> CVE-2026-54411 [MEDIUM]

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PUBLISHED
2026-06-14 18:17
MODIFIED
2026-06-14 18:17
CVSS_SCORE V3
6.9
EPSS (Prob. Exploit)
0.50%
Top 58.0%
DATA SOURCES:
NVD 🔗 2026-06-14 RED HAT 🔗 2026-06-21 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 MSRC 🔗 2026-11-02

> DESCRIPTION

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. The comparison uses strncmp() (or strncasecmp() when PAM_ICASE_ARG is set) preceded by a length-equality check, so the time to reject a candidate depends on the index of the first differing byte and on whether the candidate's length matches the stored password, leaking the password length and individual prefix bytes. The vulnerable path is reached when the administrator configures pam_userdb with crypt=none, with an unrecognized crypt method, or without a crypt= argument, causing the module to store and compare credentials in plaintext.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:X/V:D/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:X/V:D/RE:X/U:X
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-208

> CWE DETAILED DESCRIPTIONS

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.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS)...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS)...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerab...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerab...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security has...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On. Red Hat Product...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. Red Hat Product...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerabi...
Red Hat Security Advisory: pam security update
An update for pam is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of moderate. A Common Vulnerability Scoring System (CVSS)...
Red Hat Security Advisory: Red Hat AI Base Images 3.0.3 (cuda)
Red Hat AI Base Images 3.0.3 (cuda) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.3 (spyre)
Red Hat AI Base Images 3.0.3 (spyre) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.3 (cpu)
Red Hat AI Base Images 3.0.3 (cpu) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.3 (tpu)
Red Hat AI Base Images 3.0.3 (tpu) is now available.
Red Hat Security Advisory: Red Hat AI Inference Server 3.2.2 (rocm)
Red Hat AI Inference Server 3.2.2 (rocm) is now available.
Red Hat Security Advisory: Red Hat AI Inference Server 3.2.2 (cuda)
Red Hat AI Inference Server 3.2.2 (cuda) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.3 (rocm)
Red Hat AI Base Images 3.0.3 (rocm) is now available.
Red Hat Security Advisory: Red Hat AI Inference Server Model Optimization Tools 3.2.2 (CUDA)
Red Hat AI Inference Server Model Optimization Tools 3.2.2 (CUDA) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.3 (ROCm 7.0)
Red Hat AI Base Images 3.2.3 (ROCm 7.0) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.3 (CUDA 12.9)
Red Hat AI Base Images 3.2.3 (CUDA 12.9) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.3 (Spyre)
Red Hat AI Base Images 3.2.3 (Spyre) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.3 (CPU)
Red Hat AI Base Images 3.2.3 (CPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.3 (ROCm 6.4)
Red Hat AI Base Images 3.2.3 (ROCm 6.4) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.3 (TPU)
Red Hat AI Base Images 3.2.3 (TPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.3 (Neuron)
Red Hat AI Base Images 3.4.3 (Neuron) is now available.
Red Hat Security Advisory: Red Hat AI Inference Model Optimization Tools 3.5.2 (CUDA)
Red Hat AI Inference Model Optimization Tools 3.5.2 (CUDA) is now available.
Red Hat Security Advisory: Red Hat AI Inference Tech Preview 3.5.2 (Gaudi)
Red Hat AI Inference Tech Preview 3.5.2 (Gaudi) is now available.
Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (ROCm)
Red Hat AI Inference 3.5.2 (ROCm) is now available.
Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (cpu)
Red Hat AI Inference 3.5.2 (cpu) is now available.
Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (spyre)
Red Hat AI Inference 3.5.2 (spyre) is now available.
Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (cuda)
Red Hat AI Inference 3.5.2 (cuda) is now available.
Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.5.2 enhancement update
Updated Red Hat Enterprise Linux AI 3.5.2 container images are now available.
Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.5.2 enhancement update
Updated Red Hat Enterprise Linux AI 3.5.2 container disk images are now available.

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Moderate

> HISTORIQUE DES MODIFICATIONS

Première apparition
14/06/2026 18:17
Source: NVD
📊 ENRICHISSEMENT 01/07/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
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 infor...
📊 ENRICHISSEMENT 21/06/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 21/06/2026 05:02
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 3 Dernière mise à jour: 4 months ago

> REFERENCES

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