---
cve: "CVE-2026-54411"
severity: "MEDIUM"
cvss: 6.9
epss: "33%"
vendor: "Linux-PAM"
kev: false
exploited: false
published: "2026-06-14 18:17:20"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T13:37:18+02:00"
---

# CVE-2026-54411

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

Linux-PAM through 1.7.2 contains an observable timing discrepancy (CWE-208) in the pam_userdb module's plaintext-password comparison path in modules/pam_userdb/pam_userdb.c that allows a local or network-adjacent attacker able to repeatedly drive authentication through a calling service to recover the plaintext password of a target account by measuring response-timing differences.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-208** — Observable Timing Discrepancy
  Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.

## Angriffsmuster (CAPEC)

- [CAPEC-462 — Cross-Domain Search Timing](https://capec.mitre.org/data/definitions/462.html) _(Severity: Medium)_
- [CAPEC-541 — Application Fingerprinting](https://capec.mitre.org/data/definitions/541.html) _(Severity: Low)_
- [CAPEC-580 — System Footprinting](https://capec.mitre.org/data/definitions/580.html) _(Severity: Low)_

## ATT&CK-Techniken

- [T1592.002 — Gather Victim Host Information: Software](https://attack.mitre.org/techniques/T1592/002/)
- [T1082 — System Information Discovery](https://attack.mitre.org/techniques/T1082/)

## Patch verfügbar (OSV)

- fe03a10115c082a8486ccbab7462139d7e4bb067 (Commit)

## Referenzen

- <https://github.com/linux-pam/linux-pam>
- <https://github.com/linux-pam/linux-pam/blob/master/modules/pam_userdb/pam_userdb.c#L327>
- <https://github.com/linux-pam/linux-pam/blob/master/libpam/include/pam_inline.h>
- <https://cwe.mitre.org/data/definitions/208.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54411) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_