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このページは Ubuntu 向けの修正状況です。脆弱性そのものの説明は CVE 本体のページにあります。 CVE-2022-50256 の詳細 →
カテゴリ
UBUNTU-CVE-2022-50256

linux の脆弱性 (UBUNTU-CVE-2022-50256)

概要

linux に 脆弱性 (UBUNTU-CVE-2022-50256) が存在。悪用されるとシステム全体を乗っ取られる可能性があります。

原文の説明

取得元が公開している説明をそのまま載せています (多くは英語)。

In the Linux kernel, the following vulnerability has been resolved: drm/meson: remove drm bridges at aggregate driver unbind time drm bridges added by meson_encoder_hdmi_init and meson_encoder_cvbs_init were not manually removed at module unload time, which caused dangling references to freed memory to remain linked in the global bridge_list. When loading the driver modules back in, the same functions would again call drm_bridge_add, and when traversing the global bridge_list, would end up peeking into freed memory. Once again KASAN revealed the problem: [ +0.000095] ============================================================= [ +0.000008] BUG: KASAN: use-after-free in __list_add_valid+0x9c/0x120 [ +0.000018] Read of size 8 at addr ffff00003da291f0 by task modprobe/2483 [ +0.000018] CPU: 3 PID: 2483 Comm: modprobe Tainted: G C O 5.19.0-rc6-lrmbkasan+ #1 [ +0.000011] Hardware name: Hardkernel ODROID-N2Plus (DT) [ +0.000008] Call trace: [ +0.000006] dump_backtrace+0x1ec/0x280 [ +0.000012] show_stack+0x24/0x80 [ +0.000008] dump_stack_lvl+0x98/0xd4 [ +0.000011] print_address_description.constprop.0+0x80/0x520 [ +0.000011] print_report+0x128/0x260 [ +0.000008] kasan_report+0xb8/0xfc [ +0.000008] __asan_report_load8_noabort+0x3c/0x50 [ +0.000009] __list_add_valid+0x9c/0x120 [ +0.000009] drm_bridge_add+0x6c/0x104 [drm] [ +0.000165] dw_hdmi_probe+0x1900/0x2360 [dw_hdmi] [ +0.000022] meson_dw_hdmi_bind+0x520/0x814 [meson_dw_hdmi] [ +0.000014] com…

出典: OSV.dev (Open Source Vulnerabilities) OSV

自動生成の要約

取得元のデータ (CVSS・CWE・影響バージョンなど) から SecPulse が定型文で組み立てた要約です。AI は使っていません。正確な内容は下の原文と参照URLで確認してください。

linux という製品で、UBUNTU-CVE-2022-50256 という番号がついた弱点 (脆弱性) が見つかりました。
悪用されるとシステム全体を乗っ取られる可能性があります。
対策: ベンダー公式の修正版に更新してください。
心配なら、システム担当者や製品の公式サイトで「linux UBUNTU-CVE-2022-50256」を検索してください。

UBUNTU-CVE-2022-50256 (linux)
攻撃ベクター: ローカル / 被害者操作不要
対応方針: 1) SBOMで影響バージョン横断確認, 2) ステージング検証→本番更新, 3) WAF/プロキシで該当エンドポイントを監視, 4) ログでIOC調査。
参考: 当ページの『参照URL』の GHSA / vendor advisory / patched release を参照。

❓ 何が問題か

linux に 脆弱性 (分類未定) があります。

📍 影響範囲

linux の影響バージョンはベンダーのアドバイザリで確認してください。

🔥 重要度

重要度: ?。悪用されるとシステム全体を乗っ取られる可能性があります。

🔧 修正方法

ベンダー公式アドバイザリの修正版に更新してください。

🛡️ 暫定回避

修正版が未提供時は、影響機能の無効化・WAFルール・ネットワークACLでの遮断を検討。

🔍 検知方法

Webサーバ・プロキシ・WAFログで該当CVEのIOCに合致する不審リクエストを検索。SBOM/依存ファイルで影響バージョンを横断確認。

対応アクション

SOC/SREチームが順番に実行すべき具体的なステップとコマンド例

  1. 1
    影響範囲の特定 identify
    grep -r 'linux' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で linux を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    事後検証 verify
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

影響パッケージ

Ubuntu:Pro:14.04:LTS linux
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Ubuntu:Pro:14.04:LTS linux-aws
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Ubuntu:Pro:14.04:LTS linux-azure
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Ubuntu:Pro:14.04:LTS linux-lts-xenial
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Ubuntu:Pro:16.04:LTS linux
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Ubuntu:Pro:16.04:LTS linux-aws
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Ubuntu:Pro:16.04:LTS linux-aws-hwe
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Ubuntu:Pro:16.04:LTS linux-azure
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Ubuntu:Pro:16.04:LTS linux-gcp
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Ubuntu:Pro:16.04:LTS linux-hwe
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Ubuntu:16.04:LTS linux-hwe-edge
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Ubuntu:Pro:16.04:LTS linux-kvm
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Ubuntu:Pro:16.04:LTS linux-oracle
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Ubuntu:Pro:FIPS:16.04:LTS linux-fips
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Ubuntu:Pro:18.04:LTS linux
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Ubuntu:Pro:18.04:LTS linux-aws
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Ubuntu:18.04:LTS linux-aws-5.0
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Ubuntu:18.04:LTS linux-aws-5.3
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Ubuntu:Pro:18.04:LTS linux-aws-5.4
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Ubuntu:18.04:LTS linux-azure
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Ubuntu:Pro:18.04:LTS linux-azure-4.15
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Ubuntu:18.04:LTS linux-azure-5.3
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Ubuntu:Pro:18.04:LTS linux-azure-5.4
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Ubuntu:18.04:LTS linux-azure-edge
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Ubuntu:18.04:LTS linux-gcp
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Ubuntu:Pro:18.04:LTS linux-gcp-4.15
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Ubuntu:18.04:LTS linux-gcp-5.3
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Ubuntu:Pro:18.04:LTS linux-gcp-5.4
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Ubuntu:18.04:LTS linux-gke-4.15
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Ubuntu:18.04:LTS linux-gke-5.4
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Ubuntu:18.04:LTS linux-gkeop-5.4
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Ubuntu:18.04:LTS linux-hwe
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Ubuntu:Pro:18.04:LTS linux-hwe-5.4
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Ubuntu:18.04:LTS linux-hwe-edge
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Ubuntu:Pro:18.04:LTS linux-ibm-5.4
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Ubuntu:Pro:18.04:LTS linux-kvm
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Ubuntu:18.04:LTS linux-oem
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Ubuntu:Pro:18.04:LTS linux-oracle
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Ubuntu:18.04:LTS linux-oracle-5.0
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Ubuntu:18.04:LTS linux-oracle-5.3
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Ubuntu:Pro:18.04:LTS linux-oracle-5.4
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Ubuntu:Pro:18.04:LTS linux-raspi-5.4
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Ubuntu:Pro:FIPS-updates:18.04:LTS linux-aws-fips
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Ubuntu:Pro:FIPS-updates:18.04:LTS linux-azure-fips
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Ubuntu:Pro:FIPS-updates:18.04:LTS linux-fips
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Ubuntu:Pro:FIPS-updates:18.04:LTS linux-gcp-fips
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Ubuntu:Pro:FIPS:18.04:LTS linux-aws-fips
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Ubuntu:Pro:FIPS:18.04:LTS linux-azure-fips
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Ubuntu:Pro:FIPS:18.04:LTS linux-fips
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Ubuntu:Pro:FIPS:18.04:LTS linux-gcp-fips
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Ubuntu:Pro:20.04:LTS linux
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Ubuntu:Pro:20.04:LTS linux-aws
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Ubuntu:20.04:LTS linux-aws-5.11
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Ubuntu:20.04:LTS linux-aws-5.13
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Ubuntu:Pro:20.04:LTS linux-aws-5.15
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Ubuntu:20.04:LTS linux-aws-5.8
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Ubuntu:Pro:20.04:LTS linux-azure
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Ubuntu:20.04:LTS linux-azure-5.11
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Ubuntu:20.04:LTS linux-azure-5.13
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Ubuntu:Pro:20.04:LTS linux-azure-5.15
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Ubuntu:20.04:LTS linux-azure-5.8
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Ubuntu:20.04:LTS linux-azure-fde
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Ubuntu:Pro:20.04:LTS linux-azure-fde-5.15
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Ubuntu:Pro:20.04:LTS linux-bluefield
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Ubuntu:Pro:20.04:LTS linux-gcp
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Ubuntu:20.04:LTS linux-gcp-5.11
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Ubuntu:20.04:LTS linux-gcp-5.13
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Ubuntu:Pro:20.04:LTS linux-gcp-5.15
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Ubuntu:20.04:LTS linux-gcp-5.8
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Ubuntu:20.04:LTS linux-gke
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Ubuntu:20.04:LTS linux-gke-5.15
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Ubuntu:20.04:LTS linux-gkeop
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Ubuntu:20.04:LTS linux-gkeop-5.15
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Ubuntu:20.04:LTS linux-hwe-5.11
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Ubuntu:20.04:LTS linux-hwe-5.13
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Ubuntu:Pro:20.04:LTS linux-hwe-5.15
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Ubuntu:20.04:LTS linux-hwe-5.8
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Ubuntu:Pro:20.04:LTS linux-ibm
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Ubuntu:Pro:20.04:LTS linux-ibm-5.15
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Ubuntu:20.04:LTS linux-intel-5.13
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Ubuntu:Pro:20.04:LTS linux-intel-iotg-5.15
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Ubuntu:Pro:20.04:LTS linux-iot
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Ubuntu:Pro:20.04:LTS linux-kvm
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Ubuntu:Pro:20.04:LTS linux-lowlatency-hwe-5.15
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Ubuntu:Pro:20.04:LTS linux-nvidia-tegra-5.15
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Ubuntu:20.04:LTS linux-oem-5.10
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Ubuntu:20.04:LTS linux-oem-5.13
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Ubuntu:20.04:LTS linux-oem-5.14
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Ubuntu:20.04:LTS linux-oem-5.6
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Ubuntu:Pro:20.04:LTS linux-oracle
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Ubuntu:20.04:LTS linux-oracle-5.11
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Ubuntu:20.04:LTS linux-oracle-5.13
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Ubuntu:Pro:20.04:LTS linux-oracle-5.15
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Ubuntu:20.04:LTS linux-oracle-5.8
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Ubuntu:Pro:20.04:LTS linux-raspi
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Ubuntu:20.04:LTS linux-raspi2
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Ubuntu:20.04:LTS linux-riscv
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Ubuntu:20.04:LTS linux-riscv-5.11
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Ubuntu:Pro:20.04:LTS linux-riscv-5.15
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Ubuntu:20.04:LTS linux-riscv-5.8
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Ubuntu:Pro:20.04:LTS linux-xilinx-zynqmp
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Ubuntu:Pro:FIPS-updates:20.04:LTS linux-aws-fips
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Ubuntu:Pro:FIPS-updates:20.04:LTS linux-azure-fips
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Ubuntu:Pro:FIPS-updates:20.04:LTS linux-fips
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Ubuntu:Pro:FIPS-updates:20.04:LTS linux-gcp-fips
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Ubuntu:Pro:FIPS:20.04:LTS linux-aws-fips
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Ubuntu:Pro:FIPS:20.04:LTS linux-azure-fips
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Ubuntu:Pro:FIPS:20.04:LTS linux-fips
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Ubuntu:Pro:FIPS:20.04:LTS linux-gcp-fips
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Ubuntu:22.04:LTS linux
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Ubuntu:22.04:LTS linux-allwinner-5.19
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Ubuntu:22.04:LTS linux-aws
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Ubuntu:22.04:LTS linux-aws-5.19
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Ubuntu:22.04:LTS linux-aws-6.2
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Ubuntu:22.04:LTS linux-aws-6.5
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Ubuntu:22.04:LTS linux-azure
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Ubuntu:22.04:LTS linux-azure-5.19
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Ubuntu:22.04:LTS linux-azure-6.2
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Ubuntu:22.04:LTS linux-azure-6.5
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Ubuntu:22.04:LTS linux-azure-fde
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Ubuntu:22.04:LTS linux-azure-fde-5.19
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Ubuntu:22.04:LTS linux-azure-fde-6.2
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Ubuntu:22.04:LTS linux-gcp
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Ubuntu:22.04:LTS linux-gcp-5.19
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Ubuntu:22.04:LTS linux-gcp-6.2
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Ubuntu:22.04:LTS linux-gcp-6.5
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Ubuntu:22.04:LTS linux-gke
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Ubuntu:22.04:LTS linux-gkeop
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Ubuntu:22.04:LTS linux-hwe-5.19
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Ubuntu:22.04:LTS linux-hwe-6.2
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Ubuntu:22.04:LTS linux-hwe-6.5
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Ubuntu:22.04:LTS linux-ibm
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Ubuntu:22.04:LTS linux-intel-iot-realtime
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Ubuntu:22.04:LTS linux-intel-iotg
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Ubuntu:22.04:LTS linux-kvm
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Ubuntu:22.04:LTS linux-lowlatency
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Ubuntu:22.04:LTS linux-lowlatency-hwe-5.19
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Ubuntu:22.04:LTS linux-lowlatency-hwe-6.2
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Ubuntu:22.04:LTS linux-lowlatency-hwe-6.5
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Ubuntu:22.04:LTS linux-nvidia
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Ubuntu:22.04:LTS linux-nvidia-6.2
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Ubuntu:22.04:LTS linux-nvidia-6.5
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Ubuntu:22.04:LTS linux-nvidia-tegra
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Ubuntu:22.04:LTS linux-nvidia-tegra-igx
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Ubuntu:22.04:LTS linux-oem-5.17
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Ubuntu:22.04:LTS linux-oem-6.0
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Ubuntu:22.04:LTS linux-oem-6.1
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Ubuntu:22.04:LTS linux-oem-6.5
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Ubuntu:22.04:LTS linux-oracle
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Ubuntu:22.04:LTS linux-oracle-6.5
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Ubuntu:22.04:LTS linux-raspi
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Ubuntu:22.04:LTS linux-realtime
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Ubuntu:22.04:LTS linux-riscv
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Ubuntu:22.04:LTS linux-riscv-5.19
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Ubuntu:22.04:LTS linux-riscv-6.5
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Ubuntu:22.04:LTS linux-starfive-5.19
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Ubuntu:22.04:LTS linux-starfive-6.2
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Ubuntu:22.04:LTS linux-starfive-6.5
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Ubuntu:22.04:LTS linux-xilinx-zynqmp
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Ubuntu:Nvidia-BlueField:22.04:LTS linux-bluefield
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Ubuntu:Pro:FIPS-preview:22.04:LTS linux-aws-fips
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Ubuntu:Pro:FIPS-preview:22.04:LTS linux-azure-fips
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Ubuntu:Pro:FIPS-preview:22.04:LTS linux-fips
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Ubuntu:Pro:FIPS-preview:22.04:LTS linux-gcp-fips
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:22.04:LTS linux-aws-fips
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:22.04:LTS linux-azure-fips
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:22.04:LTS linux-fips
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:22.04:LTS linux-gcp-fips
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:Realtime:22.04:LTS linux-intel-iot-realtime
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:Realtime:22.04:LTS linux-realtime
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-azure-6.11
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-gcp-6.11
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-hwe-6.11
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-intel
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-lowlatency-hwe-6.11
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-oem-6.11
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-oem-6.8
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-raspi-realtime
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-realtime
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS linux-riscv
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04 linux-nvidia
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Nvidia-BlueField:24.04:LTS linux-bluefield
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

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