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    <link>https://vulnerability.circl.lu</link>
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    <lastBuildDate>Mon, 28 Sep 2026 10:54:49 +0000</lastBuildDate>
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      <title>CVE-2026-64522 — net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-64522</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;net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA&lt;/p&gt;
&lt;p&gt;mlx5e_xfrm_add_state() handles acquire-flow temporary SAs by allocating
software state and skipping hardware offload setup.&lt;/p&gt;
&lt;p&gt;That path jumps to the common success label before taking the eswitch mode
block. After tunnel-mode validation was moved earlier, the common success
label unconditionally calls mlx5_eswitch_unblock_mode(). For acquire SAs,
this decrements esw-&amp;gt;offloads.num_block_mode without a matching increment.&lt;/p&gt;
&lt;p&gt;Return directly after installing the acquire SA offload handle, so only the
paths that successfully called mlx5_eswitch_block_mode() call the matching
unblock.&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;net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA&lt;/p&gt;
&lt;p&gt;mlx5e_xfrm_add_state() handles acquire-flow temporary SAs by allocating
software state and skipping hardware offload setup.&lt;/p&gt;
&lt;p&gt;That path jumps to the common success label before taking the eswitch mode
block. After tunnel-mode validation was moved earlier, the common success
label unconditionally calls mlx5_eswitch_unblock_mode(). For acquire SAs,
this decrements esw-&amp;gt;offloads.num_block_mode without a matching increment.&lt;/p&gt;
&lt;p&gt;Return directly after installing the acquire SA offload handle, so only the
paths that successfully called mlx5_eswitch_block_mode() call the matching
unblock.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://vulnerability.circl.lu/vuln/cve-2026-64522</guid>
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