{"id":"CVE-2026-54411","summary":"Linux-PAM pam_userdb Observable Timing Discrepancy in Plaintext Password Comparison","details":"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.","modified":"2026-08-19T08:57:05.499072152Z","published":"2026-06-14T17:21:43.853Z","related":["ALSA-2026:56131","SUSE-SU-2026:22599-1","SUSE-SU-2026:22639-1","SUSE-SU-2026:22807-1","SUSE-SU-2026:22896-1","SUSE-SU-2026:3162-1","SUSE-SU-2026:3163-1","openSUSE-SU-2026:11201-1","openSUSE-SU-2026:21320-1"],"database_specific":{"cwe_ids":["CWE-208"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54411.json","cna_assigner":"TuranSec"},"references":[{"type":"WEB","url":"https://github.com/linux-pam/linux-pam/blob/master/libpam/include/pam_inline.h"},{"type":"WEB","url":"https://github.com/linux-pam/linux-pam/blob/master/modules/pam_userdb/pam_userdb.c#L327"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54411.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54411"},{"type":"PACKAGE","url":"https://github.com/linux-pam/linux-pam"},{"type":"ARTICLE","url":"https://cwe.mitre.org/data/definitions/208.html"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/linux-pam/linux-pam","events":[{"introduced":"0"},{"fixed":"fe03a10115c082a8486ccbab7462139d7e4bb067"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"1.7.2"},{"fixed":"1.7.2"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v1.7.1","v1.7.0","v1.6.1","v1.6.0","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.1","Linux-PAM-1.3.0","Linux-PAM-1_2_1","Linux-PAM-1_2_0","Linux-PAM-1_1_8","Linux-PAM-1_1_7","v1.1.6","Linux-PAM-1_1_5","v1.1.4","Linux-PAM-1_1_4","Linux-PAM-1_1-branch","Linux-PAM-1_1_3","Linux-PAM-1_1_2","Linux-PAM-1_1_1","Linux-PAM-1_1_0","Linux-PAM-1_0_92","Linux-PAM-1_0_91","Linux-PAM-1_0_90","Linux-PAM-1_0_0","Linux-PAM-0_99_10_0","pam_unix_refactor","Linux-PAM-0_99_9_0","Linux-PAM-0_99_8_1","Linux-PAM-0_99_8_0","Linux-PAM-0_99_7_1","Linux-PAM-0_99_7_0","Linux-PAM-0_99_6_3","Linux-PAM-0_99_6_2","Linux-PAM-0_99_6_1","Linux-PAM-0_99_6_0","Linux-PAM-0_99_5_0","Linux-PAM-0_99_4_0","Linux-PAM-0_99_3_0","Linux-PAM-0_99_2_1","Linux-PAM-0_99_2_0","Linux-PAM-0_99_1_0","help","before_automake","Linux-PAM-0-80","Linux-PAM-0-79","Linux-PAM-0-78","Linux-PAM-0-78-Beta1","Linux-PAM-0-77","Linux-PAM-0-76","Linux-PAM-0-75","Linux-PAM-0-74","Linux-PAM-0-73"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-54411.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}