Detections
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Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libevent (UTSA-2026-106192)
medium Nessus Plugin ID 342870
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-2026-106192 advisory.Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a use-after-free in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero.
evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer.
A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
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 libevent package.See Also
https://atomgit.com/src-openeuler/libevent/issues/30
Plugin Details
Severity: Medium
ID: 342870
File Name: unity_linux_UTSA-2026-106192.nasl
Version: 1.1
Type: Local
Published: 9/4/2026
Updated: 9/4/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.9
Percentile: 58.18
CVSS v2
Risk Factor: High
Base Score: 9.7
Temporal Score: 7.2
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:P
CVSS Score Source: CVE-2026-63381
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 6.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 5.8
Threat Score: 2
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 9/4/2026
Vulnerability Publication Date: 8/20/2026
Reference Information
CVE: CVE-2026-63381