CVE-2026-80867

In the Linux kernel, the following vulnerability has been resolved:

alpha/PCI: Add security locked down() check to pci mmap resource()

Currently, Alpha's pci mmap resource() does not check security locked down(LOCKDOWN PCI ACCESS) before allowing userspace to mmap PCI BARs.

The generic version has had this check since commit eb627e17727e ("PCI: Lock down BAR access when the kernel is locked down") to prevent DMA attacks when the kernel is locked down.

Add the same check to Alpha's pci mmap resource().