CVE-2026-54411
Linux-PAM pam_userdb Observable Timing Discrepancy in Plaintext Password Comparison
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:HConfidentialityHigh
I:NIntegrityNone
A:NAvailabilityNone
Weaknesses
Affected Products
Linux-PAM
oss-project
Exploitability
No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
References
https://cwe.mitre.org/data/definitions/208.html
cwe.mitre.org
https://github.com/linux-pam/linux-pam
github.com
https://github.com/linux-pam/linux-pam/blob/master/libpam/include/pam_inline.h
github.com
and 1 more references View all →
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