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    <link>https://vulnerability.circl.lu</link>
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    <lastBuildDate>Wed, 30 Sep 2026 23:24:56 +0000</lastBuildDate>
    <item>
      <title>CVE-2025-21874 — dm-integrity: Avoid divide by zero in table status in Inline mode</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2025-21874</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;dm-integrity: Avoid divide by zero in table status in Inline mode&lt;/p&gt;
&lt;p&gt;In Inline mode, the journal is unused, and journal_sectors is zero.&lt;/p&gt;
&lt;p&gt;Calculating the journal watermark requires dividing by journal_sectors,
which should be done only if the journal is configured.&lt;/p&gt;
&lt;p&gt;Otherwise, a simple table query (dmsetup table) can cause OOPS.&lt;/p&gt;
&lt;p&gt;This bug did not show on some systems, perhaps only due to
compiler optimization.&lt;/p&gt;
&lt;p&gt;On my 32-bit testing machine, this reliably crashes with the following:&lt;/p&gt;
&lt;p&gt;: Oops: divide error: 0000 [#1] PREEMPT SMP
 : CPU: 0 UID: 0 PID: 2450 Comm: dmsetup Not tainted 6.14.0-rc2+ #959
 : EIP: dm_integrity_status+0x2f8/0xab0 [dm_integrity]
 ...&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;dm-integrity: Avoid divide by zero in table status in Inline mode&lt;/p&gt;
&lt;p&gt;In Inline mode, the journal is unused, and journal_sectors is zero.&lt;/p&gt;
&lt;p&gt;Calculating the journal watermark requires dividing by journal_sectors,
which should be done only if the journal is configured.&lt;/p&gt;
&lt;p&gt;Otherwise, a simple table query (dmsetup table) can cause OOPS.&lt;/p&gt;
&lt;p&gt;This bug did not show on some systems, perhaps only due to
compiler optimization.&lt;/p&gt;
&lt;p&gt;On my 32-bit testing machine, this reliably crashes with the following:&lt;/p&gt;
&lt;p&gt;: Oops: divide error: 0000 [#1] PREEMPT SMP
 : CPU: 0 UID: 0 PID: 2450 Comm: dmsetup Not tainted 6.14.0-rc2+ #959
 : EIP: dm_integrity_status+0x2f8/0xab0 [dm_integrity]
 ...&lt;/p&gt;</content:encoded>
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