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    <lastBuildDate>Wed, 30 Sep 2026 10:45:11 +0000</lastBuildDate>
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      <title>CVE-2026-34177 — VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-34177</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Canonical lxd&lt;/p&gt;
&lt;p&gt;Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual-machines.lowlevel=block project restriction. A remote attacker with can_edit permission on a VM instance in a restricted project can inject an AppArmor rule and a QEMU chardev configuration that bridges the LXD Unix socket into the guest VM, enabling privilege escalation to LXD cluster administrator and subsequently to host root.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Canonical lxd&lt;/p&gt;
&lt;p&gt;Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual-machines.lowlevel=block project restriction. A remote attacker with can_edit permission on a VM instance in a restricted project can inject an AppArmor rule and a QEMU chardev configuration that bridges the LXD Unix socket into the guest VM, enabling privilege escalation to LXD cluster administrator and subsequently to host root.&lt;/p&gt;</content:encoded>
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