CVE-2026-54411 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. DescriptionLinux-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. Metrics
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CVSS 4.0 Severity and Vector Strings:
CNA: TuranSec
CVSS-BT 6.9 MEDIUM
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
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Quick InfoCVE Dictionary Entry:CVE-2026-54411 NVD Published Date: 06/14/2026 NVD Last Modified: 06/14/2026 Source: TuranSec |
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