util-linux Hostname Canonicalization access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in util-linux. This issue affects some unknown processing of the component Hostname Canonicalization. The manipulation leads to access control. This vulnerability is listed as CVE-2026-3184. There is no available exploit.

Detailsinfo

A vulnerability was found in util-linux (the affected version is unknown). It has been rated as critical. This issue affects an unknown code of the component Hostname Canonicalization. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access.

The advisory is shared at bugzilla.redhat.com. The identification of this vulnerability is CVE-2026-3184. The exploitation is known to be easy. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/22/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 300049 (Linux Distros Unpatched Vulnerability : CVE-2026-3184), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (300049), EUVD (EUVD-2026-18817) and CERT Bund (WID-SEC-2026-0507). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • SUSE Linux
  • SUSE openSUSE
  • Microsoft Azure Linux
  • Open Source util-linux

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔒

CNA Base Score: 3.7
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 300049
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-3184

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/25/2026 Advisory disclosed
02/25/2026 +0 days VulDB entry created
07/22/2026 +147 days VulDB entry last update

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Not defined

CVE: CVE-2026-3184 (🔒)
GCVE (CVE): GCVE-0-2026-3184
GCVE (VulDB): GCVE-100-347813
EUVD: 🔒
CERT Bund: WID-SEC-2026-0507 - util-linux: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Entryinfo

Created: 02/25/2026 17:55
Updated: 07/22/2026 11:20
Changes: 02/25/2026 17:55 (48), 02/28/2026 05:40 (2), 04/03/2026 23:10 (1), 04/17/2026 11:17 (7), 05/06/2026 04:13 (21), 07/22/2026 11:20 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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