CVE-2026-68423 mtd: virt_concat: fix use-after-free in mtd_virt_concat_destroy()
A use-after-free in the Linux kernel's MTD virtual concatenation driver allows local attackers to execute arbitrary code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68423?
CVE-2026-68423 is an use after free vulnerability in Linux, published on 10 Aug 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:
mtd: virt_concat: fix use-after-free in mtd_virt_concat_destroy()
mtd_concat_destroy() frees item->concat so calling mtd_virt_concat_put_mtd_devices(item->concat) after that leads to a use-after-free.
Fix it by moving mtd_virt_concat_put_mtd_devices() before mtd_concat_destroy().
Which versions are affected by CVE-2026-68423?
How do I fix CVE-2026-68423?
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-2026-68423 being exploited?
There is no known exploitation of CVE-2026-68423 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-68423, GHSA-8hqq-jf47-jqrx, UBUNTU-CVE-2026-68423.