-44731"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/canonical/snapd",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "f6ff602cae4755eb38d1bbb20fa15752cb3b763a"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:canonical:snapd:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "2.54.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"2.54.2",
"2.54.1",
"2.54",
"untagged-ec50ee5bfb45daefc236",
"2.15.2",
"2.15",
"2.14.2.16.04",
"2.14.1",
"2.14",
"2.13",
"2.12",
"2.11",
"2.0.10",
"2.0.9",
"2.0.8",
"2.0.7",
"2.0.6",
"2.0.5",
"2.0.4",
"2.0.3",
"2.0",
"1.9.4",
"1.9.3",
"1.9.2",
"1.9.1",
"1.9",
"ppa",
"1.7.3+20160310ubuntu1",
"1.7.3+20160308ubuntu1",
"1.7.3+20160303ubuntu4",
"1.7.3+20160303ubuntu3",
"1.7.3+20160303ubuntu2",
"1.7.3+20160303ubuntu1",
"1.7.3+20160225ubuntu1",
"1.7.2+20160223ubuntu1",
"1.7.2+20160204ubuntu1",
"1.7.2+20160113ubuntu1",
"1.7.2ubuntu1",
"1.7ubuntu1",
"1.6ubuntu1",
"1.5ubuntu1",
"1.4ubuntu1",
"1.3ubuntu1",
"1.2-0ubuntu1",
"1.1.2-0ubuntu1",
"1.1.1-0ubuntu1",
"1.1-0ubuntu1",
"1.0.1-0ubuntu1",
"1.0-0ubuntu1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44731.json"
}
}
],
"modified": "2026-10-24T10:30:22.426956459Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/",
"https://www.debian.org/security/2022/dsa-5080",
"https://ubuntu.com/security/notices/USN-5292-1"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "20.04"
},
{
"last_affected": "20.04"
},
{
"introduced": "21.10"
},
{
"last_affected": "21.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
},
{
"introduced": "11.0"
},
{
"last_affected": "11.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "34"
},
{
"last_affected": "34"
},
{
"introduced": "35"
},
{
"last_affected": "35"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-44731",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430677,
"published_at": "2022-02-17T23:15:07.473+00:00"
}