CVE-2026-89967
HighCVSS 7.8Summary
In the Linux kernel, migrate_device_range() and migrate_device_pfns() clear entries following a compound folio without limiting them to the number of slots remaining in the npages-sized array. If a compound folio extends beyond the end of the caller-provided range, the loops cause an out-of-bounds write.
Risk Assessment
This can lead to kernel memory corruption and system panic during page migration to device memory. It affects systems using HMM and device memory migration.
Recommendation
Update the Linux kernel to a version containing the fix that stops processing a compound folio when its page-granular representation does not fit in the remaining PFN array. Avoid migrating anonymous huge pages to device memory until patched.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mm/migrate_device: avoid out-of-bounds writes for compound folios migrate_device_range() and migrate_device_pfns() clear the entries following a compound folio so that the PFN arrays retain their page-granular representation. If a compound folio extends beyond the end of the caller-provided range, the loops clear all following folio entries without limiting them to the number of slots remaining in the npages-sized array, causing an out-of-bounds write. Do not proceed with a compound folio if its page-granular representation does not fit entirely in the remaining PFN array. If this happens, drop any reference and lock acquired for the folio, clear the remaining entries, and stop collecting. Observed with a KASAN x86 QEMU kernel using the HMM migrate_anon_huge_zero selftest. Closing /dev/hmm_dmirror0 after migrating an anonymous huge page to device memory exercises: dmirror_fops_release() -> dmirror_device_evict_chunk() -> migrate_device_range()
Vulnerability data from NVD (NIST) · CISA KEV · EPSS