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。

  - 在 Linux 内核中的 io_uring 中发现释放后使用缺陷其中具有用户权限的本地攻击者可能会造成系统拒绝服务问题此问题源于对 版之前对象的存在性缺少验证通过在使用时不递增文件引用计数器来对对象执行操作。此漏洞对数据完整性、机密性和系统可用性威胁最大。(CVE-2021-20226)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

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。

  - 在 Linux 核心的 io_uring 中發現一個釋放後使用缺陷具有使用者權限的本機攻擊者可對系統造成拒絕服務問題。此問題是因為在 之前未驗證物件是否存在使用時不遞增檔案參照計數器藉此在物件上執行作業。此弱點對資料完整性、機密性以及系統可用性的威脅最大。(CVE-2021-20226)

請注意，Nessus 依賴供應商報告的套件存在。

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 カーネルの io_uring で、use-after-free の欠陥が見つかりました。ユーザー権限を持つローカルの攻撃者が、システムのサービス拒否問題を引き起こす可能性があります。この問題は、 より前のオブジェクトの存在を検証しないことに起因します。使用中にファイル参照カウンターを増分しないでオブジェクト上で操作を行うことを発見しました。この脆弱性が最大の脅威となるのは、データの整合性、機密性、およびシステムの可用性です。(CVE-2021-20226)

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。

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-004478 advisory.

    A use-after-free flaw was found in the io_uring in Linux kernel, where a local attacker with a user     privilege could cause a denial of service problem on the system The issue results from the lack of     validating the existence of an object prior to performing operations on the object by not incrementing the     file reference counter while in use. The highest threat from this vulnerability is to data integrity,     confidentiality and system availability.

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.

  - A use-after-free flaw was found in the io_uring in Linux kernel, where a local attacker with a user     privilege could cause a denial of service problem on the system The issue results from the lack of     validating the existence of an object prior to performing operations on the object by not incrementing the     file reference counter while in use. The highest threat from this vulnerability is to data integrity,     confidentiality and system availability. (CVE-2021-20226)

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-003841 advisory.

    A use-after-free flaw was found in the io_uring in Linux kernel, where a local attacker with a user     privilege could cause a denial of service problem on the system The issue results from the lack of     validating the existence of an object prior to performing operations on the object by not incrementing the     file reference counter while in use. The highest threat from this vulnerability is to data integrity,     confidentiality and system availability.

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
248323	Linux Distros 未修补的漏洞：CVE-2021-20226	Nessus	Misc.	2025/8/11	2025/8/11	high
248323	Linux Distros 未修補的弱點：CVE-2021-20226	Nessus	Misc.	2025/8/11	2025/8/11	high
248323	Linux Distros のパッチ未適用の脆弱性: CVE-2021-20226	Nessus	Misc.	2025/8/11	2025/8/11	high
290179	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-004478)	Nessus	Unity Linux Local Security Checks	2026/1/16	2026/1/16	high
248323	Linux Distros Unpatched Vulnerability : CVE-2021-20226	Nessus	Misc.	2025/8/11	2025/8/11	high
288520	Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-003841)	Nessus	Unity Linux Local Security Checks	2026/1/16	2026/1/17	high

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