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.
CVSS Details
- CVSS 4.0 Base Score: 6.9 (MEDIUM)
- CVSS 4.0 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 3.1 Base Score: 5.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | Upgrade pam-debuginfoUpgrade pam-libs-debuginfoUpgrade pam-develUpgrade pam-libsUpgrade pam-docsUpgrade pamNo solution existsUpgrade pam-debugsource | Jul 17, 2026 | Jun 14, 2026 |
| Rocky_linux | — | Upgrade pam-develUpgrade pam-debuginfoUpgrade pamUpgrade pam-libs-debuginfoUpgrade pam-docsUpgrade pam-debugsourceUpgrade pam-libs | Aug 20, 2026 | Aug 19, 2026 |
| Ubuntu | — | Upgrade libpam-modules | Jul 26, 2026 | Jul 23, 2026 |
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