CVE Explorer

CVE-2026-48983

pam_usb provides hardware authentication for Linux using ordinary removable media. In versions prior to 0.9.2, a symlink race condition exists in per-device and per-user pad directory creation. pam_usb uses a check-then-act pattern: it calls lstat() to test for existence and then calls mkdir() separately to create the directory. A local attacker can win the race between these calls by replacing the target path with a symlink to a directory they control. If successful, one-time pad files may be w

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1f8223b902c9e73732550adf19d0aca829b58c6e15447469fff41498a8f39780

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"pam_usb","vendor":"mcdope","versions":[{"status":"affected","version":"< 0.9.2"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:d03c3b81cdc71ae9308b7a50182c334c6c597b17045349a7b25141cfbde2a071 · sha256:6cb9ed89b7a38b9b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:d03c3b81cdc71ae9308b7a50182c334c6c597b17045349a7b25141cfbde2a071 · sha256:6cb9ed89b7a38b9b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:d03c3b81cdc71ae9308b7a50182c334c6c597b17045349a7b25141cfbde2a071 · sha256:6cb9ed89b7a38b9b… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/mcdope/pam_usb/releases/tag/0.9.2","tags":["x_refsource_MISC"],"url":"https://github.com/mcdope/pam_usb/releases/tag/0.9.2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:d03c3b81cdc71ae9308b7a50182c334c6c597b17045349a7b25141cfbde2a071 · sha256:6cb9ed89b7a38b9b… · /containers/cna/references/1

{"name":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-4j8q-67fq-3xc3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-4j8q-67fq-3xc3"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:d03c3b81cdc71ae9308b7a50182c334c6c597b17045349a7b25141cfbde2a071 · sha256:6cb9ed89b7a38b9b… · /containers/cna/references/0

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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