{"id":"CVE-2026-46280","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nlib: test_hmm: evict device pages on file close to avoid use-after-free\n\nPatch series \"Minor hmm_test fixes and cleanups\".\n\nTwo bugfixes a cleanup for the HMM kernel se…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nlib: test_hmm: evict device pages on file close to avoid use-after-free\n\nPatch series \"Minor hmm_test fixes and cleanups\".\n\nTwo bugfixes a cleanup for the HMM kernel se…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","published":"2026-06-08","updated":"2026-07-07","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46280","references":[{"url":"https://git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bf477abd448c76bb8ea51c9b4f63a3a17c4b6239","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00126,"epssPercentile":0.02589,"ingestedAt":"2026-07-07T18:42:24.269Z","slug":"CVE-2026-46280","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nlib: test_hmm: evict device pages on file close to avoid use-after-free\n\nPatch series \"Minor hmm_test fixes and cleanups\".\n\nTwo bugfixes a cleanup for the HMM kernel selftests.  These were mostly\nreported by Zenghui Yu with special thanks to Lorenzo for analysing and\npointing out the problems.\n\n\nThis patch (of 3):\n\nWhen dmirror_fops_release() is called it frees the dmirror struct but\ndoesn't migrate device private pages back to system memory first.  This\nleaves those pages with a dangling zone_device_data pointer to the freed\ndmirror.\n\nIf a subsequent fault occurs on those pages (eg.  during coredump) the\ndmirror_devmem_fault() callback dereferences the stale pointer causing a\nkernel panic.  This was reported [1] when running mm/ksft_hmm.sh on arm64,\nwhere a test failure triggered SIGABRT and the resulting coredump walked\nthe VMAs faulting in the stale device private pages.\n\nFix this by calling dmirror_device_evict_chunk() for each devmem chunk in\ndmirror_fops_release() to migrate all device private pages back to system\nmemory before freeing the dmirror struct.  The function is moved earlier\nin the file to avoid a forward declaration.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}