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    <link>https://cve.radiocsirt.org</link>
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    <lastBuildDate>Fri, 09 Oct 2026 02:43:14 +0000</lastBuildDate>
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      <title>CVE-2022-49698 — netfilter: use get_random_u32 instead of prandom</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2022-49698</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;netfilter: use get_random_u32 instead of prandom&lt;/p&gt;
&lt;p&gt;bh might occur while updating per-cpu rnd_state from user context,
ie. local_out path.&lt;/p&gt;
&lt;p&gt;BUG: using smp_processor_id() in preemptible [00000000] code: nginx/2725
caller is nft_ng_random_eval+0x24/0x54 [nft_numgen]
Call Trace:
 check_preemption_disabled+0xde/0xe0
 nft_ng_random_eval+0x24/0x54 [nft_numgen]&lt;/p&gt;
&lt;p&gt;Use the random driver instead, this also avoids need for local prandom
state. Moreover, prandom now uses the random driver since d4150779e60f
(&amp;#34;random32: use real rng for non-deterministic randomness&amp;#34;).&lt;/p&gt;
&lt;p&gt;Based on earlier patch from Pablo Neira.&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;netfilter: use get_random_u32 instead of prandom&lt;/p&gt;
&lt;p&gt;bh might occur while updating per-cpu rnd_state from user context,
ie. local_out path.&lt;/p&gt;
&lt;p&gt;BUG: using smp_processor_id() in preemptible [00000000] code: nginx/2725
caller is nft_ng_random_eval+0x24/0x54 [nft_numgen]
Call Trace:
 check_preemption_disabled+0xde/0xe0
 nft_ng_random_eval+0x24/0x54 [nft_numgen]&lt;/p&gt;
&lt;p&gt;Use the random driver instead, this also avoids need for local prandom
state. Moreover, prandom now uses the random driver since d4150779e60f
(&amp;#34;random32: use real rng for non-deterministic randomness&amp;#34;).&lt;/p&gt;
&lt;p&gt;Based on earlier patch from Pablo Neira.&lt;/p&gt;</content:encoded>
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