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Unity Linux 20.1050e Security Update: kernel (UTSA-2026-007517)

medium Nessus Plugin ID 307150

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-2026-007517 advisory.

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

 wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()

 There is a potential NULL pointer dereference in zd_mac_tx_to_dev(). For example, the following is possible:

 T0 T1 zd_mac_tx_to_dev() /* len == skb_queue_len(q) */ while (len > ZD_MAC_MAX_ACK_WAITERS) {

 filter_ack() spin_lock_irqsave(&q->lock, flags);
 /* position == skb_queue_len(q) */ for (i=1; i<position; i++) skb = __skb_dequeue(q)

 if (mac->type == NL80211_IFTYPE_AP) skb = __skb_dequeue(q);
 spin_unlock_irqrestore(&q->lock, flags);

 skb_dequeue() -> NULL

 Since there is a small gap between checking skb queue length and skb being unconditionally dequeued in zd_mac_tx_to_dev(), skb_dequeue() can return NULL.
 Then the pointer is passed to zd_mac_tx_status() where it is dereferenced.

 In order to avoid potential NULL pointer dereference due to situations like above, check if skb is not NULL before passing it to zd_mac_tx_status().

 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?e52edd84

http://www.nessus.org/u?c0f7d511

https://nvd.nist.gov/vuln/detail/CVE-2025-38513

Plugin Details

Severity: Medium

ID: 307150

File Name: unity_linux_UTSA-2026-007517.nasl

Version: 1.1

Type: Local

Published: 4/17/2026

Updated: 4/17/2026

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-2025-38513

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/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/17/2026

Vulnerability Publication Date: 8/5/2025

Reference Information

CVE: CVE-2025-38513