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VulnerabilityPublished

CVE-2026-44710: mcdope pam_usb · NULL Pointer Dereference

Affects mcdope pam_usbSource CVE Database V5

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Not known to be exploited · CVSS 4.6 Medium : upgrade to 0.8.7 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
4.6Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.8.7
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade pam_usb and mcdope/pam_usb to 0.8.7.

Affected software

ProductAffectedFixed in
mcdopepam_usbAffected
  • <0.8.7
Fixed in
  • 0.8.7
GitHubmcdope/pam_usbpkg:github/mcdope/pam_usbOther threatsAffected
  • <0.8.7
Fixed in
  • 0.8.7

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade pam_usb to version 0.8.7 or later, where the NULL pointer dereference issue is fixed. No other mitigation is indicated or required.

Description

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/device.c passed the return values of udisks_drive_get_serial(), udisks_drive_get_vendor(), and udisks_drive_get_model() directly to strcmp() without NULL checks. The GIO/UDisks API documentation states these accessors can return NULL for devices that do not expose the corresponding field. Passing NULL to strcmp() is undefined behaviour (typically a SIGSEGV). This vulnerability is fixed in 0.8.7.

References

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