6.9

CVE-2026-54411

Linux-PAM pam_userdb Observable Timing Discrepancy in Plaintext Password Comparison

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux-PAM
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Produkt Linux-PAM
Default Statusunknown
Version <= 1.7.2
Version 0
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.33% 0.255
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c 6.9 0 0
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
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c 5.9 2.2 3.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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.

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