usn-8601-1
Vulnerability from osv_ubuntu
Published
2026-07-23 14:49
Modified
2026-07-23 14:49
Summary
pam vulnerability
Details
It was discovered that PAM had a timing discrepancy in the pam_userdb module when comparing plaintext passwords. An attacker could possibly use this issue to obtain sensitive information by measuring response-timing differences during repeated authentication attempts.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-54411",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:N/V:D",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libpam-cracklib",
"binary_version": "1.4.0-11ubuntu2.7"
},
{
"binary_name": "libpam-modules",
"binary_version": "1.4.0-11ubuntu2.7"
},
{
"binary_name": "libpam-modules-bin",
"binary_version": "1.4.0-11ubuntu2.7"
},
{
"binary_name": "libpam-runtime",
"binary_version": "1.4.0-11ubuntu2.7"
},
{
"binary_name": "libpam0g",
"binary_version": "1.4.0-11ubuntu2.7"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "pam",
"purl": "pkg:deb/ubuntu/pam@1.4.0-11ubuntu2.7?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.4.0-11ubuntu2.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.1-5ubuntu11",
"1.4.0-10ubuntu1",
"1.4.0-10ubuntu2",
"1.4.0-11ubuntu1",
"1.4.0-11ubuntu2",
"1.4.0-11ubuntu2.1",
"1.4.0-11ubuntu2.3",
"1.4.0-11ubuntu2.4",
"1.4.0-11ubuntu2.5",
"1.4.0-11ubuntu2.6"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-54411",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:N/V:D",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libpam-modules",
"binary_version": "1.5.3-5ubuntu5.6"
},
{
"binary_name": "libpam-modules-bin",
"binary_version": "1.5.3-5ubuntu5.6"
},
{
"binary_name": "libpam-runtime",
"binary_version": "1.5.3-5ubuntu5.6"
},
{
"binary_name": "libpam0g",
"binary_version": "1.5.3-5ubuntu5.6"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "pam",
"purl": "pkg:deb/ubuntu/pam@1.5.3-5ubuntu5.6?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.3-5ubuntu5.6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.5.2-6ubuntu1",
"1.5.2-9.1ubuntu1",
"1.5.2-9.1ubuntu2",
"1.5.2-9.1ubuntu3",
"1.5.3-5ubuntu3",
"1.5.3-5ubuntu4",
"1.5.3-5ubuntu5",
"1.5.3-5ubuntu5.1",
"1.5.3-5ubuntu5.4",
"1.5.3-5ubuntu5.5"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-54411",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:N/V:D",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libpam-modules",
"binary_version": "1.7.0-5ubuntu3.1"
},
{
"binary_name": "libpam-modules-bin",
"binary_version": "1.7.0-5ubuntu3.1"
},
{
"binary_name": "libpam-runtime",
"binary_version": "1.7.0-5ubuntu3.1"
},
{
"binary_name": "libpam0g",
"binary_version": "1.7.0-5ubuntu3.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "pam",
"purl": "pkg:deb/ubuntu/pam@1.7.0-5ubuntu3.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.0-5ubuntu3.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.7.0-5ubuntu2",
"1.7.0-5ubuntu3"
]
}
],
"aliases": [],
"details": "It was discovered that PAM had a timing discrepancy in the pam_userdb\nmodule when comparing plaintext passwords. An attacker could possibly use\nthis issue to obtain sensitive information by measuring response-timing\ndifferences during repeated authentication attempts.",
"id": "USN-8601-1",
"modified": "2026-07-23T14:49:52Z",
"published": "2026-07-23T14:49:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8601-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-54411"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "pam vulnerability",
"upstream": [
"UBUNTU-CVE-2026-54411"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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