CVE-2026-3184: Authentication Bypass by Alternate Name in Red Hat Red Hat Enterprise Linux 10
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.
AI Analysis
Technical Summary
A flaw in util-linux's login(1) utility on Red Hat Enterprise Linux 10 causes improper hostname canonicalization when invoked with the -h option. This can alter the remote hostname before it is set in PAM_RHOST, enabling a remote attacker to bypass host-based PAM access control rules that depend on fully qualified domain names. The vulnerability has a CVSS 3.7 (low) rating and does not currently have an official fix or remediation guidance published by Red Hat. No exploits are known in the wild.
Potential Impact
The vulnerability may allow a remote attacker to bypass host-based PAM access control mechanisms that rely on fully qualified domain names, potentially leading to unauthorized access with limited impact. There is no impact on confidentiality or availability. No known exploits have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-3184 for current remediation guidance. Until a fix is available, review PAM configurations and consider restricting or monitoring login attempts that use the -h option. Do not assume the vulnerability is mitigated without vendor confirmation.
CVE-2026-3184: Authentication Bypass by Alternate Name in Red Hat Red Hat Enterprise Linux 10
Description
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
A flaw in util-linux's login(1) utility on Red Hat Enterprise Linux 10 causes improper hostname canonicalization when invoked with the -h option. This can alter the remote hostname before it is set in PAM_RHOST, enabling a remote attacker to bypass host-based PAM access control rules that depend on fully qualified domain names. The vulnerability has a CVSS 3.7 (low) rating and does not currently have an official fix or remediation guidance published by Red Hat. No exploits are known in the wild.
Potential Impact
The vulnerability may allow a remote attacker to bypass host-based PAM access control mechanisms that rely on fully qualified domain names, potentially leading to unauthorized access with limited impact. There is no impact on confidentiality or availability. No known exploits have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-3184 for current remediation guidance. Until a fix is available, review PAM configurations and consider restricting or monitoring login attempts that use the -h option. Do not assume the vulnerability is mitigated without vendor confirmation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-02-25T08:02:20.937Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-3184","vendor":"Red Hat"}]
Threat ID: 69d011d20a160ebd9251326c
Added to database: 4/3/2026, 7:15:30 PM
Last enriched: 4/3/2026, 7:30:28 PM
Last updated: 4/3/2026, 8:20:48 PM
Views: 4
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