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: xen-netback: take a reference to the     RX task thread Do this in order to prevent the task from being freed if the thread returns (which can be     triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not     taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but     dropped as part of the rework done in 2ac061ce97f4. Reintroduce the reference taking and add a comment     this time explaining why it's needed. This is XSA-374 / CVE-2021-28691. (CVE-2021-47111)

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

Linux/Unix ホストには、ベンダーが提供するパッチが利用できない脆弱性の影響を受ける複数のパッケージがインストールされています。

  - Linux カーネルでは、以下の脆弱性が解決されています: xen-netback: take a reference to the RX task thread Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97f4. Reintroduce the reference taking and add a comment this time explaining why it's needed. This is XSA-374 / CVE-2021-28691. (CVE-2021-47111)

Nessus は、ベンダーによって報告されたパッケージの存在に依存していることに注意してください。

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - 已解決 Linux 核心中的下列弱點：xen-netback: take a reference to the RX task thread Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97f4. Reintroduce the reference taking and add a comment this time explaining why it's needed. This is XSA-374 / CVE-2021-28691. (CVE-2021-47111)

請注意，Nessus 依賴供應商報告的套件存在。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - 已修复 Linux 内核中的下列漏洞：xen-netback: take a reference to the RX task thread Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97f4. Reintroduce the reference taking and add a comment this time explaining why it's needed. This is XSA-374 / CVE-2021-28691. (CVE-2021-47111)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

ID	Name	Product	Family	Published	Updated	Severity
246652	Linux Distros Unpatched Vulnerability : CVE-2021-47111	Nessus	Misc.	8/9/2025	8/9/2025	high
246652	Linux Distros のパッチ未適用の脆弱性: CVE-2021-47111	Nessus	Misc.	8/9/2025	8/9/2025	high
246652	Linux Distros 未修補的弱點：CVE-2021-47111	Nessus	Misc.	8/9/2025	8/9/2025	high
246652	Linux Distros 未修补的漏洞：CVE-2021-47111	Nessus	Misc.	8/9/2025	8/9/2025	high
160459	Amazon Linux 2 : kernel (ALASKERNEL-5.10-2022-002)	Nessus	Amazon Linux Local Security Checks	5/2/2022	6/23/2025	high
160459	Amazon Linux 2 : kernel (ALASKERNEL-5.10-2022-002)	Nessus	Amazon Linux Local Security Checks	5/2/2022	6/23/2025	high
160459	Amazon Linux 2：内核 (ALASKERNEL-5.10-2022-002)	Nessus	Amazon Linux Local Security Checks	5/2/2022	6/23/2025	high
160459	Amazon Linux 2：kernel (ALASKERNEL-5.10-2022-002)	Nessus	Amazon Linux Local Security Checks	5/2/2022	6/23/2025	high

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