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Unity Linux 20.1050e Security Update: kernel (UTSA-2026-005052)

high Nessus Plugin ID 296847

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-2026-005052 advisory.

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

 net: fix __dst_negative_advice() race

 __dst_negative_advice() does not enforce proper RCU rules when sk->dst_cache must be cleared, leading to possible UAF.

 RCU rules are that we must first clear sk->sk_dst_cache, then call dst_release(old_dst).

 Note that sk_dst_reset(sk) is implementing this protocol correctly, while __dst_negative_advice() uses the wrong order.

 Given that ip6_negative_advice() has special logic against RTF_CACHE, this means each of the three ->negative_advice() existing methods must perform the sk_dst_reset() themselves.

 Note the check against NULL dst is centralized in
 __dst_negative_advice(), there is no need to duplicate it in various callbacks.

 Many thanks to Clement Lecigne for tracking this issue.

 This old bug became visible after the blamed commit, using UDP sockets.

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?b4e07fbc

https://nvd.nist.gov/vuln/detail/CVE-2024-36971

Plugin Details

Severity: High

ID: 296847

File Name: unity_linux_UTSA-2026-005052.nasl

Version: 1.1

Type: local

Published: 1/27/2026

Updated: 1/27/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.6

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

CVSS Score Source: CVE-2024-36971

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.2

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:F/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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/27/2026

Vulnerability Publication Date: 6/10/2024

CISA Known Exploited Vulnerability Due Dates: 8/28/2024

Reference Information

CVE: CVE-2024-36971