https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Sun, 04 Oct 2026 16:12:40 +0000 https://vulnerability.circl.lu/vuln/cve-2025-38066 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>dm cache: prevent BUG_ON by blocking retries on failed device resumes</p> <p>A cache device failing to resume due to mapping errors should not be retried, as the failure leaves a partially initialized policy object. Repeating the resume operation risks triggering BUG_ON when reloading cache mappings into the incomplete policy object.</p> <p>Reproduce steps:</p> <p>1. create a cache metadata consisting of 512 or more cache blocks, with some mappings stored in the first array block of the mapping array. Here we use cache_restore v1.0 to build the metadata.</p> <p>cat &lt;&lt;EOF &gt;&gt; cmeta.xml &lt;superblock uuid=&#34;&#34; block_size=&#34;128&#34; nr_cache_blocks=&#34;512&#34; \ policy=&#34;smq&#34; hint_width=&#34;4&#34;&gt; &lt;mappings&gt; &lt;mapping cache_block=&#34;0&#34; origin_block=&#34;0&#34; dirty=&#34;false&#34;/&gt; &lt;/mappings&gt; &lt;/superblock&gt; EOF dmsetup create cmeta --table &#34;0 8192 linear /dev/sdc 0&#34; cache_restore -i cmeta.xml -o /dev/mapper/cmeta --metadata-version=2 dmsetup remove cmeta</p> <p>2. wipe the second array block of the mapping array to simulate data degradations.</p> <p>mapping_root=$(dd if=/dev/sdc bs=1c count=8 skip=192 \ 2&gt;/dev/null | hexdump -e &#39;1/8 &#34;%u\n&#34;&#39;) ablock=$(dd if=/dev/sdc bs=1c count=8 skip=$((4096*mapping_root+2056)) \ 2&gt;/dev/null | hexdump -e &#39;1/8 &#34;%u\n&#34;&#39;) dd if=/dev/zero of=/dev/sdc bs=4k count=1 seek=$ablock</p> <p>3. try bringing up the cache device. The resume is expected to fail due to the broken array block.</p> <p>dmsetup create cmeta --table &#34;0 8192 linear /dev/sdc 0&#34; dmset…</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>dm cache: prevent BUG_ON by blocking retries on failed device resumes</p> <p>A cache device failing to resume due to mapping errors should not be retried, as the failure leaves a partially initialized policy object. Repeating the resume operation risks triggering BUG_ON when reloading cache mappings into the incomplete policy object.</p> <p>Reproduce steps:</p> <p>1. create a cache metadata consisting of 512 or more cache blocks, with some mappings stored in the first array block of the mapping array. Here we use cache_restore v1.0 to build the metadata.</p> <p>cat &lt;&lt;EOF &gt;&gt; cmeta.xml &lt;superblock uuid=&#34;&#34; block_size=&#34;128&#34; nr_cache_blocks=&#34;512&#34; \ policy=&#34;smq&#34; hint_width=&#34;4&#34;&gt; &lt;mappings&gt; &lt;mapping cache_block=&#34;0&#34; origin_block=&#34;0&#34; dirty=&#34;false&#34;/&gt; &lt;/mappings&gt; &lt;/superblock&gt; EOF dmsetup create cmeta --table &#34;0 8192 linear /dev/sdc 0&#34; cache_restore -i cmeta.xml -o /dev/mapper/cmeta --metadata-version=2 dmsetup remove cmeta</p> <p>2. wipe the second array block of the mapping array to simulate data degradations.</p> <p>mapping_root=$(dd if=/dev/sdc bs=1c count=8 skip=192 \ 2&gt;/dev/null | hexdump -e &#39;1/8 &#34;%u\n&#34;&#39;) ablock=$(dd if=/dev/sdc bs=1c count=8 skip=$((4096*mapping_root+2056)) \ 2&gt;/dev/null | hexdump -e &#39;1/8 &#34;%u\n&#34;&#39;) dd if=/dev/zero of=/dev/sdc bs=4k count=1 seek=$ablock</p> <p>3. try bringing up the cache device. The resume is expected to fail due to the broken array block.</p> <p>dmsetup create cmeta --table &#34;0 8192 linear /dev/sdc 0&#34; dmset…</p> https://vulnerability.circl.lu/vuln/cve-2025-38066