🛡️ CVE-2026-48983

🟡 CVSS 5.8 — Medium ✅ No Known Exploit CWE-367 NVD
5.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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 written to an attacker-controlled location, potentially exposing future pad values before use or disrupting authentication. This issue has been fixed in version 0.9.2.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity low, availability low.

Weakness class

CVE-2026-48983 is classified as CWE-367: Time-of-check Time-of-use Race Condition. The state checked and the state acted upon can differ, because it may change between the two steps.

Affected software

CVE-2026-48983 is recorded against 1 package.

  • unknown

Timeline and source

Published on 18 June 2026 and last revised on 22 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com

Details

Severity MEDIUM
CVSS Score 5.8
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
CWE CWE-367
Public Exploit ✅ No
Source NVD
Published 2026-06-18
Updated 2026-08-11
Modified 2026-06-22
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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