{"id":"CVE-2026-48792","state":"PUBLISHED","title":"pam_usb: pusb_has_virtual_input_device() silently discards EACCES, disabling remote desktop detection under non-root execution","description":"pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/evdev.c silently ignores EACCES errors when opening /dev/input/event* nodes, causing pusb_has_virtual_input_device() to return 0 (no virtual devices found) even when every open() call failed due to insufficient permissions. The caller in src/local.c cannot distinguish a clean absence of virtual devices from a permission-denied scan, and acts on the false negative by continuing authentication without denying. This vulnerability is fixed in 0.9.1.","publishedAt":"2026-05-27T19:55:46.392Z","updatedAt":"2026-05-28T13:27:37.016Z","severity":{"score":4.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["mcdope pam_usb"],"affected":[{"vendor":"mcdope","product":"pam_usb","versions":[{"version":"< 0.9.1","status":"affected"}]}],"references":["https://github.com/mcdope/pam_usb/security/advisories/GHSA-pvrg-chgw-x42c","https://github.com/mcdope/pam_usb/issues/351","https://github.com/mcdope/pam_usb/issues/55"],"weaknesses":["CWE-390","CWE-693"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/48xxx/CVE-2026-48792.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48792","state":"PUBLISHED","datePublished":"2026-05-27T19:55:46.392Z","dateUpdated":"2026-05-28T13:27:37.016Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-22T20:18:20.366Z"},"containers":{"cna":{"title":"pam_usb: pusb_has_virtual_input_device() silently discards EACCES, disabling remote desktop detection under non-root execution","descriptions":[{"lang":"en","value":"pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/evdev.c silently ignores EACCES errors when opening /dev/input/event* nodes, causing pusb_has_virtual_input_device() to return 0 (no virtual devices found) even when every open() call failed due to insufficient permissions. The caller in src/local.c cannot distinguish a clean absence of virtual devices from a permission-denied scan, and acts on the false negative by continuing authentication without denying. This vulnerability is fixed in 0.9.1."}],"affected":[{"vendor":"mcdope","product":"pam_usb","versions":[{"version":"< 0.9.1","status":"affected"}]}],"references":[{"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-pvrg-chgw-x42c","name":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-pvrg-chgw-x42c","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/mcdope/pam_usb/issues/351","name":"https://github.com/mcdope/pam_usb/issues/351","tags":["x_refsource_MISC"]},{"url":"https://github.com/mcdope/pam_usb/issues/55","name":"https://github.com/mcdope/pam_usb/issues/55","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-390","lang":"en","description":"CWE-390: Detection of Error Condition Without Action","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-693","lang":"en","description":"CWE-693: Protection Mechanism Failure","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-27T19:55:46.392Z"},"source":{"advisory":"GHSA-pvrg-chgw-x42c","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-28T13:27:27.036665Z","id":"CVE-2026-48792","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-28T13:27:37.016Z"}}]}}}