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CVE-2026-54411

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. The comparison uses strncmp() (or strncasecmp() when PAM_ICASE_ARG is set) preceded by a length-equality check, so t
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4d9aa5ad672b20cd3104b15173ebe7f59356af873e67f538f05647fa13890fc1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NO","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentiali…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"collectionURL":"https://github.com/linux-pam/linux-pam","defaultStatus":"unknown","modules":["pam_userdb"],"product":"Linux-PAM","programFiles":["modules/pam_userdb/pam_userdb.c"],"repo":"https://github.com/linux-pam/linux-pam","vendor":"Linux-PAM","versions":[{"lessThanOrEqual":"1.7.2","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NO","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentiali…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-208","description":"CWE-208 Observable Timing Discrepancy","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"CWE-208: Observable Timing Discrepancy","tags":["technical-description"],"url":"https://cwe.mitre.org/data/definitions/208.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/references/3
{"name":"Linux-PAM - upstream repository","tags":["product"],"url":"https://github.com/linux-pam/linux-pam"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/references/0
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/references/2
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b2314e45426adbf75948e7147e492e6815a544b455ed45ce3217015cb7737b6a · sha256:82ed852bdc8785ee… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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