Detections
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RockyLinux 8 : flatpak (RLSA-2026:21756)

critical Nessus Plugin ID 317744

Synopsis

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

Description

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:21756 advisory.

 * flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options (CVE-2026-34078)

 * flatpak: Flatpak: Arbitrary file deletion on host via improper cache file path validation (CVE-2026-34079)

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

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

Solution

Update the affected packages.

See Also

https://errata.rockylinux.org/RLSA-2026:21756

https://bugzilla.redhat.com/show_bug.cgi?id=2456276

https://bugzilla.redhat.com/show_bug.cgi?id=2456284

Plugin Details

Severity: Critical

ID: 317744

File Name: rocky_linux_RLSA-2026-21756.nasl

Version: 1.1

Type: Local

Published: 5/29/2026

Updated: 5/29/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-34078

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.1

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:rocky:linux:flatpak-session-helper, p-cpe:/a:rocky:linux:flatpak-libs-debuginfo, p-cpe:/a:rocky:linux:flatpak-selinux, p-cpe:/a:rocky:linux:flatpak-session-helper-debuginfo, p-cpe:/a:rocky:linux:flatpak, p-cpe:/a:rocky:linux:flatpak-debuginfo, p-cpe:/a:rocky:linux:flatpak-debugsource, p-cpe:/a:rocky:linux:flatpak-devel, cpe:/o:rocky:linux:8, p-cpe:/a:rocky:linux:flatpak-libs

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/29/2026

Vulnerability Publication Date: 4/7/2026

Reference Information

CVE: CVE-2026-34078, CVE-2026-34079