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    <lastBuildDate>Wed, 30 Sep 2026 01:26:41 +0000</lastBuildDate>
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      <title>CVE-2024-40901 — scsi: mpt3sas: Avoid test/set_bit() operating in non-allocated memory</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2024-40901</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;scsi: mpt3sas: Avoid test/set_bit() operating in non-allocated memory&lt;/p&gt;
&lt;p&gt;There is a potential out-of-bounds access when using test_bit() on a single
word. The test_bit() and set_bit() functions operate on long values, and
when testing or setting a single word, they can exceed the word
boundary. KASAN detects this issue and produces a dump:&lt;/p&gt;
&lt;p&gt;BUG: KASAN: slab-out-of-bounds in _scsih_add_device.constprop.0 (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 drivers/scsi/mpt3sas/mpt3sas_scsih.c:7331) mpt3sas&lt;/p&gt;
&lt;p&gt;Write of size 8 at addr ffff8881d26e3c60 by task kworker/u1536:2/2965&lt;/p&gt;
&lt;p&gt;For full log, please look at [1].&lt;/p&gt;
&lt;p&gt;Make the allocation at least the size of sizeof(unsigned long) so that
set_bit() and test_bit() have sufficient room for read/write operations
without overwriting unallocated memory.&lt;/p&gt;
&lt;p&gt;[1] Link: https://lore.kernel.org/all/ZkNcALr3W3KGYYJG@gmail.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;scsi: mpt3sas: Avoid test/set_bit() operating in non-allocated memory&lt;/p&gt;
&lt;p&gt;There is a potential out-of-bounds access when using test_bit() on a single
word. The test_bit() and set_bit() functions operate on long values, and
when testing or setting a single word, they can exceed the word
boundary. KASAN detects this issue and produces a dump:&lt;/p&gt;
&lt;p&gt;BUG: KASAN: slab-out-of-bounds in _scsih_add_device.constprop.0 (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 drivers/scsi/mpt3sas/mpt3sas_scsih.c:7331) mpt3sas&lt;/p&gt;
&lt;p&gt;Write of size 8 at addr ffff8881d26e3c60 by task kworker/u1536:2/2965&lt;/p&gt;
&lt;p&gt;For full log, please look at [1].&lt;/p&gt;
&lt;p&gt;Make the allocation at least the size of sizeof(unsigned long) so that
set_bit() and test_bit() have sufficient room for read/write operations
without overwriting unallocated memory.&lt;/p&gt;
&lt;p&gt;[1] Link: https://lore.kernel.org/all/ZkNcALr3W3KGYYJG@gmail.com/&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://vulnerability.circl.lu/vuln/cve-2024-40901</guid>
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