Vulnerability-Lookup

ESSA-2026:0163

Vulnerability from csaf_opensuse - Published: 2026-08-27 11:26 - Updated: 2026-09-17 12:33

Summary

Moderate: pam security update

Severity

Moderate

Notes

Title of the patch: Moderate: pam security update

Description of the patch: Pluggable Authentication Modules (PAM) provide a system to set up authentication policies without the need to recompile programs to handle authentication. Security Fix(es): linux-pam: Plaintext password recovery via timing discrepancy in pam_userdb module (CVE-2026-54411)

Patchnames: ESSA-2026:0163

CVE-2026-54411

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Recommended 5 products

Product	Version	Remediation
Unresolved product id: SUSE Liberty Linux 9:pam-0:1.5.1-28.el9_8.1.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:pam-0:1.5.1-28.el9_8.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:pam-devel-0:1.5.1-28.el9_8.1.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:pam-devel-0:1.5.1-28.el9_8.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:pam-docs-0:1.5.1-28.el9_8.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

7 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/e…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://www.suse.com/security/cve/CVE-2026-54411/	self
https://www.suse.com/security/cve/CVE-2026-54411	external
https://bugzilla.suse.com/1268290	external

JSON

To clipboard

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}

CVE-2026-54411 (GCVE-0-2026-54411)

Vulnerability from cvelistv5 – Published: 2026-06-14 17:21 – Updated: 2026-08-10 11:43

Title

Linux-PAM pam_userdb Observable Timing Discrepancy in Plaintext Password Comparison

Summary

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.

Severity

6.9 (Medium)


                        
                          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

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-15 16:59 UTC

CWE

CWE-208 - Observable Timing Discrepancy

Assigner

TuranSec redhat root Scorecard

References

4 references

URL	Tags
https://github.com/linux-pam/linux-pam	product
https://github.com/linux-pam/linux-pam/blob/maste…	product
https://github.com/linux-pam/linux-pam/blob/maste…	product
https://cwe.mitre.org/data/definitions/208.html	technical-description

Impacted products

1 product

Vendor	Product	Version
Linux-PAM	Linux-PAM	Affected: 0 , ≤ 1.7.2 (semver)

Date Public

2026-06-14 17:21

Credits

Xurshidbek Sobirjonov

Show details on NVD website

JSON

To clipboard

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      "references": [
        {
          "name": "Linux-PAM - upstream repository",
          "tags": [
            "product"
          ],
          "url": "https://github.com/linux-pam/linux-pam"
        },
        {
          "name": "Vulnerable plaintext-password comparison in pam_userdb.c (master)",
          "tags": [
            "product"
          ],
          "url": "https://github.com/linux-pam/linux-pam/blob/master/modules/pam_userdb/pam_userdb.c#L327"
        },
        {
          "name": "pam_consttime_streq helper available for the remediation",
          "tags": [
            "product"
          ],
          "url": "https://github.com/linux-pam/linux-pam/blob/master/libpam/include/pam_inline.h"
        },
        {
          "name": "CWE-208: Observable Timing Discrepancy",
          "tags": [
            "technical-description"
          ],
          "url": "https://cwe.mitre.org/data/definitions/208.html"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Linux-PAM pam_userdb Observable Timing Discrepancy in Plaintext Password Comparison",
      "x_assigner_notes": "The vulnerable comparison was verified by direct source inspection of modules/pam_userdb/pam_userdb.c at tag v1.7.2 and at master HEAD as of disclosure: lines 327-332 perform a length-equality early exit followed by strncmp() / strncasecmp(). Linux-PAM has previously addressed the same weakness class in a sibling module: NEWS for Release 1.7.0 records \"pam_unix: compare password hashes in constant time\", and Release 1.6.0 hardened pam_mkhomedir \"against timing attacks\". The pam_consttime_streq() helper used by those fixes lives in libpam/include/pam_inline.h, which pam_userdb.c already includes, so the remediation in pam_userdb is a drop-in replacement of the strncmp call. The v1.7.2 release notes do not list a pam_userdb hardening change. Exploitation is gated by (a) the administrator having configured pam_userdb with plaintext password storage (crypt=none, unknown crypt method, or no crypt= option), a discouraged but documented configuration; and (b) the calling service not applying an authentication-failure delay - both gates raise attack complexity and bound real-world impact, so CVSS is scored MEDIUM rather than HIGH consistent with prior CWE-208 timing-leak CVE scoring.",
      "x_author": "Xurshidbek Sobirjonov"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
    "assignerShortName": "TuranSec",
    "cveId": "CVE-2026-54411",
    "datePublished": "2026-06-14T17:21:43.853Z",
    "dateReserved": "2026-06-13T16:39:46.122Z",
    "dateUpdated": "2026-08-10T11:43:56.355Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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Action not permitted

ESSA-2026:0163

CVE-2026-54411 (GCVE-0-2026-54411)

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