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Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992294)

medium Nessus Plugin ID 280582

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-992294 advisory.

 In the Linux kernel, the following vulnerability has been resolved:

 fs/jfs: Prevent integer overflow in AG size calculation

 The JFS filesystem calculates allocation group (AG) size using 1 << l2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB aggregates on 32-bit systems), this 32-bit shift operation causes undefined behavior and improper AG sizing.

 On 32-bit architectures:
 - Left-shifting 1 by 32+ bits results in 0 due to integer overflow
 - This creates invalid AG sizes (0 or garbage values) in sbi->bmap->db_agsize
 - Subsequent block allocations would reference invalid AG structures
 - Could lead to:
 - Filesystem corruption during extend operations
 - Kernel crashes due to invalid memory accesses
 - Security vulnerabilities via malformed on-disk structures

 Fix by casting to s64 before shifting:
 bmp->db_agsize = (s64)1 << l2agsize;

 This ensures 64-bit arithmetic even on 32-bit architectures. The cast matches the data type of db_agsize (s64) and follows similar patterns in JFS block calculation code.

 Found by Linux Verification Center (linuxtesting.org) with SVACE.

Tenable has extracted the preceding description block directly from the Unity 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.

Solution

Update the affected kernel package.

See Also

http://www.nessus.org/u?f0257e32

http://www.nessus.org/u?b3341f0c

https://nvd.nist.gov/vuln/detail/CVE-2025-37858

Plugin Details

Severity: Medium

ID: 280582

File Name: unity_linux_UTSA-2025-992294.nasl

Version: 1.1

Type: local

Published: 12/30/2025

Updated: 12/30/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2025-37858

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

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

Vulnerability Information

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

Exploit Ease: No known exploits are available

Patch Publication Date: 12/30/2025

Vulnerability Publication Date: 5/5/2025

Reference Information

CVE: CVE-2025-37858