CVE-2026-64051 accel/qaic: Add overflow check to remap_pfn_range during mmap
A missing overflow check in the Linux kernel's QAIAC driver allows use-after-free conditions, potentially enabling local attackers to execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64051?
CVE-2026-64051 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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]
Weakness: CWE-416
Which versions are affected by CVE-2026-64051?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64051?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-64051 being exploited?
There is no known exploitation of CVE-2026-64051 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64051, DEBIAN-CVE-2026-64051, GHSA-26m7-cqmr-vwvj, UBUNTU-CVE-2026-64051.