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Fedora 43 : util-linux (2026-840b40ef4c)

medium Nessus Plugin ID 307050

Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-840b40ef4c advisory.

 upstream update, fixes security-related bugs

 CVE-2026-27456 - mount(8) TOCTOU symlink attack via loop device.
 The SUID mount follows symlinks when resolving loop backing file paths. On systems where non-root users are permitted to mount loop devices (via 'user' option in fstab), this allows access to arbitrary files.

 CWE-190 - Integer overflow in libblkid parse_dos_extended().
 A crafted MBR disk image can cause uint32_t wraparound in EBR chain processing, causing reported partitions to not match the on-disk layout. Tools like udisks may then register a partition at logical sector 0.


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

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

Solution

Update the affected util-linux package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-840b40ef4c

Plugin Details

Severity: Medium

ID: 307050

File Name: fedora_2026-840b40ef4c.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/17/2026

Updated: 4/17/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.1

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

Vector: CVSS2#AV:L/AC:H/Au:S/C:C/I:N/A:N

CVSS Score Source: CVE-2026-27456

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:fedoraproject:fedora:util-linux, cpe:/o:fedoraproject:fedora:43

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/1/2026

Vulnerability Publication Date: 4/1/2026

Reference Information

CVE: CVE-2026-27456