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Vulnerabilities CVE-2026-54411

CVE-2026-54411

Medium
Open
TLP:CLEAR

Linux-PAM pam_userdb Observable Timing Discrepancy in Plaintext Password Comparison

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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.

Details

CVSS Score
6.9
EPSS Score
0.33%

26th percentile

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/AU:N/V:D
Confidence
90%
Published
Jun 14, 2026
Last Modified
Aug 10, 2026
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