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      <title>CVE-2025-31133 — runc container escape via "masked path" abuse due to mount race conditions</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2025-31133</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; opencontainers runc&lt;/p&gt;
&lt;p&gt;runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, 1.4.0-rc.1 and 1.4.0-rc.2 files, runc would not perform sufficient verification that the source of the bind-mount (i.e., the container&amp;#39;s /dev/null) was actually a real /dev/null inode when using the container&amp;#39;s /dev/null to mask. This exposes two methods of attack:  an arbitrary mount gadget, leading to host information disclosure, host denial of service, container escape, or a bypassing of maskedPaths. This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; opencontainers runc&lt;/p&gt;
&lt;p&gt;runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, 1.4.0-rc.1 and 1.4.0-rc.2 files, runc would not perform sufficient verification that the source of the bind-mount (i.e., the container&amp;#39;s /dev/null) was actually a real /dev/null inode when using the container&amp;#39;s /dev/null to mask. This exposes two methods of attack:  an arbitrary mount gadget, leading to host information disclosure, host denial of service, container escape, or a bypassing of maskedPaths. This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.&lt;/p&gt;</content:encoded>
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