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Unity Linux 20.1070e Security Update: kernel (UTSA-2026-005464)

medium Nessus Plugin ID 300541

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-2026-005464 advisory.

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

 virtio_net: Fix napi_skb_cache_put warning

 After the commit bdacf3e34945 (net: Use nested-BH locking for napi_alloc_cache.) was merged, the following warning began to appear:

 WARNING: CPU: 5 PID: 1 at net/core/skbuff.c:1451 napi_skb_cache_put+0x82/0x4b0

 __warn+0x12f/0x340 napi_skb_cache_put+0x82/0x4b0 napi_skb_cache_put+0x82/0x4b0 report_bug+0x165/0x370 handle_bug+0x3d/0x80 exc_invalid_op+0x1a/0x50 asm_exc_invalid_op+0x1a/0x20
 __free_old_xmit+0x1c8/0x510 napi_skb_cache_put+0x82/0x4b0
 __free_old_xmit+0x1c8/0x510
 __free_old_xmit+0x1c8/0x510
 __pfx___free_old_xmit+0x10/0x10

 The issue arises because virtio is assuming it's running in NAPI context even when it's not, such as in the netpoll case.

 To resolve this, modify virtnet_poll_tx() to only set NAPI when budget is available. Same for virtnet_poll_cleantx(), which always assumed that it was in a NAPI context.

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?97b20d2b

http://www.nessus.org/u?a54d1fee

https://nvd.nist.gov/vuln/detail/CVE-2024-43835

Plugin Details

Severity: Medium

ID: 300541

File Name: unity_linux_UTSA-2026-005464.nasl

Version: 1.1

Type: local

Published: 3/4/2026

Updated: 3/4/2026

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-2024-43835

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: 3/2/2026

Vulnerability Publication Date: 8/17/2024

Reference Information

CVE: CVE-2024-43835