---
title: "Security digest: July 23, 2015"
url: https://erroneo.us/security/2015-07-23/
description: "July 23, 2015 vulnerability digest: 1 brief (libuser CVE-2015-3246: 2015 Linux Root Bug Lands…). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2015-07-23
date_modified: 2026-08-26
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: July 23, 2015

1 editorial brief.

## Take stock

- Most can relax: libuser CVE-2015-3246: 2015 Linux Root Bug Lands in KEV . Owners of RHEL or CentOS 5, 6 or 7 systems, old VM images, appliances or containers whose libuser package predates the July 2015 fix, most urgently internet-facing web servers where an attacker could land a shell.
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Editorial briefs

- **Most can relax** [libuser CVE-2015-3246: 2015 Linux Root Bug Lands in KEV](https://erroneo.us/security/briefs/libuser-userhelper-passwd-race-cve-2015-3246/index.md): Any RHEL or CentOS 6 or 7 host that has taken updates since July 2015 is already fixed; the real risk is forgotten legacy Linux servers, where this is one of several old root exploits attackers now chain after a web compromise.

## Known exploited (CISA KEV)

None.

## Critical advisories

None.

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Source page: https://erroneo.us/security/2015-07-23/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt