{"id":80544,"date":"2026-06-14T20:51:43","date_gmt":"2026-06-14T17:21:43","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-54411-linux-pam-pam_userdb-plaintext-password-recovery-timing-vulnerability\/"},"modified":"2026-06-14T20:51:43","modified_gmt":"2026-06-14T17:21:43","slug":"cve-2026-54411-linux-pam-pam_userdb-plaintext-password-recovery-timing-vulnerability","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-54411-linux-pam-pam_userdb-plaintext-password-recovery-timing-vulnerability\/","title":{"rendered":"CVE-2026-54411 &#8211; Linux-PAM pam_userdb Plaintext Password Recovery Timing Vulnerability"},"content":{"rendered":"<p>CVE ID :CVE-2026-54411<\/p>\n<p>  Published : June 14, 2026, 5:21 p.m. | 35\u00a0minutes ago<\/p>\n<p>  Description :Linux-PAM through 1.7.2 contains an observable timing discrepancy (CWE-208) in the pam_userdb module&#8217;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&#8217;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.<\/p>\n<p>  Severity: 6.9 | MEDIUM<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-54411 Published : June 14, 2026, 5:21 p.m. | 35\u00a0minutes ago Description :Linux-PAM through 1.7.2 contains an observable timing discrepancy (CWE-208) in the pam_userdb module&#8217;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 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-80544","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80544","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=80544"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80544\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=80544"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=80544"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=80544"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}