In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-989803 advisory.

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

    can: j1939: fix Use-after-Free, hold skb ref while in use

    This patch fixes a Use-after-Free found by the syzbot.

    The problem is that a skb is taken from the per-session skb queue,     without incrementing the ref count. This leads to a Use-after-Free if     the skb is taken concurrently from the session queue due to a CTS.

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.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-986970 advisory.

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

    can: j1939: fix Use-after-Free, hold skb ref while in use

    This patch fixes a Use-after-Free found by the syzbot.

    The problem is that a skb is taken from the per-session skb queue,     without incrementing the ref count. This leads to a Use-after-Free if     the skb is taken concurrently from the session queue due to a CTS.

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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold     skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is     taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free     if the skb is taken concurrently from the session queue due to a CTS. (CVE-2021-47232)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
273111	Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989803)	Nessus	Unity Linux Local Security Checks	high
268805	Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986970)	Nessus	Unity Linux Local Security Checks	high
239541	TencentOS Server 2: kernel (TSSA-2024:1029)	Nessus	Tencent Local Security Checks	high
239155	TencentOS Server 3: kernel (TSSA-2024:1028)	Nessus	Tencent Local Security Checks	high
229851	Linux Distros Unpatched Vulnerability : CVE-2021-47232	Nessus	Misc.	high

Detections

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CVE-2021-47232

high

Tenable Plugins

high

high

high

high

high