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    <title>Most recent entries from all</title>
    <link>https://vulnerability.circl.lu</link>
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      <title>CVE-2025-39990 — bpf: Check the helper function is valid in get_helper_proto</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2025-39990</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;bpf: Check the helper function is valid in get_helper_proto&lt;/p&gt;
&lt;p&gt;kernel test robot reported verifier bug [1] where the helper func
pointer could be NULL due to disabled config option.&lt;/p&gt;
&lt;p&gt;As Alexei suggested we could check on that in get_helper_proto
directly. Marking tail_call helper func with BPF_PTR_POISON,
because it is unused by design.&lt;/p&gt;
&lt;p&gt;[1] https://lore.kernel.org/oe-lkp/202507160818.68358831-lkp@intel.com&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;bpf: Check the helper function is valid in get_helper_proto&lt;/p&gt;
&lt;p&gt;kernel test robot reported verifier bug [1] where the helper func
pointer could be NULL due to disabled config option.&lt;/p&gt;
&lt;p&gt;As Alexei suggested we could check on that in get_helper_proto
directly. Marking tail_call helper func with BPF_PTR_POISON,
because it is unused by design.&lt;/p&gt;
&lt;p&gt;[1] https://lore.kernel.org/oe-lkp/202507160818.68358831-lkp@intel.com&lt;/p&gt;</content:encoded>
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