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      <title>CVE-2022-48643 — netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain()</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2022-48643</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: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain()&lt;/p&gt;
&lt;p&gt;syzbot is reporting underflow of nft_counters_enabled counter at
nf_tables_addchain() [1], for commit 43eb8949cfdffa76 (&amp;#34;netfilter:
nf_tables: do not leave chain stats enabled on error&amp;#34;) missed that
nf_tables_chain_destroy() after nft_basechain_init() in the error path of
nf_tables_addchain() decrements the counter because nft_basechain_init()
makes nft_is_base_chain() return true by setting NFT_CHAIN_BASE flag.&lt;/p&gt;
&lt;p&gt;Increment the counter immediately after returning from
nft_basechain_init().&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: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain()&lt;/p&gt;
&lt;p&gt;syzbot is reporting underflow of nft_counters_enabled counter at
nf_tables_addchain() [1], for commit 43eb8949cfdffa76 (&amp;#34;netfilter:
nf_tables: do not leave chain stats enabled on error&amp;#34;) missed that
nf_tables_chain_destroy() after nft_basechain_init() in the error path of
nf_tables_addchain() decrements the counter because nft_basechain_init()
makes nft_is_base_chain() return true by setting NFT_CHAIN_BASE flag.&lt;/p&gt;
&lt;p&gt;Increment the counter immediately after returning from
nft_basechain_init().&lt;/p&gt;</content:encoded>
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