https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Thu, 01 Oct 2026 22:08:41 +0000 https://vulnerability.circl.lu/vuln/cve-2026-46280 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>lib: test_hmm: evict device pages on file close to avoid use-after-free</p> <p>Patch series &#34;Minor hmm_test fixes and cleanups&#34;.</p> <p>Two bugfixes a cleanup for the HMM kernel selftests. These were mostly reported by Zenghui Yu with special thanks to Lorenzo for analysing and pointing out the problems.</p> <p>This patch (of 3):</p> <p>When dmirror_fops_release() is called it frees the dmirror struct but doesn&#39;t migrate device private pages back to system memory first. This leaves those pages with a dangling zone_device_data pointer to the freed dmirror.</p> <p>If a subsequent fault occurs on those pages (eg. during coredump) the dmirror_devmem_fault() callback dereferences the stale pointer causing a kernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64, where a test failure triggered SIGABRT and the resulting coredump walked the VMAs faulting in the stale device private pages.</p> <p>Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in dmirror_fops_release() to migrate all device private pages back to system memory before freeing the dmirror struct. The function is moved earlier in the file to avoid a forward declaration.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>lib: test_hmm: evict device pages on file close to avoid use-after-free</p> <p>Patch series &#34;Minor hmm_test fixes and cleanups&#34;.</p> <p>Two bugfixes a cleanup for the HMM kernel selftests. These were mostly reported by Zenghui Yu with special thanks to Lorenzo for analysing and pointing out the problems.</p> <p>This patch (of 3):</p> <p>When dmirror_fops_release() is called it frees the dmirror struct but doesn&#39;t migrate device private pages back to system memory first. This leaves those pages with a dangling zone_device_data pointer to the freed dmirror.</p> <p>If a subsequent fault occurs on those pages (eg. during coredump) the dmirror_devmem_fault() callback dereferences the stale pointer causing a kernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64, where a test failure triggered SIGABRT and the resulting coredump walked the VMAs faulting in the stale device private pages.</p> <p>Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in dmirror_fops_release() to migrate all device private pages back to system memory before freeing the dmirror struct. The function is moved earlier in the file to avoid a forward declaration.</p> https://vulnerability.circl.lu/vuln/cve-2026-46280