Linux Kernel Vulnerability Affecting Device Management

CVE-2026-80686

What is CVE-2026-80686?

A vulnerability in the Linux kernel occurs when memory management functions pte_pfn() and pte_dirty() are incorrectly invoked on non-present page table entries (PTEs). This issue can lead to potential system crashes or erroneous dirty folio accounting, especially in contexts such as device-private entries. The vulnerability has been addressed with protective checks to ensure that these functions are only called when PTEs are confirmed as present, thereby stabilizing memory operations related to the management of device resources.

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