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Unity Linux 20.1060e Security Update: kernel (UTSA-2026-011338)

medium Nessus Plugin ID 308800

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-2026-011338 advisory.

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

 net: fix stack overflow when LRO is disabled for virtual interfaces

 When the virtual interface's feature is updated, it synchronizes the updated feature for its own lower interface.
 This propagation logic should be worked as the iteration, not recursively.
 But it works recursively due to the netdev notification unexpectedly.
 This problem occurs when it disables LRO only for the team and bonding interface type.

 team0 | +------+------+-----+-----+ | | | | | team1 team2 team3 ... team200

 If team0's LRO feature is updated, it generates the NETDEV_FEAT_CHANGE event to its own lower interfaces(team1 ~ team200).
 It is worked by netdev_sync_lower_features().
 So, the NETDEV_FEAT_CHANGE notification logic of each lower interface work iteratively.
 But generated NETDEV_FEAT_CHANGE event is also sent to the upper interface too.
 upper interface(team0) generates the NETDEV_FEAT_CHANGE event for its own lower interfaces again.
 lower and upper interfaces receive this event and generate this event again and again.
 So, the stack overflow occurs.

 But it is not the infinite loop issue.
 Because the netdev_sync_lower_features() updates features before generating the NETDEV_FEAT_CHANGE event.
 Already synchronized lower interfaces skip notification logic.
 So, it is just the problem that iteration logic is changed to the recursive unexpectedly due to the notification mechanism.

 Reproducer:

 ip link add team0 type team ethtool -K team0 lro on for i in {1..200} do ip link add team$i master team0 type team ethtool -K team$i lro on done

 ethtool -K team0 lro off

 In order to fix it, the notifier_ctx member of bonding/team is introduced.

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?6a8669ab

http://www.nessus.org/u?06d6a7c8

https://nvd.nist.gov/vuln/detail/CVE-2023-54012

Plugin Details

Severity: Medium

ID: 308800

File Name: unity_linux_UTSA-2026-011338.nasl

Version: 1.1

Type: Local

Published: 4/21/2026

Updated: 4/21/2026

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-2023-54012

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: 4/20/2026

Vulnerability Publication Date: 7/21/2021

Reference Information

CVE: CVE-2023-54012