What’s Vulnerable › Vulnerabilities

CVE-2026-80686: mm: migrate_device: fix pte_pfn/pte_dirty called on non-present PTE

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-08-28

Description

In the Linux kernel, the following vulnerability has been resolved: mm: migrate_device: fix pte_pfn/pte_dirty called on non-present PTE pte_pfn() and pte_dirty() have undefined behaviour when called on a non-present PTE. In migrate_vma_collect_pmd(), these functions may be invoked on non-present entries (e.g., device-private entries), leading to potential crashes from pte_pfn() or incorrect dirty folio accounting from pte_dirty(). Fix both by guarding with pte_present() checks.

Affected products

• Linux kernel: 5.19 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/26f9ca8ed42cba25d2c75daff13561cce6019395
• https://git.kernel.org/stable/c/2be94d6b20789b8865b1864dae5fe458ca85e019
• https://git.kernel.org/stable/c/42f30fa5481a1f90571ccdfbb20d2e25e47ae76e
• https://git.kernel.org/stable/c/5b948706f11a950bc73c5304630d0a7eafc40daf
• https://git.kernel.org/stable/c/63867c82d0c0c2d182016a32b1cc0103116b0ea5
• https://git.kernel.org/stable/c/86d55447de3738620b9a8272ff167ce97e7f7203

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