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    <lastBuildDate>Mon, 05 Oct 2026 02:19:16 +0000</lastBuildDate>
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      <title>CVE-2026-49421 — unlinkat(2) ignores AT_RESOLVE_BENEATH flag</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-49421</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; FreeBSD&lt;/p&gt;
&lt;p&gt;The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup.  The flag was silently dropped, so path resolution was not actually restricted.&lt;/p&gt;
&lt;p&gt;A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory.  A caller relying on this flag for path containment may delete files outside the intended directory tree.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; FreeBSD&lt;/p&gt;
&lt;p&gt;The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup.  The flag was silently dropped, so path resolution was not actually restricted.&lt;/p&gt;
&lt;p&gt;A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory.  A caller relying on this flag for path containment may delete files outside the intended directory tree.&lt;/p&gt;</content:encoded>
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