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CVE-2015-3246

Medium CVSS 5.1 Known exploited

Published 2015-08-11 · last changed 2026-08-27 · added to CISA KEV 2026-08-26

This one is being exploited in the wild.

CISA added CVE-2015-3246 to the Known Exploited Vulnerabilities catalog on 2026-08-26. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2015-3246, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, directly modifies /etc/passwd, which allows local users to cause a denial of service (inconsistent file state) by causing an error during the modification. NOTE: this issue can be combined with CVE-2015-3245 to gain privileges.

Sources

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H