CVE Explorer

CVE-2026-48985

pam_usb provides hardware authentication for Linux using ordinary removable media. In versions 0.9.1 and below, pusb_is_loginctl_local() can cause a NULL dereference crash when parsing loginctl output. The function calls popen() and reads the result; if the Remote field is only a newline, fgets() succeeds but strtok_r(buf, "\n", &saveptr) returns NULL. A subsequent strcmp(is_remote, "no") then dereferences NULL, causing undefined behavior (typically SIGSEGV) and crashing the PAM module. This can

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:810410bff218e9440f0675a214aa0dafe1b0fcc5b237455c9dca1042a8c860c9

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:v2:0f4f0d8b6a59783a1502b32f405f892c4a060964e7ad38c9c9248ed342d2e887 · sha256:5036fba34d24741c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:0f4f0d8b6a59783a1502b32f405f892c4a060964e7ad38c9c9248ed342d2e887 · sha256:5036fba34d24741c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:0f4f0d8b6a59783a1502b32f405f892c4a060964e7ad38c9c9248ed342d2e887 · sha256:5036fba34d24741c… · /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:v2:0f4f0d8b6a59783a1502b32f405f892c4a060964e7ad38c9c9248ed342d2e887 · sha256:5036fba34d24741c… · /containers/cna/references/1

{"name":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-7j6h-wfc2-mg5q","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-7j6h-wfc2-mg5q"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:0f4f0d8b6a59783a1502b32f405f892c4a060964e7ad38c9c9248ed342d2e887 · sha256:5036fba34d24741c… · /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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