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AlmaLinux 9.2 [TuxCare] Security Update: tar (ALMALINUX9.2:CLSA-2026:1787337920)

medium Nessus Plugin ID 360189

Synopsis

The AlmaLinux host is missing one or more security updates.

Description

The AlmaLinux 9.2 host has a package installed that is affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1787337920 advisory.

 - A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflowsincluding extracting into a newly created directory without using the -P option do not mitigate the issue. (CVE-2026-18477)

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 tar package based on the guidance in TuxCare advisory ALMALINUX9.2:CLSA-2026:1787337920.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1787337920

http://www.nessus.org/u?abc29cca

Plugin Details

Severity: Medium

ID: 360189

File Name: tuxcare_alma_linux_9.2_CLSA-2026-1787337920.nasl

Version: 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

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

CVSS Score Source: CVE-2026-18477

CVSS v3

Risk Factor: Medium

Base Score: 4.4

Temporal Score: 3.9

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

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

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/OS/extended-third-party

Exploit Ease: No known exploits are available

Patch Publication Date: 8/21/2026

Vulnerability Publication Date: 8/3/2026

Reference Information

CVE: CVE-2026-18477

CLSA: 2026:1787337920