High [CVE-2026-64051] Add overflow check to remap_pfn_range during mmap

In the Linux kernel, the following vulnerability has been resolved: accel/qaic: Add overflow check to remap_pfn_range during mmap The call to remap_pfn_range in qaic_gem_object_mmap is susceptible to (re)mapping beyond the VMA if the BO is too large.

This can cause use after free issues when munmap() unmaps only the VMA region and not the additional mappings.

To prevent this, check the remaining size of the VMA before remapping and truncate the remapped length if sg->length is too large. [jhugo: fix braces from checkpatch --strict] This vulnerability allows for memory to be mapped beyond its intended boundaries during certain memory allocation operations.

A local attacker could exploit this flaw, leading to a use-after-free condition. This could potentially result in privilege escalation or a denial of service.

This vulnerability is rated as an Important impact for Red Hat Enterprise Linux because an authenticated local user with access to the accelerator device node could trigger a use-after-free condition to escalate privileges or crash the host. The flaw is confined to the `qaic` device driver supporting Qualcomm Cloud AI 100 PCIe acceleration hardware.

Installations lacking this specialized hardware or where the driver module is uninitialized and inaccessible are not exposed to this risk.