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.

An update of the util package has been released.

According to the versions of the util-linux packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-     Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The     mount binary, when setting up loop devices, validates the source file path with user privileges via fork()     + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0)     without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor     inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the     source file with a symlink pointing to any root-owned file or device during the race window, causing the     SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options     whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the     SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized     read access to root-protected files and block devices, including backup images, disk volumes, and any file     containing a valid filesystem. This issue has been patched in version 2.41.4.(CVE-2026-27456)

    VUL-0: CVE-2026-3184: util-linux: access control bypass due to improper hostname canonicalization in     `login`(CVE-2026-3184)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization util-linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the util-linux packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-     Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The     mount binary, when setting up loop devices, validates the source file path with user privileges via fork()     + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0)     without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor     inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the     source file with a symlink pointing to any root-owned file or device during the race window, causing the     SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options     whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the     SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized     read access to root-protected files and block devices, including backup images, disk volumes, and any file     containing a valid filesystem. This issue has been patched in version 2.41.4.(CVE-2026-27456)

    VUL-0: CVE-2026-3184: util-linux: access control bypass due to improper hostname canonicalization in     `login`(CVE-2026-3184)

Tenable has extracted the preceding description block directly from the EulerOS util-linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the util-linux packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    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.(CVE-2026-3184)

Tenable has extracted the preceding description block directly from the EulerOS util-linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the util-linux packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    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.(CVE-2026-3184)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization util-linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the util-linux packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    A vulnerability exists in util-linux package that allows access control bypass due to improper hostname     canonicalization.(CVE-2026-3184)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization util-linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1406-1 advisory.

    Security issue:

    - CVE-2026-3184: access control bypass due to improper hostname canonicalization in `login` (bsc#1258859).

    Non security issues:

    - recognize fuse 'portal' as a virtual file system (bsc#1234736).
    - fdisk: fix possible partition overlay and data corruption if EBR gap is missing (bsc#1222465).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2026:1370-1 advisory.

    - CVE-2026-3184: Fix full hostname usage for PAM to ensure correct access control for 'login -h'     (bsc#1258859).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 15 host has a package installed that is affected by a vulnerability as referenced in the SUSE- SU-2026:0856-1 advisory.

    - CVE-2026-3184: Fix full hostname usage for PAM to ensure correct access control for 'login -h'     (bsc#1258859).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2026:0803-1 advisory.

    - CVE-2026-3184: Fix full hostname usage for PAM to ensure correct access control for 'login -h'     (bsc#1258859).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-3184)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
321784	Photon OS 5.0: Util PHSA-2026-5.0-0885	Nessus	PhotonOS Local Security Checks	medium
320709	EulerOS Virtualization 2.13.0 : util-linux (EulerOS-SA-2026-2420)	Nessus	Huawei Local Security Checks	medium
320699	EulerOS Virtualization 2.13.1 : util-linux (EulerOS-SA-2026-2391)	Nessus	Huawei Local Security Checks	medium
320291	EulerOS 2.0 SP13 : util-linux (EulerOS-SA-2026-2317)	Nessus	Huawei Local Security Checks	medium
320227	EulerOS 2.0 SP13 : util-linux (EulerOS-SA-2026-2360)	Nessus	Huawei Local Security Checks	medium
319968	EulerOS 2.0 SP11 : util-linux (EulerOS-SA-2026-2231)	Nessus	Huawei Local Security Checks	medium
319948	EulerOS 2.0 SP11 : util-linux (EulerOS-SA-2026-2268)	Nessus	Huawei Local Security Checks	medium
319430	EulerOS Virtualization 2.10.1 : util-linux (EulerOS-SA-2026-2038)	Nessus	Huawei Local Security Checks	medium
319428	EulerOS Virtualization 2.10.0 : util-linux (EulerOS-SA-2026-2065)	Nessus	Huawei Local Security Checks	medium
319422	EulerOS Virtualization 2.12.0 : util-linux (EulerOS-SA-2026-2115)	Nessus	Huawei Local Security Checks	medium
319380	EulerOS Virtualization 2.12.1 : util-linux (EulerOS-SA-2026-2090)	Nessus	Huawei Local Security Checks	medium
306886	SUSE SLED15 / SLES15 Security Update : util-linux (SUSE-SU-2026:1406-1)	Nessus	SuSE Local Security Checks	medium
306695	SUSE SLES12 Security Update : util-linux (SUSE-SU-2026:1370-1)	Nessus	SuSE Local Security Checks	medium
301803	openSUSE 15 Security Update : util-linux (SUSE-SU-2026:0856-1)	Nessus	SuSE Local Security Checks	low
301295	openSUSE 15 Security Update : util-linux (SUSE-SU-2026:0803-1)	Nessus	SuSE Local Security Checks	low
300049	Linux Distros Unpatched Vulnerability : CVE-2026-3184	Nessus	Misc.	medium

Detections

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CVE-2026-3184

medium

Tenable Plugins

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