High
xscreensaver — security advisory
The Debian xscreensaver 5.42+dfsg1-1 package for XScreenSaver has cap_net_raw enabled for the /usr/libexec/xscreensaver/sonar file, which allows local users to gain privileges because this is arguably incompatible with the design of the Mesa 3D Graphics library dependency.
- Products
- xscreensaver
- Affected versions
- 5.30-1ubuntu1, 5.34-1ubuntu1, 5.34-2ubuntu1, 5.36-1ubuntu1, 5.42+dfsg1-1ubuntu1, 5.45+dfsg1-2ubuntu1, 6.02+dfsg1-2ubuntu2, 6.06+dfsg1-3ubuntu1, 6.08+dfsg1-1ubuntu1, 6.08+dfsg1-1ubuntu2, 6.08+dfsg1-1ubuntu3, 6.08+dfsg1-1ubuntu4, 6.08+dfsg1-1ubuntu5
- Fixed versions
- Not specified
- CVEs
- CVE-2021-31523
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:58 UTC · Revision 1
Source evidence
The Debian xscreensaver 5.42+dfsg1-1 package for XScreenSaver has cap_net_raw enabled for the /usr/libexec/xscreensaver/sonar file, which allows local users to gain privileges because this is arguably incompatible with the design of the Mesa 3D Graphics library dependency.
osv:UBUNTU-CVE-2021-31523
xscreensaver
Fixed versions: Not specified
xscreensaver
Fixed versions: Not specified
xscreensaver
Fixed versions: Not specified
xscreensaver
Fixed versions: Not specified
xscreensaver
Fixed versions: Not specified
xscreensaver
Fixed versions: Not specified
xscreensaver
Fixed versions: Not specified
xscreensaver
Fixed versions: Not specified
Complete source record
{
"id": "b68cc19f1de00032de21e951fe9e4d1da4e105b253e8629a7108c3148bd371d8",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-31523",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-31523",
"summary": "The Debian xscreensaver 5.42+dfsg1-1 package for XScreenSaver has cap_net_raw enabled for the /usr/libexec/xscreensaver/sonar file, which allows local users to gain privileges because this is arguably incompatible with the design of the Mesa 3D Graphics library dependency.",
"evidence": "osv:UBUNTU-CVE-2021-31523",
"products": [
{
"name": {
"value": "xscreensaver",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.30-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "5.34-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "5.34-2ubuntu1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "xscreensaver",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.36-1ubuntu1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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}
]
},
{
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "5.45+dfsg1-2ubuntu1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "xscreensaver",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.02+dfsg1-2ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "6.06+dfsg1-3ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "6.08+dfsg1-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "6.08+dfsg1-1ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "6.08+dfsg1-1ubuntu3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "xscreensaver",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.08+dfsg1-1ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "6.08+dfsg1-1ubuntu4",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "xscreensaver",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.08+dfsg1-1ubuntu5",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "xscreensaver",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.08+dfsg1-1ubuntu4",
"evidence": "/affected/7/versions"
},
{
"value": "6.08+dfsg1-1ubuntu5",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2021-31523",
"aliases": [
"UBUNTU-CVE-2021-31523"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/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": "xscreensaver",
"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"5.30-1ubuntu1",
"5.34-1ubuntu1",
"5.34-2ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
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{
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"binary_version": "5.34-2ubuntu1"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "5.34-2ubuntu1"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "5.34-2ubuntu1"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "5.34-2ubuntu1"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "5.34-2ubuntu1"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "5.34-2ubuntu1"
},
{
"binary_name": "xscreensaver-screensaver-webcollage",
"binary_version": "5.34-2ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xscreensaver",
"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"5.36-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xscreensaver",
"binary_version": "5.36-1ubuntu1"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "5.36-1ubuntu1"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "5.36-1ubuntu1"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "5.36-1ubuntu1"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "5.36-1ubuntu1"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "5.36-1ubuntu1"
},
{
"binary_name": "xscreensaver-screensaver-webcollage",
"binary_version": "5.36-1ubuntu1"
}
]
}
},
{
"ranges": [
{
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"events": [
{
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],
"package": {
"name": "xscreensaver",
"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"5.42+dfsg1-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xscreensaver",
"binary_version": "5.42+dfsg1-1ubuntu1"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "5.42+dfsg1-1ubuntu1"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "5.42+dfsg1-1ubuntu1"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "5.42+dfsg1-1ubuntu1"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "5.42+dfsg1-1ubuntu1"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "5.42+dfsg1-1ubuntu1"
},
{
"binary_name": "xscreensaver-screensaver-webcollage",
"binary_version": "5.42+dfsg1-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xscreensaver",
"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"5.45+dfsg1-2ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xscreensaver",
"binary_version": "5.45+dfsg1-2ubuntu1"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "5.45+dfsg1-2ubuntu1"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "5.45+dfsg1-2ubuntu1"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "5.45+dfsg1-2ubuntu1"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "5.45+dfsg1-2ubuntu1"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "5.45+dfsg1-2ubuntu1"
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}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"6.02+dfsg1-2ubuntu2",
"6.06+dfsg1-3ubuntu1",
"6.08+dfsg1-1ubuntu1",
"6.08+dfsg1-1ubuntu2",
"6.08+dfsg1-1ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xscreensaver",
"binary_version": "6.08+dfsg1-1ubuntu3"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "6.08+dfsg1-1ubuntu3"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "6.08+dfsg1-1ubuntu3"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "6.08+dfsg1-1ubuntu3"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "6.08+dfsg1-1ubuntu3"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "6.08+dfsg1-1ubuntu3"
},
{
"binary_name": "xscreensaver-screensaver-webcollage",
"binary_version": "6.08+dfsg1-1ubuntu3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xscreensaver",
"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"6.08+dfsg1-1ubuntu3",
"6.08+dfsg1-1ubuntu4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xscreensaver",
"binary_version": "6.08+dfsg1-1ubuntu4"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "6.08+dfsg1-1ubuntu4"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "6.08+dfsg1-1ubuntu4"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "6.08+dfsg1-1ubuntu4"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "6.08+dfsg1-1ubuntu4"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "6.08+dfsg1-1ubuntu4"
},
{
"binary_name": "xscreensaver-screensaver-webcollage",
"binary_version": "6.08+dfsg1-1ubuntu4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xscreensaver",
"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"6.08+dfsg1-1ubuntu5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xscreensaver",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-screensaver-webcollage",
"binary_version": "6.08+dfsg1-1ubuntu5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
"name": "xscreensaver",
"purl": "pkg:deb/ubuntu/xscreensaver?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"6.08+dfsg1-1ubuntu4",
"6.08+dfsg1-1ubuntu5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xscreensaver",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-data",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-data-extra",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-gl",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-gl-extra",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-screensaver-bsod",
"binary_version": "6.08+dfsg1-1ubuntu5"
},
{
"binary_name": "xscreensaver-screensaver-webcollage",
"binary_version": "6.08+dfsg1-1ubuntu5"
}
]
}
}
],
"modified": "2026-10-17T12:56:19.632721636Z",
"provider": "osv",
"upstream": [
"CVE-2021-31523"
],
"references": [
"https://ubuntu.com/security/CVE-2021-31523",
"https://www.openwall.com/lists/oss-security/2021/04/17/1",
"https://bugs.chromium.org/p/project-zero/issues/detail?id=2174",
"https://www.cve.org/CVERecord?id=CVE-2021-31523"
]
},
"related_cves": [
{
"value": "CVE-2021-31523",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355271,
"published_at": "2021-04-21T19:15:00+00:00"
}