Linux：フロントエンド「be-alloc」モードの表示が未サポート（コメントのみ）[XSA-363、CVE-2021-26934]（#1929549）arm：新しく割り当てられたスクラブしたページのキャッシュが消去されない可能性があります[XSA-364、CVE-2021-26933]（#1929547）

注意：Tenable Network Securityは、前述の記述ブロックをFedora更新システムのWebサイトから直接抽出しています。
Tenableでは、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

The remote Fedora 33 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-47f53a940a advisory.

  - An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory     accesses are bypassing the cache. This means that Xen needs to ensure that all writes (such as the ones     during scrubbing) have reached the memory before handing over the page to a guest. Unfortunately, the     operation to clean the cache is happening before checking if the page was scrubbed. Therefore there is no     guarantee when all the writes will reach the memory. (CVE-2021-26933)

  - An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen. The backend allocation     (aka be-alloc) mode of the drm_xen_front drivers was not meant to be a supported configuration, but this     wasn't stated accordingly in its support status entry. (CVE-2021-26934)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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 Xen 所使用的 Linux 核心 4.18 至 5.10.16 版本中發現一個問題。drm_xen_front 驅動程式的後端配置 (即 be-alloc) 模式不應是受支援的組態，但其並未在其支援狀態項目中進行相應陳述。 (CVE-2021-26934)

請注意，Nessus 依賴供應商報告的套件存在。

The remote Fedora 32 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-4c819bf1ad advisory.

  - An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory     accesses are bypassing the cache. This means that Xen needs to ensure that all writes (such as the ones     during scrubbing) have reached the memory before handing over the page to a guest. Unfortunately, the     operation to clean the cache is happening before checking if the page was scrubbed. Therefore there is no     guarantee when all the writes will reach the memory. (CVE-2021-26933)

  - An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen. The backend allocation     (aka be-alloc) mode of the drm_xen_front drivers was not meant to be a supported configuration, but this     wasn't stated accordingly in its support status entry. (CVE-2021-26934)

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.

  - An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen. The backend allocation     (aka be-alloc) mode of the drm_xen_front drivers was not meant to be a supported configuration, but this     wasn't stated accordingly in its support status entry. (CVE-2021-26934)

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

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 Xen 使用的 Linux 内核 5.10.16 及之前的 4.18 版本中发现一个问题。drm_xen_front 驱动程序的后端分配（又称为 be-alloc）模式不应为受支持的配置，但是在其支持状态条目中未作相应说明。 (CVE-2021-26934)

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 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。

  - Xenが使用する際、Linuxカーネル4.18から5.10.16までに問題が発見されました。drm_xen_front ドライバーのバックエンド割り当て（別名 be-alloc）モードは、サポートされる構成ではありませんでしたが、サポートステータスのエントリに適切に記載されていませんでした。 （CVE-2021-26934）

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。

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
146913	Fedora 33：xen（2021-47f53a940a）	Nessus	Fedora Local Security Checks	2021/3/1	2021/4/12	high
146913	Fedora 33 : xen (2021-47f53a940a)	Nessus	Fedora Local Security Checks	2021/3/1	2021/4/12	high
223696	Linux Distros 未修補弱點：CVE-2021-26934	Nessus	Misc.	2025/3/4	2025/9/5	high
146901	Fedora 32 : xen (2021-4c819bf1ad)	Nessus	Fedora Local Security Checks	2021/3/1	2021/4/12	high
223696	Linux Distros Unpatched Vulnerability : CVE-2021-26934	Nessus	Misc.	2025/3/4	2025/9/5	high
223696	Linux Distros 未修补的漏洞: CVE-2021-26934	Nessus	Misc.	2025/3/4	2025/9/5	high
146901	Fedora 32：xen（2021-4c819bf1ad）	Nessus	Fedora Local Security Checks	2021/3/1	2021/4/12	high
223696	Linux Distros のパッチ未適用の脆弱性: CVE-2021-26934	Nessus	Misc.	2025/3/4	2025/9/5	high

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