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NVD / CVE Program· CNA redhat

CVE-2026-3184: Util-linux: util-linux: access control bypass due to improper hostname canonicalization

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.43% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 util-linux 2.40.2-3 on Azure Linux 3.0 2.40.2-4; azl3 util-linux 2.40.2-4 on Azure Linux 3.0 2.40.2-4; cbl2 util-linux 2.37.4-10 on CBL Mariner 2.0 2.37.4-11.

Low priority for now. Upgrade to azl3 util-linux 2.40.2-3 on Azure Linux 3.0 2.40.2-4; azl3 util-linux 2.40.2-4 on Azure Linux 3.0 2.40.2-4; cbl2 util-linux 2.37.4-10 on CBL Mariner 2.0 2.37.4-11 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Apr 3, 2026
Updated
Aug 31, 2026
EPSS
0.4% · 37th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.3
CNA · redhat
3.7
1.6 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-3184

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
kernelutil-linux
redhathardened images

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • kernel util-linuxall versions
  • redhat hardened imagesall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsunknown

  • Red Hat Red Hat Hardened Images

    • 2.42-7.1.hum1 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsunknown
    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12util-linuxfrom 0—
Debian:14util-linuxbefore 2.42-12.42-1
openSUSE:Leap 15.6python-libmountbefore 2.39.3-150600.4.18.12.39.3-150600.4.18.1
openSUSE:Leap 15.6python3-libmountbefore 2.37.4-150500.9.23.12.37.4-150500.9.23.1
openSUSE:Leap 15.6util-linuxbefore 2.37.4-150500.9.23.12.37.4-150500.9.23.1
openSUSE:Leap 15.6util-linuxbefore 2.39.3-150600.4.18.12.39.3-150600.4.18.1
openSUSE:Leap 15.6util-linux-systemdbefore 2.39.3-150600.4.18.12.39.3-150600.4.18.1
openSUSE:Leap 16.0python-libmountbefore 2.41.1-160000.3.12.41.1-160000.3.1
openSUSE:Leap 16.0util-linuxbefore 2.41.1-160000.3.12.41.1-160000.3.1
openSUSE:Leap 16.0util-linux-systemdbefore 2.41.1-160000.3.12.41.1-160000.3.1
openSUSE:Tumbleweedutil-linuxbefore 2.41.3-4.12.41.3-4.1
Red Hat:hummingbird:1util-linuxbefore 0:2.42-7.1.hum10:2.42-7.1.hum1
Red Hat:hummingbird:1util-linux-corebefore 0:2.42-7.1.hum10:2.42-7.1.hum1
Red Hat:hummingbird:1util-linux-i18nbefore 0:2.42-7.1.hum10:2.42-7.1.hum1
Red Hat:hummingbird:1util-linux-scriptbefore 0:2.42-7.1.hum10:2.42-7.1.hum1
SUSE:Linux Enterprise Micro 5.2util-linuxbefore 2.36.2-150300.4.53.12.36.2-150300.4.53.1
SUSE:Linux Enterprise Micro 5.2util-linuxbefore 2.36.2-150300.4.58.12.36.2-150300.4.58.1
SUSE:Linux Enterprise Micro 5.2util-linux-systemdbefore 2.36.2-150300.4.58.12.36.2-150300.4.58.1
SUSE:Linux Enterprise Micro 5.2util-linux-systemdbefore 2.36.2-150300.4.53.12.36.2-150300.4.53.1
SUSE:Linux Enterprise Micro 5.3util-linuxbefore 2.37.2-150400.8.41.12.37.2-150400.8.41.1
SUSE:Linux Enterprise Micro 5.3util-linux-systemdbefore 2.37.2-150400.8.41.12.37.2-150400.8.41.1
SUSE:Linux Enterprise Micro 5.5util-linuxbefore 2.37.4-150500.9.23.12.37.4-150500.9.23.1
SUSE:Linux Enterprise Micro 5.5util-linux-systemdbefore 2.37.4-150500.9.23.12.37.4-150500.9.23.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7util-linuxbefore 2.40.4-150700.4.10.12.40.4-150700.4.10.1

+11

Same product

kernel: all records

Other highest-scoring records for the same primary product.

  • CVE-2015-5224The mkostemp function in login-utils in util-linux when used incorrectly allows remote attackers to cause file name collision and possibly o
    40Plan
  • CVE-2018-7738In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name
    31Monitor
  • CVE-2016-2779runuser in util-linux allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the te
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-21583Aug 22, 2023 · An issue was discovered in hwclock.13-v2.27 allows attackers to gain escalated privlidges or execute arbitrary commands via the path paramet
    26Monitor
  • ← EarlierCVE-2024-28085Mar 27, 2024 · wall in util-linux through 2.40, often installed with setgid tty permissions, allows escape sequences to be sent to other users' terminals t
    14Monitor
  • Later →CVE-2026-27456Apr 3, 2026 · util-linux: TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 util-linux 2.40.2-3 on Azure Linux 3.02.40.2-4 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 util-linux 2.40.2-4 on Azure Linux 3.02.40.2-4 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 util-linux 2.37.4-10 on CBL Mariner 2.02.37.4-11 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 util-linux 2.37.4-10 on CBL-Mariner 2.02.37.4-11 · Release NotesMicrosoft (MSRC)
debian:util-linux2.42-1 · Debian:14Package registry (OSV)
opensuse:python-libmount2.39.3-150600.4.18.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:python3-libmount2.37.4-150500.9.23.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:util-linux2.37.4-150500.9.23.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:util-linux2.39.3-150600.4.18.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:util-linux-systemd2.39.3-150600.4.18.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:libblkid0:2.42-7.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:util-linux0:2.42-7.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:util-linux-core0:2.42-7.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:util-linux-i18n0:2.42-7.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:util-linux-script0:2.42-7.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:python-libmount2.33.2-4.51.2 · SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5Package registry (OSV)
suse:util-linux2.37.4-150500.9.23.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:util-linux-systemd2.37.4-150500.9.23.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-289 · Authentication Bypass by Alternate Name

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records