CVE-2026-46277 mm/zone_device: do not touch device folio after calling ->folio_free()
A use-after-free in the Linux kernel memory management allows attackers to potentially execute code or escalate privileges by exploiting device folio handling.
- 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-2026-46277?
CVE-2026-46277 is a high-severity use after free vulnerability in Linux kernel, published on 8 Jun 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:
mm/zone_device: do not touch device folio after calling ->folio_free()
The contents of a device folio can immediately change after calling ->folio_free(), as the folio may be reallocated by a driver with a different order. Instead of touching the folio again to extract the pgmap, use the local stack variable when calling percpu_ref_put_many().
Which versions are affected by CVE-2026-46277?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46277?
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-2026-46277 being exploited?
There is no known exploitation of CVE-2026-46277 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-46277, GHSA-jqww-wr6j-993j, UBUNTU-CVE-2026-46277.