CVE-2026-80867
Received Received - Intake

PCI Memory Mapping Bypass in Linux Kernel Alpha PCI

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: kernel.org

Description
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().

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-05
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-80867
EUVD
EUVD-2026-71497

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel affects Alpha PCI systems. The pci_mmap_resource() function allows userspace to map PCI BARs (memory regions) without checking if the kernel is in a locked-down state. This could enable DMA attacks if the kernel is locked down for security reasons.

Detection Guidance

This vulnerability involves missing security checks in the Linux kernel's PCI memory mapping for Alpha systems. Detection requires checking kernel version and configuration. Use uname -a to verify kernel version and grep CONFIG_LOCK_DOWN_KERNEL /boot/config-$(uname -r) to confirm lockdown support.

Impact Analysis

If exploited, this vulnerability could allow an attacker with local access to perform DMA attacks, potentially reading or writing to system memory. This could lead to privilege escalation or data theft, depending on the system configuration.

Mitigation Strategies

Immediate mitigation requires updating the Linux kernel to a patched version that includes the security_locked_down() check for Alpha PCI mmap. Apply vendor security updates or compile a kernel with the fix from the referenced commit eb627e17727e.

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