CVE-2026-80686

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux6c287605fd56466e645693eff3ae7c08fba56e0a < 26f9ca8ed42cba25d2c75daff13561cce6019395affected
LinuxLinux6c287605fd56466e645693eff3ae7c08fba56e0a < 5b948706f11a950bc73c5304630d0a7eafc40dafaffected
LinuxLinux6c287605fd56466e645693eff3ae7c08fba56e0a < 86d55447de3738620b9a8272ff167ce97e7f7203affected
LinuxLinux6c287605fd56466e645693eff3ae7c08fba56e0a < 2be94d6b20789b8865b1864dae5fe458ca85e019affected
LinuxLinux6c287605fd56466e645693eff3ae7c08fba56e0a < 42f30fa5481a1f90571ccdfbb20d2e25e47ae76eaffected
LinuxLinux6c287605fd56466e645693eff3ae7c08fba56e0a < 63867c82d0c0c2d182016a32b1cc0103116b0ea5affected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux6.1.184 <= 6.1.*unaffected
LinuxLinux6.6.153 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References