CVE-2026-54411

Published: Jun 14, 2026Modified: Aug 10, 2026Deferred

6.9

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/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

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:XShow less

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (Secondary)

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.

Related CWEs

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.

References (4)

https://cwe.mitre.org/data/definitions/208.html

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

https://github.com/linux-pam/linux-pam

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

https://github.com/linux-pam/linux-pam/blob/master/libpam/include/pam_inline.h

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

https://github.com/linux-pam/linux-pam/blob/master/modules/pam_userdb/pam_userdb.c#L327

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

Timeline

No history available yet.